CN117977853A - Motor and vehicle - Google Patents

Abstract

The invention provides a motor and a vehicle. The motor is used for driving the hub and comprises a rotor assembly and a stator assembly, the rotor assembly is sleeved outside the stator assembly, and the rotor assembly comprises a plurality of iron core blocks and a plurality of permanent magnets; the plurality of iron core blocks are arranged along the circumferential direction; the plurality of permanent magnets are respectively arranged between adjacent iron core blocks in the plurality of iron core blocks, and each permanent magnet in the plurality of permanent magnets is arranged along the radial direction; wherein the axial length of the plurality of permanent magnets is greater than the axial length of the plurality of core blocks.

Description

Motor and vehicle

Technical Field

The invention relates to the technical field of motors, in particular to a motor and a vehicle.

Background

At present, the motor comprises a stator assembly and a rotor assembly, wherein the rotor assembly is sleeved outside the stator assembly, so that the motor can be used as an outer rotor motor. In the related art, a rotor assembly includes a permanent magnet and a stator core, and end effects are generated at the ends of the permanent magnet and the stator core in an axial direction, thereby resulting in a low output torque of the motor.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the invention proposes an electric machine.

A second aspect of the invention proposes a vehicle.

In view of this, a first aspect of the present invention provides an electric machine for driving a hub, the electric machine comprising a rotor assembly and a stator assembly, the rotor assembly being sleeved outside the stator assembly, the rotor assembly comprising a plurality of core blocks and a plurality of permanent magnets; the plurality of iron core blocks are arranged along the circumferential direction; the plurality of permanent magnets are respectively arranged between adjacent iron core blocks in the plurality of iron core blocks, and each permanent magnet in the plurality of permanent magnets is arranged along the radial direction; wherein the axial length of the plurality of permanent magnets is greater than the axial length of the plurality of core blocks.

The motor provided by the invention has the advantages that the rotor assembly comprises the iron core blocks and the permanent magnets, the iron core blocks are circumferentially arranged, the mounting grooves are formed between the adjacent iron core blocks in the iron core blocks, and the permanent magnets are respectively arranged in the mounting grooves between the adjacent iron core blocks in the iron core blocks, so that the stator assembly of the motor can drive the rotor assembly to rotate, and the power output is realized. The axial lengths of the plurality of permanent magnets and the axial lengths of the plurality of iron core blocks are adjusted, so that the end effect of the rotor assembly is adjusted; by setting the axial lengths of the plurality of permanent magnets to be greater than the axial lengths of the plurality of iron core blocks, the end effect of the rotor assembly is reduced, and the output torque of the motor is further improved.

Because the axial length of a plurality of permanent magnets is greater than the axial length of a plurality of iron core blocks, is equivalent to the axial length increase of the permanent magnets, and the axial length of the iron core blocks is unchanged, compared with a motor for increasing the integral axial length of a rotor assembly, the material cost required to be increased by the rotor assembly is smaller, and the material cost of the motor is reduced while the output torque of the motor is improved.

Because the axial length of the plurality of permanent magnets is set to be greater than the axial length of the plurality of iron core blocks, the end effect of the rotor assembly can be reduced, the simulation experiment result of the motor is closer to the actual working parameter of the motor, the output torque of the motor obtained by the simulation experiment is closer to the actual output torque of the motor, and further, the problem that the actual output torque of the motor is too small due to the fact that the output torque of the simulation experiment is far greater than the actual output torque of the motor is avoided, and the actual output torque of the motor is further improved.

The rotor assembly includes a plurality of core blocks and a plurality of permanent magnets, and the permanent magnets and the core blocks are alternately arranged at intervals to form an annular structure and an outer rotor. The permanent magnets and the iron core blocks are alternately arranged at intervals to form the annular outer rotor, and the permanent magnets are not required to be tile-shaped, so that the consumption of the iron core blocks can be reduced, the cost of the motor can be reduced, meanwhile, the size of the iron core blocks is not limited by the pole arc coefficient, and meanwhile, the magnetic focusing effect of the parallel magnetic circuit enables the torque density of the motor to be higher, so that the power of the motor can be improved under the same condition, and the torque output of the motor is ensured.

Further, a plurality of iron core blocks are arranged along the circumference to form a rotor core, the rotor core adopts a non-magnetic bridge structure, and the tangential thickness of the permanent magnet is preferably 3mm so as to reduce the demagnetizing risk of the permanent magnet. In order to reduce the end effect, the rotor core stack length is 25.9mm and the permanent magnet axial length is 26.9mm.

In addition, the rotor assembly in the technical scheme provided by the invention can also have the following additional technical characteristics:

In one technical scheme of the invention, the motor further comprises a stator assembly, the rotor assembly is sleeved outside the stator assembly, the stator assembly comprises a stator core and an aluminum winding, the stator core comprises a plurality of stator teeth, the plurality of stator teeth are circumferentially arranged, stator grooves are formed between adjacent stator teeth in the plurality of stator teeth, and the stator grooves extend along the radial direction. The aluminum winding is embedded in the stator slot.

