KR20240091554A - Axial flux motor having support structure for rotation shaft bearing - Google Patents

Abstract

The present invention relates to an axial flux motor including a rotating shaft bearing support structure.
The present invention includes a rotor 100 having a plurality of permanent magnets 110; A stator 200 facing the rotor 100 and including a plurality of field coil units 210; An axial magnetic flux motor (10) coupled to the rotor (100) and including a rotation shaft (300) rotatably installed through the central portion of the stator (200), wherein the rotation shaft (300) and the stator (200) A shaft comprising one or more bearings 400 installed between the rotating shafts 300, wherein the bearing coupling area BC where the bearings 400 are coupled is formed to have different dimensions from the other areas. Directional flux motor 10 is disclosed.

Description

Axial flux motor having support structure for rotation shaft bearing}

The present invention relates to an axial flux motor including a rotating shaft bearing support structure.

In general, a motor is a device that obtains rotational power by converting electrical energy into mechanical energy. Motors are divided into alternating current motors and direct current motors depending on the type of power applied from the outside.

These motors operate on the principle that torque is generated on the rotor by a rotating magnetic field that occurs when current flows through a wound coil.

Conventional motors mostly consist of a housing, a stator (hereinafter referred to as a stator) fixedly coupled to the inside of the housing, a plurality of cores installed on the stator, a plurality of coils individually wound on the coils, and a stator facing the core. It consists of a permanent magnet that is installed and rotated by the magnetic force of the coil, and a rotor that is combined with the permanent magnet and rotates.

An axial flux motor refers to a motor in which the air gap is flat and the magnetic field distribution along the axial direction is perpendicular to the air gap plane. Axial flux motors have characteristics of high torque, low weight, and high efficiency compared to radial flux motors, so they are suitable for industrial fields that require high torque density and miniaturization.

Meanwhile, the axial magnetic flux motor may include a rotor including a plurality of permanent magnets, a stator including a plurality of wound field coils, and a rotation shaft coupled to the rotor and rotating.

At this time, a bearing may be installed between the rotating shaft and the stator to smoothly rotate and support the rotating shaft.

As the axial magnetic flux motor rotates at high speeds, it is necessary to have a structure that can stably couple and support the bearings. For ease of manufacturing, it is necessary to have a structure that can stably couple and support the bearings while also allowing the bearing installation structure to be easily configured. Technology is required.

In addition, when the axial flux motor rotates at high speed, the field coil part of the stator may generate heat, and in a high temperature environment, structural stability inside the motor may decrease or motor performance may deteriorate.

The purpose of the present invention is to recognize the above-mentioned need, to facilitate the installation and fixation of bearings coupled to the rotating shaft, and to stably support the bearings and effectively reduce the load applied to the bearings, thereby ensuring stable operation even during high-speed rotation. The goal is to provide an axial magnetic flux motor that can guarantee

The present invention was created to achieve the object of the present invention as described above, and includes a rotor 100 having a plurality of permanent magnets 110; A stator 200 facing the rotor 100 and including a plurality of field coil units 210; Disclosed is an axial magnetic flux motor (10) including a rotation shaft (300) coupled to the rotor (100) and rotatably installed through the central portion of the stator (200).

It may include one or more bearings 400 installed between the rotation shaft 300 and the stator 200.

Among the rotating shafts 300, the bearing coupling area BC where the bearing 400 is coupled may be formed to have different dimensions from other areas.

The rotor 100 may be provided as a pair with the stator 200 sandwiched between them.

The bearings 400 may be provided as a pair.

The pair of bearings 400 may be installed to be spaced apart from each other at a preset distance (DT) along the axial direction (R) of the rotation shaft (300).

The axial flux motor 10 may further include a spacer 500 installed between the pair of bearings 400 to support the pair of bearings 400.

Both ends of the spacer 500 may be installed to respectively support the inner rings 410 of the pair of bearings 400.

The spacer 500 may have a first through hole 502 formed in the center through which the rotation axis 300 passes.

The stator 200 includes a hollow stator hub 220 with a second through hole 222 formed in the center, and a plurality of spokes 230 extending radially outward from the outer peripheral surface of the stator hub 220. It can be included.