In the technical scheme, the motor comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises an aluminum winding, excitation is formed after the aluminum winding is electrified, and the stator assembly interacts with the rotor assembly to enable the rotor assembly to operate; meanwhile, the stator core can be formed by axially laminating stator punching sheets. The aluminum winding is combined with the outer rotor with the permanent magnets and the iron core blocks alternately arranged, so that the cost of the motor is reduced, and the torque output of the motor is ensured. The aluminum winding is combined with the annular outer rotor formed by alternately arranging the permanent magnets and the iron core blocks at intervals, so that the cost of the motor can be reduced, and meanwhile, the torque output of the motor can be ensured by arranging the stator assembly in the form of wide-tooth deep grooves.

Specifically, the motor comprises a stator assembly and a rotor assembly, wherein the rotor assembly is sleeved outside the stator assembly, so that the motor forms an outer rotor motor, and meanwhile, a preset gap exists between the stator assembly and the rotor assembly to meet the arrangement requirement; the stator assembly comprises a stator core and aluminum windings, stator slots are formed between stator teeth on the stator core and are arranged along the radial direction of the stator core, the stator core is mainly used for winding the aluminum windings, the stator slots are used as accommodating spaces of the aluminum windings, and the aluminum windings can be wound on each stator tooth, so that enough magnetic fields can be generated after the stator teeth are electrified.

More specifically, the stator tooth is kept away from one side of stator module axis and can be set up spacing end, plays certain spacing effect to aluminium system winding together, simultaneously, because can form a space that holds aluminium system winding between spacing end and the stator tooth root, consequently aluminium system winding alright more convenient around establishing on the stator tooth, simultaneously, because the space that holds aluminium system winding is certain, therefore also can be comparatively easy realize the standardization processing of wire winding, improve wire winding efficiency, and then improve the manufacturing efficiency of whole motor, reduce manufacturing cost.

Further, the number of stator slots is 45, and the number of poles of the permanent magnet is 50.

Further, the aluminum winding adopts a concentrated winding structure so as to shorten the axial length of the motor and reduce the loss of winding end parts.

In one aspect of the present invention, the stator core further includes a yoke portion having a ring shape, the plurality of stator teeth being arranged along an outer periphery of the yoke portion; the yoke has a thickness in the radial direction of 4 mm or more and 6 mm or less.

In this technical scheme, because the stator tooth is set up on the yoke portion, consequently both can possess the same thickness, through limiting the thickness of yoke portion in radial direction, can make the stator tooth possess sufficient thickness, and then guarantee that the stator tooth can wind and establish more aluminium system windings for the stator tooth better matches with aluminium system winding, in reducing motor cost, can promote the efficiency of motor.

In one embodiment of the present invention, the ratio of the inner diameter of the stator core to the outer diameter of the stator core is 0.6 or more and 0.75 or less.

In this technical scheme, through the ratio of inject stator core's internal diameter and stator core's external diameter, be favorable to better external diameter that sets up the motor for the radial degree of depth of stator groove is great, in order to hold more aluminium system windings, makes in the reduction motor cost, can promote the efficiency of motor.

By setting the ratio of the inner diameter of the stator core to the outer diameter of the stator core to 0.6 to 0.75, it is ensured that the stator slots have sufficient depth, and because the depth of the stator slots is relatively deep, more turns of aluminum windings can be accommodated under the same conditions, thereby ensuring that the aluminum windings can generate sufficient magnetic field strength required by the operation of the motor.

Because the physical characteristic that the resistivity of metallic aluminum is great, compared with copper coil, the magnetic field of the same intensity needs to be produced, need to set up more relative aluminium windings, so need to increase the sectional area of aluminium wire winding in order to reduce the winding aluminium consumption when the motor operates, raise the efficiency, through increasing the degree of depth of stator slot in this technical scheme, on the one hand, under the prerequisite that other parameters such as width and thickness of stator slot remain unchanged, can increase the area of stator slot, thereby increase aluminium wire winding sectional area, and then reduce the winding aluminium consumption, on the other hand also can alleviate the saturation of stator tooth position, improve motor output under the heavy current, increase torque-current linear degree, simultaneously also be favorable to the promotion of stator tooth position heat dispersion.

In one aspect of the present invention, an area of the stator slot on a radial cross section of the stator core is 136 square millimeters or more and 152 square millimeters or less.

In the technical scheme, the area of the stator slot on one radial section of the stator core is 136 square millimeters to 152 square millimeters, so that the slot area of the stator slot is increased, the wire resistance of an aluminum winding is reduced, the winding loss is further reduced, and the efficiency of the motor is improved.

Further, the stator slot is of a deep slot structure, and the cross section area of the aluminum wire winding is large, so that the stator slot area is large, and the stator slot is required to be in a narrow and long shape along the radial direction on the premise of not influencing the saturation degree of the stator core.

Further, the stator slot has an area of 144 square millimeters on one radial cross section of the stator core.

In one aspect of the present invention, an air gap is provided between the stator assembly and the rotor assembly, and the length of the air gap in the radial direction is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

In this technical solution, torque ripple of the motor is further reduced by setting the length of the air gap in the radial direction to 0.3 mm to 0.5 mm.