The stator 200 may further include a bushing member 240 installed between the spacer 500 and the stator hub 220 within the second through hole 222 of the stator hub 220. .

At least one of both ends of the bushing member 240 may be installed to support the outer ring 420 of the bearing 400.

The stator hub 220 may be provided with a step portion 224 that protrudes radially inward from the second through hole 222 to support the outer ring 420 of the bearing 400.

The axial magnetic flux motor of the present invention has the advantage of ensuring stable operation even during high-speed rotation by facilitating the installation and fixation of the bearing coupled to the rotating shaft, stably supporting the bearing, and effectively reducing the load applied to the bearing. There is.

1 is a cross-sectional view showing an axial flux motor according to an embodiment of the present invention.
Figure 2 is a perspective view showing the rotor of Figure 1.
FIG. 3 is a cross-sectional view showing part of the structure of FIG. 2.
Figure 4 is a modified example of Figure 3.
FIG. 5 is a cross-sectional view showing part of the structure of FIG. 3.
Figure 6 is a modified example of Figure 5.
Figure 7 is a perspective view showing the stator of Figure 1.
FIG. 8 is a plan view showing part of the structure of FIG. 7.
Figure 9 is a cross-sectional view of Figure 7.
FIG. 10 is a cross-sectional view showing the rotation axis of FIG. 1.
FIG. 11 is a front view showing a bushing member coupled to the stator of FIG. 1.
FIG. 12 is a perspective view showing a spacer coupled to the rotation axis of FIG. 10.
FIG. 13 is a diagram showing a flow path formed in the stator of FIG. 7.
FIG. 14 is a schematic diagram explaining the flow of refrigerant flowing through the flow path in FIG. 13.

Hereinafter, the axial magnetic flux motor according to the present invention will be described with reference to the attached drawings.

The axial magnetic flux motor 10 according to the present invention includes a rotor 100 including a plurality of permanent magnets 110, as shown in FIGS. 1 to 14; A stator 200 facing the rotor 100 and including a plurality of field coil units 210; It is coupled to the rotor 100 and includes a rotation shaft 300 rotatably installed through the central portion of the stator 200.

The axial magnetic flux motor 10 may be a PMAC (Permanent Magnet AC) motor using permanent magnets, but is not limited thereto.

The rotor 100 is a rotor including a plurality of permanent magnets 110 and a back iron 120 on which the plurality of permanent magnets 110 are disposed, and can be configured in various ways.

The back iron 120 is a steel (electrical sheet) in which a plurality of permanent magnet parts 110 are arranged to form a magnetic flux path between adjacent permanent magnet parts 110, and the rotation axis 300 is located in the center. It may be formed in the shape of a disk through which an opening is formed.

The back iron 120 may have a laminated structure (layered structure) to reduce iron loss.

The front surface (S1) of the back iron 120 is the surface facing the stator 200 when constructing the axial magnetic flux motor 10, and a plurality of permanent magnets 110 are installed on the front surface (S1) of the back iron 120. It may be arranged at intervals along the circumferential direction (CD) of the back iron 120.

The front surface (S1) of the back iron 120 is a surface to which a plurality of permanent magnets 110 are attached and may be formed as a flat plane.

The plurality of permanent magnets 110 may be attached to the front surface (S1) of the back iron 120.

The plurality of permanent magnets 110 may be arranged with N poles and S poles alternating with each other.

The permanent magnet 110 may be formed as a single permanent magnet member, or may be composed of a plurality of divided permanent magnet cells 112a to 112e.

The permanent magnet 110 may be formed in a fan-shaped or trapezoidal shape whose width increases toward the outer portion of the back iron 120.

When the permanent magnet 110 is composed of a plurality of divided permanent magnet cells 112a to 112e, the permanent magnet cells 112a to 112e are aligned along the radial direction (RD) of the back iron 120. However, this is only one possible embodiment, and of course, various forms of arrangement are possible.

The size of the plurality of permanent magnet cells 112a to 112e may increase in the radial direction RD of the back iron 120.

Meanwhile, the rotor 100 includes a plurality of magnet holder parts 130 installed between the plurality of permanent magnet parts 110 so that the spacing between the plurality of permanent magnets 110 is maintained constant. Additional information may be included.

The magnet holder portion 130 is formed in a bar shape with a length L, and can be placed between neighboring permanent magnets 110.

The plurality of magnet holder parts 130 may be radially arranged on the front surface (S1) of the back iron 120 as the plurality of permanent magnets 110 are arranged along the circumferential direction (CD).

For example, the magnet holder portion 130 may be formed in an arc-shaped cross section in the width (W) direction perpendicular to the rod-shaped length (L).

At this time, the magnet holder portion 130 is preferably installed on the front surface (S1) of the back iron 120 so that the concave side faces the stator 200.

There may be a spaced space between the side of the magnet holder part 130 and the neighboring permanent magnets 110, or the magnetic flux holder part 130 and the neighboring permanent magnets 110 may be installed in close contact without a spaced space. .

When the spacing between neighboring permanent magnets 110 is not uniform, there is a problem in that the uniformity of magnetic flux distribution deteriorates and the performance of the motor deteriorates. However, the present invention provides a magnet holder between neighboring permanent magnets 110. By providing the part 130, there is an advantage in that the distance between the permanent magnets 110 can be kept constant and the permanent magnets 110 can be fixed (maintained) in the correct position.

As another example of the shape of the magnet holder portion 130, the magnet holder portion 130 may be formed in a T-shape in cross section in the width (W) direction perpendicular to the length (L) of the bar shape.

The magnet holder portion 130 has an arch-shaped or T-shaped cross-section, thereby dispersing the force applied to the magnet holder portion 130 in the axial direction (R) when the rotor 100 rotates, creating a stable structure. There is an advantage in that the motor efficiency can be improved by reducing the thickness of the magnet holder portion 130 and the weight of the rotor 100.

In addition, the rotor 100 includes a rotor housing 140 that supports the rear surface (S2) of the back iron 120, the magnet holder portion 130, and the back iron 120. ) may additionally include a bolting member 150 that passes through the back iron 120 and is bolted to the magnet holder portion 130 and the rotor housing 140.

The rotor housing 140 is a support frame that supports the rear surface S2 of the back iron 120 and can be configured in various ways.

Here, the back surface (S2) of the back iron 120 is a surface facing away from the stator 200, and refers to the surface opposite to the front surface (S1) of the back iron 120 on which the permanent magnet 110 is disposed. .

The rotor housing 140 has a disk shape, and the center (PC) of the rotor housing 140 may coincide with the center (PC) of the back iron 120.

The surface of the rotor housing 140 facing the back iron 120 is formed in a shape that conforms to the shape of the back iron 120 (S2) and can be in close contact with the back iron 120 (S2).

The bolt coupling member 150 penetrates the back iron 120 to secure the magnet holder 130 and the back iron 120 to the rotor housing 140. ) and a fixing member bolted to the rotor housing 140, and various configurations are possible.

At this time, through-holes 126 may be formed in the back iron 120 for through-coupling the bolt coupling member 150.

The bolt coupling member 150 may be bolted to the rotor housing 140 through the through hole 126 of the back iron 120 from the magnet holder portion 130 side.

To this end, the magnet holder portion 130 may be provided with at least one coupling hole into which the bolt coupling member 150 is coupled.

As shown in FIG. 2, the rotor 100 may be provided as a pair with the stator 200 sandwiched between them.

When the rotor 100 is provided as a pair, one rotor housing 140 has a disk shape with an opening 142 through which the rotation shaft 300 passes through the central portion, and the other rotor housing 140 ) can be fixedly coupled to the rotation axis 300 in the central part.

At this time, the axial magnetic flux motor 10 may further include a hollow cylinder drum 600 surrounding the outer peripheral surface of the stator 200.

The hollow cylinder drum 600 is coupled to two rotor housings 140 at the upper and lower ends, respectively, and can be configured in various ways as a rotating drum that rotates together with the rotor 100.

Meanwhile, as shown in FIG. 2, the permanent magnets 110 constituting the rotor 100 move from the center (PC) of the back iron 120 to the outer portion (going in the radial direction (RD)). Since it is formed in a fan-shaped or trapezoidal shape with increasing width, the area of the permanent magnet portion 110 increases toward the outer portion of the back iron 120, and as a result, the strength of the magnetic force by the permanent magnet 110 can be increased.