Further, the rotor core can be designed in an irregular shape at the air gap side to form an unequal air gap structure, so that torque pulsation of the motor is improved.

A first side of the stator teeth facing the rotor assembly has a gap with the rotor assembly; the width of the gap in the radial direction decreases from both ends to the middle of the first side of the stator teeth in the circumferential direction. By reasonably adjusting the distribution of the air gaps, the cogging torque can be improved, and the torque fluctuation can be reduced.

In particular, the shape of the air gap may be set to be wide at both ends and narrow in the middle, and at the same time, the shape of the air gap may be symmetrically distributed along the center line of the stator teeth.

More specifically, in order to maintain the air gap in the form of the above-described two-end wide and middle narrow, only the end portion of the stator core may be set to an eccentric arc, or only one side of the rotor assembly close to the stator teeth may be set to an eccentric arc, or both the stator core and the rotor block may be set to an eccentric arc.

In one embodiment of the invention, the cross section of the aluminum winding is circular or rectangular.

In the technical scheme, the section of the aluminum winding is the section of the aluminum winding along the tangential direction of the stator assembly after being wound on the stator teeth, and the section of the aluminum winding can be set to be round or rectangular, so that the winding process is convenient to carry out.

In order to achieve the electromagnetic cost, the average torque and the torque pulsation of the motor, when the outer diameter of the rotor is 226mm, the ratio of the inner diameter of the stator to the outer diameter of the stator is 0.67, the ratio of the inner diameter of the rotor to the outer diameter of the rotor is 0.89, the length of the iron core lamination is 25.9mm, and the result shows that the torque pulsation of the motor at a rated point is 2.3%, the efficiency is 91%, the permanent magnet consumption is less, the torque density is high, and the cost of the motor is low.

In one technical scheme of the invention, the ratio of the axial length of the plurality of permanent magnets to the axial length of the plurality of iron core blocks is more than or equal to 1 and less than or equal to 1.05.

In the technical scheme, the end effect of the rotor assembly is adjusted by adjusting the axial lengths of the permanent magnets and the axial lengths of the iron core blocks. And the ratio of the axial length of the plurality of permanent magnets to the axial length of the plurality of iron core blocks is set to be 1 to 1.05, so that the end effect of the rotor assembly is improved, the output torque of the motor is improved, the overlong axial length of the permanent magnets is avoided, the influence on the axial size of the motor due to the length of the permanent magnets is further reduced, and the occupation of the motor on the axial space is reduced.

In one technical scheme of the invention, the ratio of the length of the permanent magnet in the circumferential direction to the length of the permanent magnet in the radial direction is more than or equal to 0.3 and less than or equal to 0.7.

In the technical scheme, the ratio of the length of the permanent magnet in the circumferential direction to the length of the permanent magnet in the radial direction is 0.3 to 0.7, and the ratio of the length to the length of the permanent magnet in the radial direction is limited in the range, so that the demagnetizing resistance of the motor can be further improved, the thickness of the permanent magnet in the magnetizing direction can be further reduced, and the manufacturing cost of the motor is further reduced.

Further, each of the plurality of permanent magnets has a rectangular cross section in the radial direction.

Each permanent magnet is set to be rectangular in shape, and by defining the aspect ratio of the rectangular permanent magnet, the demagnetization resistance of the motor can be improved; and the anti-demagnetizing capability of the motor is improved, so that the thickness of the permanent magnet in the magnetization direction can be reduced, the setting cost of the permanent magnet is reduced, and the manufacturing cost of the motor is further reduced.

In one aspect of the present invention, magnetizing directions of two adjacent permanent magnets of the plurality of permanent magnets are opposite or opposite in a circumferential direction of the rotor assembly.

In the technical scheme, the adjacent permanent magnets are arranged in a mode that magnetizing directions are opposite or opposite, so that an independent magnetic part can be formed between the adjacent permanent magnets, in other words, two adjacent permanent magnets can form a group of magnetic pieces.

The operation of the rotor assembly can be realized by the interaction between the adjacent iron core blocks of the permanent magnets and the energized aluminum winding through the magnetic parts formed by the two adjacent permanent magnets.

Specifically, two permanent magnets with opposite N poles may form a set of magnetic elements, or two permanent magnets with opposite S poles may form a set of magnetic elements.

In one technical scheme of the invention, the rotor assembly further comprises a fixing ring sleeved on the outer sides of the iron core blocks and connected with the iron core blocks and the permanent magnets.

In this technical scheme, rotor subassembly still includes the retainer plate, and the retainer plate mainly exists as the assembly base member of iron core piece and permanent magnet, can set up iron core piece and permanent magnet at the retainer plate in advance to with fixed connection between the retainer plate, make constitute the construction of overall structure between iron core piece, permanent magnet and the retainer plate, so alright realize the modularization assembly of iron core piece, permanent magnet and retainer plate to a certain extent, be favorable to improving the assembly efficiency of whole motor.

Meanwhile, the fixing ring is adopted as an assembly matrix of the iron core block and the permanent magnet, and the shape of the fixing ring is fixed, so that the iron core block and the permanent magnet are more easily arranged at uniform intervals, the uniformity of a magnetic field generated by the iron core block and the permanent magnet is improved, and the running stability of the motor is improved.

The retainer ring may be aluminum or other non-magnetically conductive material to ensure proper operation of the motor.

Specifically, iron core piece and permanent magnet accessible sticky form is fixed on the retainer plate, and the inboard of retainer plate can also set up the holding tank for play certain position limiting effect to iron core piece and permanent magnet, simultaneously, also can more convenient and fast carry out iron core piece and permanent magnet sticky work, improvement work efficiency.

In one embodiment of the present invention, the ratio of the inner diameter of the retainer ring to the outer diameter of the retainer ring is 0.96 or more and 0.98 or less.

In the technical scheme, the strength of the fixing ring can be adjusted by adjusting the dimensional relationship between the inner diameter of the fixing ring and the outer diameter of the fixing ring. Through setting the ratio of the inner diameter of the fixed ring to the outer diameter of the fixed ring to be 0.96-0.98, the strength of the fixed ring can be improved, and then the stability of the rotor assembly during working is improved.

Because the stability of rotor subassembly at the during operation has been promoted, at the stator module drive rotor subassembly pivoted in-process of motor, rotor subassembly's vibration is littleer, and then reduces the noise that the motor produced because of the vibration.

In one embodiment of the present invention, a ratio of an inner diameter of the plurality of core blocks to an outer diameter of the plurality of core blocks is 0.91 or more and 0.97 or less.

In the technical scheme, the torque pulsation is adjusted by adjusting the dimensional relation between the inner diameters of the iron core blocks and the outer diameters of the iron core blocks. By setting the ratio of the inner diameter of the plurality of core blocks to the outer diameter of the plurality of core blocks to 0.91 to 0.97, the torque ripple of the motor can be reduced, thereby making the output of the motor more stable and reducing the vibration and noise of the motor.

In one technical scheme of the invention, the ratio of the length of the permanent magnet in the radial direction to the outer diameters of the iron core blocks is more than or equal to 0.01 and less than or equal to 0.04.

In the technical scheme, the ratio of the length of the permanent magnet in the radial direction to the outer diameters of the iron core blocks is set to be 0.01-0.04, so that the problem that the output torque is small due to the fact that the radius of an air gap is small when the radial length of the permanent magnet is too long can be avoided, and the output torque of the motor is further improved; the magnetic concentration effect of the permanent magnet is poor due to the fact that the radial length of the permanent magnet is too short, the magnetic leakage ratio of the radial end part is large, the magnetic concentration effect of the permanent magnet is improved, and the magnetic leakage of the end part is reduced.

A second aspect of the present invention provides a vehicle comprising a motor according to any of the above-described aspects, and therefore having all the advantages of a motor according to any of the above-described aspects.

The vehicles comprise electric bicycles, electric motorcycles, electric scooters, electric balance cars, electric automobiles and other electric vehicles, and can also be hybrid motor vehicles comprising motors.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 is one of schematic structural views of an electric motor according to an embodiment of the present invention;

FIG. 2 is one of the structural schematic diagrams of a rotor assembly according to one embodiment of the invention;

FIG. 3 is a partial schematic view of the rotor assembly at K shown in FIG. 2 according to one embodiment of the invention;

FIG. 4 is a second schematic diagram of an electric machine according to an embodiment of the present invention;

FIG. 5 is a partial schematic view of the motor at C shown in FIG. 1 according to one embodiment of the invention;

FIG. 6 is a schematic structural view of a retainer ring according to one embodiment of the present invention;

FIG. 7 is a second schematic structural view of a rotor assembly according to one embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 7 is:

100 stator assemblies, 110 stator cores, 112 stator teeth, 114 stator slots, 116 yokes, 120 aluminum windings, 200 rotor assemblies, 210 core blocks, 220 permanent magnets, 230 stator coils.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

An electric machine and a vehicle according to some embodiments of the invention are described below with reference to fig. 1 to 7.

In one embodiment of the present invention, as shown in fig. 1, there is provided a motor for driving a hub, the motor including a rotor assembly 200 and a stator assembly 100, the rotor assembly 200 being sleeved outside the stator assembly 100, the rotor assembly 200 including a plurality of core blocks 210 and a plurality of permanent magnets 220; the plurality of core blocks 210 are arranged in the circumferential direction; the plurality of permanent magnets 220 are respectively disposed between adjacent ones 210 of the plurality of core blocks 210, each permanent magnet 220 of the plurality of permanent magnets 220 being disposed in a radial direction; wherein, as shown in fig. 2 and 3, the axial length L of the plurality of permanent magnets 220 is greater than the axial length M of the plurality of core blocks 210.