In order to compensate for this, the thickness T of the back iron 120 may become thicker as it goes from the center PC on the plane of the back iron 120 in the radial direction RD.

As an example, at least one step 123 may be formed on the back surface S2 of the back iron 120 facing away from the stator 200.

The thickness (T) of the back iron 120 may vary based on the step 123.

The steps 123 may be provided in plural numbers along the radial direction (RD) of the back iron 120. For example, as shown in FIG. 3, two steps 123 may be provided along the radial direction (RD) between the central inner peripheral surface 121 and the outermost outer peripheral surface 125 of the back iron 120. there is.

The position where the step 123 is formed may be configured in various ways depending on the design.

At this time, the heights K1 and K2 of the plurality of steps 123 may all be formed at the same height, but are not limited thereto.

For example, the height K1 of at least one of the plurality of steps 123 may be formed to have a height different from the height K2 of the other steps 123.

More specifically, the plurality of steps 123 may be formed to have lower heights in the radial direction (RD) of the back iron 120.

In addition to the embodiment in which a step 123 is formed on the back surface (S2) of the back iron 120 and the thickness of the back iron 120 is discontinuously varied, the thickness (T) of the back iron 120 is changed as shown in FIG. 4. An embodiment in which is continuously varied is also possible.

For example, on the back surface (S2) of the back iron 120, an inclined surface 127 is inclined in the radial direction (RD) of the back iron 120 so that the thickness (T) of the back iron 120 becomes thicker. This can be formed.

The back surface (S2) of the back iron 120 may be provided with at least one of a step 123 and an inclined surface 127, and the step 123 and an inclined surface (inclined surface) may be provided in various combinations.

Meanwhile, the back iron 120 has a structure in which thin electrical steel sheets are wound and laminated, and the steps 123 or inclined surfaces 127 of the back surface S2 can be processed in various ways.

For example, the step 123 or the inclined surface 127 can be formed by winding a thin electrical steel plate into a flat disk shape and then cutting or grinding the back surface S2 of the back iron 120. there is.

As another example, the step 123 or the inclined surface 127 may be formed by processing thin electrical steel sheets into a pre-designed shape and then winding and stacking them.

The stator 200 is a stator that faces the rotor 100 and includes a plurality of field coil parts 210, and can be configured in various ways.

The field coil units 210 may be arranged in the circumferential direction (CD) around the rotation axis direction (R) of the axial magnetic flux motor 10.

The field coil unit 210 may include a stator core and a winding coil wound around the stator core.

The stator core is an iron core for field formation and can be configured in various ways.

At this time, the stator 200 is configured to support and fix a plurality of field coil parts 210, and includes a hollow stator hub 220 in which a second through hole 222 is formed in the center, and the stator hub It may include a plurality of spokes 230 extending radially outward from the outer peripheral surface of 220.

As shown in FIGS. 8 and 9, the stator hub 220 may be a hollow cylindrical body in which a second through hole 222 through which the rotation shaft 300 passes is formed.

The plurality of spokes 230 extend radially outward from the outer peripheral surface of the stator hub 220 and can be configured in various ways.

The plurality of spokes 230 may extend radially on the outer surface of the stator hub 220 to form a spoke shape.

The plurality of spokes 230 may be provided at equal intervals along the circumferential direction (CD) on the outer surface of the stator hub 220.

In each space between neighboring spokes 230, the field coil part 210 can be fixed and supported through various fixing means such as epoxy and bolting means, and there is a space between the spokes 230 and the field coil part 210 for insulation. Insulating paper may be provided.

On the upper and lower surfaces of the spoke 230 exposed between neighboring field coil parts 210, there are protrusions to increase stability when fixing the field coil part 210 using epoxy and to increase cooling efficiency by increasing the cross-sectional area. Structure 232 may be formed.

The rotation shaft 300 is a shaft member coupled to the rotor 100 and rotatably installed through the second through hole 222 in the center of the stator 200, and can have various configurations.

Referring to FIG. 10, the rotating shaft 300 is a hollow cylindrical shaft having a length along the axial direction (R), and at one end in the longitudinal direction, a rotating shaft flange 302 coupled to the rotor housing 140 extends in the radial direction. You can.

The axial magnetic flux motor 10 according to the present invention may include one or more bearings 400 installed between the rotation shaft 300 and the stator 200.

The rotation shaft 300 can stably rotate with respect to the stator 200 through the bearing 400.

For example, the bearings 400 may be provided as a pair.

The pair of bearings 400 may be installed to be spaced apart from each other at a preset distance (DT) along the axial direction (R) of the rotation shaft (300).

The bearing 400 may be a ball bearing, and specifically, an inner ring 410 in close contact with the outer peripheral surface of the rotating shaft 300, an outer ring 420 disposed on the radial outer side at a distance from the inner ring 410, and an inner ring ( 410 may include a plurality of ball members 430 disposed along the circumferential direction between the inner ring 410 and the outer ring 420 so that it can rotate.

The area where the rotating shaft 300 and the bearing 400 are coupled is a bearing coupling area (BC), which may refer to an area in close contact with the inner ring of the bearing 400.

At this time, the bearing coupling area BC may be formed to have dimensions different from other areas of the rotating shaft 300.

In other words, the tolerance of the rotating shaft 300 in the bearing coupling area BC may be formed differently from the tolerance of other areas.

By designing tolerances differently depending on the area of the rotation shaft 300, installation/assembly of the bearing 300 can be implemented more easily.

More specifically, the tolerance of the bearing coupling area BC of the rotating shaft 300 may be formed to be smaller than the tolerance of other areas. For example, the tolerance in the bearing coupling area (BC) may be ±0.008 and the tolerance in other areas may be designed to be larger -0.04 to -0.06.

When the bearings 400 are provided as a pair, another area of the rotating shaft 300 designed with different dimensional tolerances is formed between the two bearing coupling areas BC where the pair of bearings 400 are coupled. It can mean area.

At this time, the axial flux motor 10 may further include a spacer 500 installed between the pair of bearings 400 to support the pair of bearings 400.

The spacer 500 is a hollow cylindrical member installed between a pair of bearings 400 and may be coupled to the outer peripheral surface of the rotating shaft 300.

The spacer 500 may have a first through hole 502 formed in the center through which the rotation axis 300 passes.

The inner peripheral surface of the first through hole 502 of the spacer 500 may be in close contact with the outer peripheral surface of the rotating shaft 300.

The axial direction (R) length of the spacer 500 may be the same as the distance DT formed by the pair of bearings 400.

As shown in FIG. 9, both ends of the spacer 500 may be installed to respectively support the inner rings 410 of the pair of bearings 400. Meanwhile, the detailed structures of the stator 200, bearing 400, and spacer 500 of FIG. 9 are not shown in FIG. 1, but may be configured the same or similar to FIG. 9.

Since the spacer 500 and the bearing 400 are arranged in a row along the axial direction (R) of the rotating shaft 300, the surface formed at one end of the space 500 and the end of the inner ring 410 of the bearing 400 The inner ring 400 of the bearing 400 can be supported by the surface formed in close contact.

When the rotating shaft 300 rotates at high speed, a load may be applied to the inner ring 410 of the bearing 400, and the spacer 500 supports the inner ring 410 of the bearing 400 to maintain the bearing 400. This can reduce the load received.

In addition, in order to reduce the load received by the outer ring 420 of the bearing 400, the stator 200 includes the spacer 500 and the stator hub ( 220) may further include a bushing member 240 installed between them.

At this time, a groove 229 recessed along the circumferential direction may be formed on the inner peripheral surface of the second through hole 222 of the stator hub 220 to form a hub passage portion 224, which will be described later.

The bushing member 240 is installed in the second light hole 222. More specifically, the bushing member 240 is installed in the groove 229 to cover the open surface of the groove 229 to form the hub passage portion 224. Can be coupled to the open side of.

An O-ring member (O) may be installed between the coupling surface of the bushing member 240 and the stator hub 220 to prevent the refrigerant flowing through the hub passage portion 224 from leaking out.

One or more O-ring grooves 240a formed along the circumferential direction may be formed on the outer peripheral surface of the bushing member 240 to install the O-ring member O.