In this embodiment, the rotor assembly 200 includes a plurality of core blocks 210 and a plurality of permanent magnets 220, the plurality of core blocks 210 are arranged along the circumferential direction, mounting grooves are formed between adjacent core blocks 210 in the plurality of core blocks 210, and the plurality of permanent magnets 220 are respectively disposed in the mounting grooves between adjacent core blocks 210 in the plurality of core blocks 210, so that the stator assembly 100 of the motor can drive the rotor assembly 200 to rotate, and output power is achieved. And by adjusting the axial length of the plurality of permanent magnets 220 and the axial length of the plurality of core blocks 210, an adjustment of the end effect of the rotor assembly 200 is achieved; by setting the axial length of the plurality of permanent magnets 220 to be greater than the axial length of the plurality of core blocks 210, it is achieved to reduce the end effect of the rotor assembly 200, thereby enhancing the output torque of the motor.

Since the axial length L of the plurality of permanent magnets 220 is greater than the axial length M of the plurality of core blocks 210, which is equivalent to increasing the axial length L of the permanent magnets 220, and the axial length M of the core blocks 210 is unchanged, the material cost of the rotor assembly 200 is smaller than that of a motor that increases the axial length of the whole rotor assembly 200, thereby realizing the reduction of the material cost of the motor while improving the output torque of the motor.

Because the axial length of the plurality of permanent magnets 220 is set to be greater than the axial length of the plurality of iron core blocks 210, the end effect of the rotor assembly 200 can be reduced, the simulation experiment result of the motor is closer to the actual working parameter of the motor, the output torque of the motor obtained by the simulation experiment is closer to the actual output torque of the motor, and further the actual output torque of the motor is prevented from being too small due to the fact that the output torque of the simulation experiment is far greater than the actual output torque of the motor, and the actual output torque of the motor is further improved.

The rotor assembly 200 includes a plurality of core blocks 210 and a plurality of permanent magnets 220, and the permanent magnets 220 and the core blocks 210 are alternately arranged at intervals to form a ring structure and to form an outer rotor. The permanent magnets 220 and the iron core blocks 210 are alternately arranged at intervals to form an annular outer rotor, and the shape of the permanent magnets 220 is not limited to be tile-shaped, so that the consumption of the iron core blocks 210 can be reduced, the cost of the motor can be reduced, meanwhile, the size of the iron core blocks 210 is not limited by the pole arc coefficient, and meanwhile, the magnetic focusing effect of the parallel magnetic circuit enables the torque density of the motor to be higher, and further, the power of the motor can be improved under the same condition, and the torque output of the motor is ensured.

Further, the plurality of core blocks 210 are circumferentially arranged to form a rotor core, the rotor core adopts a non-magnetic bridge structure, and the tangential thickness of the permanent magnet 220 is preferably 3mm, so as to reduce the demagnetization risk of the permanent magnet 220. To reduce end effects, the rotor core stack length is 25.9mm and the permanent magnet 220 axial length is 26.9mm.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 4, the motor further includes a stator assembly 100, the rotor assembly 200 is sleeved outside the stator assembly 100, the stator assembly 100 includes a stator core 110 and an aluminum winding 120, the stator core 110 includes a plurality of stator teeth 112, the plurality of stator teeth 112 are circumferentially arranged, stator slots 114 are formed between adjacent stator teeth 112 of the plurality of stator teeth 112, and the stator slots 114 extend in a radial direction. An aluminum winding 120 is embedded in the stator slot 114.

In this embodiment, the motor includes a stator assembly 100 and a rotor assembly 200, the stator assembly 100 including an aluminum winding 120, the aluminum winding 120 being energized to form an excitation, the interaction with the rotor assembly 200 allowing the rotor assembly 200 to operate; meanwhile, the stator core 110 may be formed by axially laminating stator laminations. The combination of the aluminum windings 120 with the outer rotor in which the permanent magnets 220 and the core blocks 210 are alternately arranged reduces the cost of the motor and ensures the torque output of the motor. By combining the aluminum windings 120 with the outer rotor formed in a ring shape by alternately arranging the permanent magnets 220 and the core blocks 210 at intervals, firstly the aluminum windings 120 can reduce the cost of the motor, and at the same time, by arranging the stator assembly 100 in the form of wide-tooth deep grooves, the torque output of the motor can be ensured.

Specifically, the motor comprises a stator assembly 100 and a rotor assembly 200, wherein the rotor assembly 200 is sleeved outside the stator assembly 100, so that the motor forms an outer rotor motor, and meanwhile, a preset gap exists between the stator assembly and the rotor assembly to meet the arrangement requirement; the stator assembly 100 includes a stator core 110 and aluminum windings 120, stator slots 114 are formed between stator teeth 112 on the stator core 110 and arranged along a radial direction of the stator core 110, the stator core 110 is mainly used for winding the aluminum windings 120, and the stator slots 114 are used as accommodating spaces of the aluminum windings 120, and each stator tooth 112 can be wound with the aluminum windings 120, so that a sufficient magnetic field can be generated after the stator teeth are electrified.