Referring to FIG. 11, the bushing member 240 may be formed with a step portion 242 whose outer diameter decreases on one end in the longitudinal direction.

A protrusion 227 may be formed on the inner circumferential side of the second through hole 222 of the stator hub 220 at a position corresponding to the step portion 242 and protrudes in a shape that matches the step portion 242.

The O-ring member (O) may be installed on a close contact surface between the protrusion 227 and the step portion 242.

The protrusion 227 is a part that protrudes inward in the radial direction based on the axial direction (R), and one surface of the protrusion 227 (upper surface based on the drawing) is in contact with one end surface of the outer ring 420 of the adjacent bearing 400. The outer ring 420 can be supported.

Additionally, at least one of both ends of the bushing member 240 may be installed to support the outer ring 420 of the bearing 400.

For example, an end of both ends of the bushing member 240 opposite to the step portion 242 may be in contact with one end surface of the outer ring 420 of an adjacent bearing 400 to support the outer ring 420.

As an embodiment, referring to FIG. 8, the outer ring 420 of one of the pair of bearings 400 is supported by one surface of the protrusion 227 of the stator hub 220, and the outer ring 420 of the other bearing 400 is supported by one surface of the protrusion 227 of the stator hub 220. The outer ring 420 of the bearing 400 may be supported by the bushing member 240.

The present invention can effectively reduce the load received by the outer ring 420 of the bearing 400 by the morphological structure of the stator hub 220 and the bushing member 240.

Since the bushing member 240 is fixed to the stator hub 220, it can be installed to be spaced apart from the spacer 500 coupled to the rotating shaft 300 in the radial direction (RD).

Hereinafter, the cooling passage formed in the stator 200 to cool the heat generated in the field coil portion 210 of the stator 200 will be described in detail.

A hub passage portion 224 formed along the circumferential direction of the stator hub 220 may be formed inside the stator hub 220 to allow refrigerant to flow.

The hub passage portion 224 may be a cooling channel formed by a space bordered by the groove 229 of the stator hub 220 and the bushing member 240.

The hub passage portion 224 may form a structure that circulates along the circumferential direction of the stator hub 220.

At this time, the hub passage portion 224 may include a first hub passage 224a and a second hub passage 224b spaced apart in the axial direction (R) of the axial magnetic flux motor 10.

That is, a partition wall 228 provided at the center of the groove 229 may be provided between the first hub passage 224a and the second hub passage 224b to partition the two.

The partition 228 is a part formed integrally with the stator hub 220 and may be a protruding area extending between the first hub passage 224a and the second hub passage 224b.

A first hub passage 224a and a second hub passage 224b will be formed by the space bordered by the groove 229, the partition wall 228, and the bushing member 240 of the stator hub 220, respectively. You can.

Additionally, a spoke passage 232 may be formed inside the plurality of spokes 230, which is in fluid communication with the hub passage portion 224 and extends along the radial direction (RD).

The first hub passage 224a and the second hub passage 224b may each communicate with the spoke passage 232.

At this time, the spoke passage 232 includes a first spoke passage 232a extending outward from the first hub passage 224a in the radial direction (RD), and a first spoke passage 232a extending outward from the second hub passage 224b in the radial direction (RD). ) A second spoke passage (232b) extending outward, and a second spoke passage (232a) fluidly communicating with the first spoke passage (232a) and the second spoke passage (232b) at the outer end in the radial direction (RD) of the spoke 230. It may include a 3-spoke channel (232c).

The first spoke passage 232a is formed in the spoke 230 and extends outward in the radial direction (RD) from the first hub passage 224a and can have various configurations.

The second spoke passage 232b is formed in the spoke 230 and extends outward in the radial direction (RD) from the second hub passage 224b, and can have various configurations.

A first spoke passage 232a and a second spoke passage 232b are formed in each spoke 230, and may be formed to be spaced apart in the axial direction (R) of the axial magnetic flux motor 10.

The third spoke passage 232c may be a passage for fluid communication between the first spoke passage 232a and the second spoke passage 232b at the radial direction (RD) outer end of the spoke 230. .

The first spoke passage 232a, the second spoke passage 232b, and the third spoke passage 232c may be formed by drilling holes in the spokes 230. At this time, of course, the end of the channel opened by drilling can be sealed using a separate sealing cap (not shown).

Since the third spoke passage (232c) fluidly communicates the first spoke passage (232a) and the second spot passage (232b), the fluid flowing through the first hub passage (224a) flows through the first spoke passage (232a) and the third spoke. It may sequentially pass through the flow path 232c and flow into the second hub flow path 224b.

On the contrary, since the third spoke passage (232c) fluidly communicates the first spoke passage (232a) and the second spot passage (232b), the fluid flowing through the second hub passage (224b) flows into the second spoke passage (232a) and the second spoke passage (232a). It is also possible to sequentially pass through the three-spoke passage 232c and flow into the first hub passage 224a, and as a result, a structure in which the refrigerant circulates through the stator hub 220 and the spokes 230 can be formed.

In addition, referring to FIGS. 13 and 14, the stator 200 includes a plurality of channels for dividing the first hub passage portion 224a into a plurality of first hub passage sections A and C along the circumferential direction. It may additionally include first flow path partition walls 250.

In the embodiment of FIG. 13, the stator 200 includes two first passage partition walls 250 so that the first hub passage portion 224a is divided into two first hub passage sections A and C. You can.

The refrigerant flowing in one section (A) of the first hub passage sections (A, C) is blocked by the first passage partition wall 250 and cannot flow to the other section (C), and flows into the second section through the spoke passage 232. It may be in fluid communication with the hub flow path 224b.

Similarly, the stator 200 includes a plurality of second passage partition walls 260 to divide the second hub passage portion 224b into a plurality of second hub passage sections B and D along the circumferential direction. may include.

In the embodiment of FIG. 13, the stator 200 includes two second passage partition walls 260 so that the second hub passage portion 224b is divided into two second hub passage sections B and D. You can.

The refrigerant flowing in one section (B) of the second hub passage sections (B, D) is blocked by the second passage partition wall 260 and cannot flow to the other section (D), and flows into the second hub passage section (232). It may be in fluid communication with the hub flow path 224b.

When the first passage partition wall 250 is provided in two pieces, the two first passage partition walls 250 may be installed to form an angle of 120°.

That is, the angle formed by the two first passage partition walls 250 with respect to the axial direction (R) is 120°, and in the same sense, the angle formed by the two first passage partition walls 250 with respect to the axial direction (R) is 240°. It can be understood as forming an obtuse angle.

Similarly, the angle formed by the two second passage partition walls 260 with respect to the axial direction (R) is 120°, and in the same sense, the angle formed by the two second passage partition walls 260 with respect to the axial direction (R) is 240°. It can be understood as forming an obtuse angle.

Referring to FIG. 14, one of the two first passage partition walls 250 may be installed in a position overlapping with one of the two second flow passage partition walls 260 in the axial direction (R). there is.

The remaining first passage partition wall 250 is positioned at a 120° counterclockwise angle with respect to the first and second passage partition walls 250 and 260 that overlap in the axial direction (R). The remaining second passage partition wall 260 is installed at an angle of 120° clockwise with respect to the first passage partition wall 250 and the second passage partition wall 260 that are overlapped with respect to the axial direction (R). It can be installed in a position that forms.

In this case, the first passage partition wall 250 and the second passage partition wall 260, which do not overlap with respect to the axial direction (R), may also form an angle of 120° with respect to the axial direction (R).

In addition, the stator 200 is connected to a refrigerant inlet pipe 272 connected to the first hub passage 224a to supply the refrigerant, and to the second hub passage 224b to discharge the refrigerant. It may include a refrigerant outflow pipe (274).

FIG. 14 is a diagram schematically illustrating the hub passage portion 224, the spoke passage 232, and the first and second passage partition walls 250 and 260 of FIG. 13, showing the first hub passage section (A, C). and the circulation structure of the refrigerant through the second hub passage sections (B, D).

At this time, the refrigerant inflow pipe 272 is connected to section A, which is one of the first hub flow passage sections (A, C), and the refrigerant outflow pipe 274 is connected to section D, which is one of the second hub passage sections (B, D). can be connected to

For effective refrigerant circulation, when the refrigerant inlet pipe 272 is connected to section A, which is one of the first hub passage sections (A, C), the refrigerant outflow pipe 274 is connected to one of the second hub passage sections (B, D). It may be connected to section A, which is the first hub passage section, to which the refrigerant inlet pipe 272 is connected, and section D, which is the second hub passage section that does not overlap in the axial direction (R).