More specifically, the side of the stator teeth 112 far away from the axis of the stator assembly 100 can be provided with a limiting end, which plays a certain limiting role on the aluminum winding 120, meanwhile, because a space for accommodating the aluminum winding 120 is formed between the limiting end and the root of the stator teeth 112, the aluminum winding 120 can be more conveniently wound on the stator teeth 112, meanwhile, because the space for accommodating the aluminum winding 120 is certain, the standardized processing of winding can be easily realized, the winding efficiency is improved, the manufacturing efficiency of the whole motor is further improved, and the manufacturing cost is reduced.

Further, the number of stator slots 114 is 45 and the number of poles of the permanent magnet 220 is 50.

Further, the aluminum windings 120 are formed with a concentrated winding structure to shorten the motor shaft length while reducing winding end losses.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 4, the stator core 110 further includes a yoke 116, the yoke 116 having a ring shape, and a plurality of stator teeth 112 arranged along an outer circumference of the yoke 116; the yoke 116 has a thickness in the radial direction of 4 mm or more and 6mm or less.

In this embodiment, since the stator teeth 112 are disposed on the yoke 116, they may have the same thickness, and by limiting the thickness of the yoke 116 in the radial direction, the stator teeth 112 may have a sufficient thickness, so as to ensure that the stator teeth 112 can be wound with more aluminum windings 120, so that the stator teeth 112 are better matched with the aluminum windings 120, and the efficiency of the motor can be improved while the cost of the motor is reduced.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1, the ratio of the inner diameter B of the stator core 110 to the outer diameter a of the stator core 110 is 0.6 or more and 0.75 or less.

In this embodiment, by defining the ratio of the inner diameter B of the stator core 110 to the outer diameter a of the stator core 110, it is advantageous to better set the outer diameter of the motor so that the depth of the stator slots 114 in the radial direction is greater to accommodate more aluminum windings 120, so that the efficiency of the motor can be improved while reducing the cost of the motor.

By setting the ratio of the inner diameter B of the stator core 110 to the outer diameter a of the stator core 110 to 0.6 to 0.75, it is ensured that the stator slots 114 have a sufficient depth, and since the depth of the stator slots 114 is relatively deep, it is possible to accommodate more turns of the aluminum winding 120 under the same condition, thereby ensuring that the aluminum winding 120 can generate a magnetic field strength required for sufficient motor operation.

Because of the physical characteristic of the large resistivity of aluminum metal, compared with copper coils, to generate a magnetic field with the same intensity, it is necessary to provide relatively more aluminum windings 120, so that the cross-sectional area of the aluminum wire windings needs to be increased to reduce the aluminum consumption of the windings during motor operation, and to improve the efficiency.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

The stator slot 114 has an area of 136 square millimeters or more and 152 square millimeters or less on one radial cross section of the stator core 110.

In this embodiment, by setting the area of the stator slot 114 on one radial cross section of the stator core 110 to 136 square millimeters to 152 square millimeters, the slot area of the stator slot 114 is increased, the line resistance of the aluminum winding 120 is reduced, and thus the winding loss is reduced, and the efficiency of the motor is improved.

Further, the stator slot 114 has a deep slot structure, and since the sectional area of the aluminum wire winding is large, the area of the stator slot 114 is large, and it is necessary to extend the area of the stator slot 114 in the radial direction without affecting the saturation degree of the stator core, and the stator slot 114 has a narrow and long shape.

Further, the stator slot 114 has an area of 144 square millimeters on one radial cross section of the stator core 110.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 5, an air gap is provided between the stator assembly 100 and the rotor assembly 200, and the length D of the air gap in the radial direction is 0.3 mm or more and 0.5 mm or less.

In this embodiment, torque ripple of the motor is further reduced by setting the length D of the air gap in the radial direction to 0.3 mm to 0.5 mm.

Further, the rotor core can be designed in an irregular shape at the air gap side to form an unequal air gap structure, so that torque pulsation of the motor is improved.

The first side of the stator teeth 112 facing the rotor assembly 200 has a gap with the rotor assembly 200; the width of the gap in the radial direction decreases from both ends to the middle of the first side of the stator teeth 112 in the circumferential direction. By reasonably adjusting the distribution of the air gaps, the cogging torque can be improved, and the torque fluctuation can be reduced.

In particular, the shape of the air gap may be set to be wide at both ends and narrow at the middle, while the shape of the air gap may be made to be symmetrically distributed along the center line of the stator teeth 112.

More specifically, in order to maintain the air gap in the form of the above-described two-end wide and middle narrow, only the end portion of the stator core 110 may be set to an eccentric arc, or only one side of the rotor assembly 200 near the stator teeth 112 may be set to an eccentric arc, or both the stator core 110 and the rotor block may be set to an eccentric arc.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

The aluminum windings 120 are circular or rectangular in cross-section.

In this embodiment, the cross section of the aluminum winding 120 is the cross section of the aluminum winding 120 along the tangential direction to the stator assembly 100 after being wound on the stator teeth 112, and the cross section of the aluminum winding 120 may be configured to be circular or rectangular to facilitate the winding process.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

The ratio M of the axial length L of the plurality of permanent magnets 220 to the axial length of the plurality of core blocks 210 is 1 or more and 1.05 or less.