In the embodiment of Figure 14, the circulation structure of the refrigerant is explained as follows.

The refrigerant flowing through the refrigerant inflow pipe 272 moves in the circumferential direction (CD) inside the stator hub 220 along section A and moves in the radial direction (RD) into the first spoke passage 232a connected to section A. It flows through the third spoke flow path (232c), passes through the second spoke flow path (232b), and can flow into section B located below section A.

The refrigerant flowing into section B moves in the circumferential direction (CD) inside the stator hub 220 along section B, flows in the radial direction (RD) into the second spoke passage 232b connected to section B, and flows into the third spoke passage. It can pass through (232c), pass through the first spoke passage (232a), and flow into section C located at the top of section B.

The refrigerant flowing into section C moves in the circumferential direction (CD) inside the stator hub 220 along section C, flows in the radial direction (RD) into the first spoke passage 232a connected to section C, and flows into the third spoke passage. It can pass through (232c), pass through the second spoke passage (232b), and flow into section D located at the top of section C.

The refrigerant flowing into section D moves in the circumferential direction (CD) inside the stator hub 220 along section D and can be discharged through the connected refrigerant outflow pipe 274 after circulation.

In the present invention, the refrigerant alternates between a plurality of first hub passage sections (A, C) and second hub passage sections (B, D), that is, a first hub passage section 224a and a second hub passage section 224b. The cooling efficiency of the stator 200 can be maximized by forming an even circulation structure by alternating multiple times.

The above is only a description of some of the preferred embodiments that can be implemented by the present invention, and therefore, as is well known, the scope of the present invention should not be construed as limited to the above embodiments, and the scope of the present invention as described above should not be construed. Both the technical idea and the technical idea underlying it will be said to be included in the scope of the present invention.

10: motor
100: rotor
200: Stater
300: rotation axis

Claims (10)

A rotor 100 including a plurality of permanent magnets 110; A stator 200 facing the rotor 100 and including a plurality of field coil units 210; An axial magnetic flux motor (10) coupled to the rotor (100) and including a rotation shaft (300) rotatably installed through the central portion of the stator (200),
It includes one or more bearings 400 installed between the rotation shaft 300 and the stator 200,
The axial magnetic flux motor (10), wherein the bearing coupling area (BC) to which the bearing (400) is coupled among the rotating shaft (300) is formed to have different dimensions from other areas. In claim 1,
The axial magnetic flux motor (10), wherein the rotor (100) is provided as a pair with the stator (200) sandwiched between them. In claim 1,
The bearings 400 are provided as a pair,
The axial magnetic flux motor (10), wherein the pair of bearings (400) are installed to be spaced apart at a preset distance (DT) along the axial direction (R) of the rotation shaft (300). In claim 3,
The axial magnetic flux motor 10 further includes a spacer 500 installed between the pair of bearings 400 to support the pair of bearings 400. Motor (10). In claim 4,
An axial magnetic flux motor (10), wherein both ends of the spacer (500) are installed to respectively support the inner rings (410) of the pair of bearings (400). In claim 4,
The spacer 500 is an axial magnetic flux motor 10, characterized in that a first through hole 502 through which the rotation shaft 300 passes is formed in the central portion. In claim 4,
The stator 200 includes a hollow stator hub 220 with a second through hole 222 formed in the center, and a plurality of spokes 230 extending radially outward from the outer peripheral surface of the stator hub 220. An axial flux motor (10) comprising: In claim 7,
The stator 200 further includes a bushing member 240 installed between the spacer 500 and the stator hub 220 within the second through hole 222 of the stator hub 220. An axial flux motor (10). In claim 8,
An axial magnetic flux motor (10), wherein at least one of both ends of the bushing member (240) is installed to support the outer ring (420) of the bearing (400). In claim 9,
The stator hub 220 is provided with a step portion 224 that protrudes radially inward from the second through hole 222 to support the outer ring 420 of the bearing 400. Flux motor (10).

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