In this embodiment, the adjustment of the end effect of the rotor assembly 200 is achieved by adjusting the axial length L of the plurality of permanent magnets 220 and the axial length M of the plurality of core blocks 210. And by setting the ratio of the axial length L of the plurality of permanent magnets 220 to the axial length M of the plurality of core blocks 210 to 1 to 1.05, the end effect of the rotor assembly 200 is improved, the output torque of the motor is improved, the axial length of the permanent magnets 220 is prevented from being too long, the influence on the axial dimension of the motor due to the length extension of the permanent magnets 220 is reduced, and the occupation of the axial space of the motor is reduced.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 5, the ratio of the length F of the permanent magnet 220 in the circumferential direction to the length E of the permanent magnet 220 in the radial direction is 0.3 or more and 0.7 or less.

In this embodiment, the ratio of the length F of the permanent magnet 220 in the circumferential direction to the length E of the permanent magnet 220 in the radial direction is 0.3 to 0.7, and the ratio of the two is limited to be within this range, so that the demagnetization resistance of the motor can be further improved, and therefore the thickness of the permanent magnet 220 in the magnetization direction can be further reduced, and the manufacturing cost of the motor can be further reduced.

Further, each permanent magnet 220 of the plurality of permanent magnets 220 has a rectangular cross section in the radial direction.

Each permanent magnet 220 is provided in a rectangular shape, and by defining an aspect ratio of the rectangular permanent magnet 220, the demagnetization resistance of the motor can be improved; and because the anti-demagnetizing capability of the motor is improved, the thickness of the permanent magnet 220 in the magnetization direction can be reduced, the setting cost of the permanent magnet 220 is reduced, and the manufacturing cost of the motor is further reduced.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

The magnetizing directions of adjacent two permanent magnets 220 among the plurality of permanent magnets 220 are opposite or opposite in the circumferential direction of the rotor assembly 200.

In this embodiment, the adjacent permanent magnets 220 are disposed in such a manner that the magnetizing directions are opposite or opposite, so that an independent magnetic portion is formed between the adjacent permanent magnets 220, in other words, two adjacent permanent magnets 220 may form a set of magnetic members.

The operation of the rotor assembly 200 can be achieved by the interaction between the adjacent core blocks 210 of the permanent magnets 220 and the energized aluminum windings 120 through the magnetic members formed by the two adjacent permanent magnets 220.

Specifically, a set of magnetic elements may be formed by two permanent magnets 220 with opposite N poles, or a set of magnetic elements may be formed by two permanent magnets 220 with opposite S poles.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1, the rotor assembly 200 further includes a fixing ring 230, and the fixing ring 230 is sleeved on the outer sides of the plurality of core blocks 210 and is simultaneously connected with the plurality of core blocks 210 and the plurality of permanent magnets 220.

In this embodiment, the rotor assembly 200 further includes a fixing ring 230, where the fixing ring 230 mainly serves as an assembly matrix of the core block 210 and the permanent magnet 220, and the core block 210 and the permanent magnet 220 may be disposed in the fixing ring 230 in advance and fixedly connected with the fixing ring 230, so that an integral structure is formed among the core block 210, the permanent magnet 220 and the fixing ring 230, and thus modular assembly of the core block 210, the permanent magnet 220 and the fixing ring 230 can be achieved to a certain extent, which is beneficial to improving the assembly efficiency of the whole motor.

Meanwhile, the fixing ring 230 is adopted as an assembly matrix of the iron core block 210 and the permanent magnet 220, and the shape of the fixing ring 230 is fixed, so that the iron core block 210 and the permanent magnet 220 are more easily arranged at uniform intervals, the uniformity of a magnetic field generated by the iron core block 210 and the permanent magnet 220 is improved, and the running stability of a motor is improved.

The retainer ring 230 may be aluminum or other non-magnetically conductive material to ensure proper operation of the motor.

Specifically, the iron core block 210 and the permanent magnet 220 can be fixed on the fixing ring 230 in an adhesive manner, and an accommodating groove can be formed in the inner side of the fixing ring 230 to limit the positions of the iron core block 210 and the permanent magnet 220, and meanwhile, the adhesive operation of the iron core block 210 and the permanent magnet 220 can be more conveniently and rapidly performed, so that the working efficiency is improved.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 6, the ratio of the inner diameter J of the retainer ring 230 to the outer diameter I of the retainer ring 230 is 0.96 or more and 0.98 or less.

In this embodiment, the strength of retainer ring 230 can be further adjusted by adjusting the dimensional relationship between inner diameter J of retainer ring 230 and outer diameter I of retainer ring 230. By setting the ratio of the inner diameter J of the retainer ring 230 to the outer diameter I of the retainer ring 230 to 0.96 to 0.98, the strength of the retainer ring 230 can be improved, thereby improving the stability of the rotor assembly 200 during operation.

Since the stability of the rotor assembly 200 in operation is improved, the vibration of the rotor assembly 200 is smaller in the process of driving the rotor assembly 200 to rotate by the stator assembly 100 of the motor, thereby reducing the noise generated by the motor due to the vibration.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 7, the ratio of the inner diameter G of the plurality of core blocks 210 to the outer diameter H of the plurality of core blocks 210 is 0.91 or more and 0.97 or less.

In this embodiment, the adjustment of torque ripple is achieved by adjusting the dimensional relationship of the inner diameter G of the plurality of core blocks 210 to the outer diameter H of the plurality of core blocks 210. By setting the ratio of the inner diameter G of the plurality of core blocks 210 to the outer diameter H of the plurality of core blocks 210 to 0.91 to 0.97, the torque ripple of the motor can be reduced, thereby making the output of the motor more stable and reducing the vibration and noise of the motor.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 5 and 7, the ratio of the length E of the permanent magnet 220 in the radial direction to the outer diameter H of the plurality of core blocks 210 is 0.01 or more and 0.04 or less.

In this embodiment, by setting the ratio of the length E of the permanent magnet 220 in the radial direction to the outer diameters H of the plurality of core blocks 210 to 0.01 to 0.04, it is possible to avoid that the output torque is small due to the small radius of the air gap when the radial length of the permanent magnet 220 is too long, thereby achieving the improvement of the output torque of the motor; the problem that the magnetic concentration effect of the permanent magnet 220 is poor due to the too short radial length of the permanent magnet 220 can be avoided, the magnetic leakage ratio of the radial end part is large, the magnetic concentration effect of the permanent magnet 220 is improved, and the magnetic leakage of the end part is reduced.

In order to achieve the electromagnetic cost, the average torque and the torque pulsation of the motor, when the outer diameter of the rotor is 226mm, the ratio of the inner diameter of the stator to the outer diameter of the stator is 0.67, the ratio of the inner diameter of the rotor to the outer diameter of the rotor is 0.89, the length of the iron core lamination is 25.9mm, and the result shows that the torque pulsation of the motor at a rated point is 2.3%, the efficiency is 91%, the permanent magnet 220 consumption is less, the torque density is high, and the cost of the motor is low.

In one embodiment of the invention, a vehicle is provided that includes the motor of any of the embodiments described above, and thus has all of the benefits of the motor of any of the embodiments described above.

The vehicles comprise electric bicycles, electric motorcycles, electric scooters, electric balance cars, electric automobiles and other electric vehicles, and can also be hybrid motor vehicles comprising motors.

In the claims, specification and drawings of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. The utility model provides a motor, its characterized in that, the motor is used for driving wheel hub, the motor includes rotor subassembly and stator module, rotor subassembly cover is located the stator module outside, the rotor subassembly includes:

a plurality of core blocks arranged in a circumferential direction;

the permanent magnets are respectively arranged between adjacent iron core blocks in the plurality of iron core blocks, and each permanent magnet in the plurality of permanent magnets is arranged along the radial direction;

Wherein the axial length of the plurality of permanent magnets is greater than the axial length of the plurality of core blocks.

2. The electric machine of claim 1, wherein the stator assembly comprises:

The stator core comprises a plurality of stator teeth, wherein the plurality of stator teeth are arranged along the circumferential direction, stator grooves are formed between adjacent stator teeth in the plurality of stator teeth, and the stator grooves extend along the radial direction;

and the aluminum winding is embedded in the stator groove.

3. The electric machine of claim 2, wherein a ratio of an inner diameter of the stator core to an outer diameter of the stator core is 0.6 or more and 0.75 or less.

4. The electric machine of claim 2, wherein an area of the stator slot on one radial cross section of the stator core is 136 square millimeters or more and 152 square millimeters or less.

5. The electric machine of claim 2, wherein there is an air gap between the stator assembly and the rotor assembly, the air gap having a length in a radial direction of 0.3 millimeters or more and 0.5 millimeters or less.

6. The electric machine of claim 2, wherein the aluminum windings are circular or rectangular in cross-section.

7. The electric machine of claim 1, wherein a ratio of an axial length of the plurality of permanent magnets to an axial length of the plurality of core blocks is 1 or more and 1.05 or less.

8. The motor according to claim 1, wherein a ratio of a length of the permanent magnet in a circumferential direction to a length of the permanent magnet in a radial direction is 0.3 or more and 0.7 or less.

9. The electric machine of claim 1, wherein the magnetization directions of adjacent two of the plurality of permanent magnets are opposite or facing away from each other in the circumferential direction of the rotor assembly.

10. The electric machine of claim 1, wherein the rotor assembly further comprises:

the fixing ring is sleeved on the outer sides of the iron core blocks and is connected with the iron core blocks and the permanent magnets.

11. The motor of claim 10, wherein a ratio of an inner diameter of the retainer ring to an outer diameter of the retainer ring is 0.96 or greater and 0.98 or less.

12. The motor according to any one of claims 1 to 11, characterized in that a ratio of an inner diameter of the plurality of core blocks to an outer diameter of the plurality of core blocks is 0.91 or more and 0.97 or less.

13. The motor according to any one of claims 1 to 11, characterized in that a ratio of a length of the permanent magnet in a radial direction to an outer diameter of the plurality of core blocks is 0.01 or more and 0.04 or less.

14. A vehicle comprising an electric machine as claimed in any one of claims 1 to 13.