CN105914921B - Quadrature axis inductance it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor - Google Patents

Abstract

The invention discloses an adjustable magnet permanent magnet synchronous motor rotor with variable quadrature axis inductance, belonging to the technical field of permanent magnet motor rotors. The invention aims to solve the problem that the efficiency of the system will be reduced due to the non-adjustable excitation of the permanent magnet motor, and its field-weakening speed regulation when the permanent magnet motor operates above the rated speed. It forms a magnetic field weakening unit through slide rail slots, magnetic isolation slots, springs and magnetic conductive blocks. The magnetic field weakening units are located on the d-axis centerline of each pole and are evenly distributed along the circumferential direction of the rotor core. 2n permanent magnets axially pass through the slots. It is distributed symmetrically on the left and right sides of the field-weakening unit; a permanent magnet with a matching shape is embedded in the axial passage slot of each permanent magnet; except for the adjacent permanent magnets on both sides of the field-weakening unit, the other permanent magnets adjacent to each pole There is a magnetic bridge between them. The invention is a permanent magnet synchronous motor rotor structure.

Description

Adjustable magnet permanent magnet synchronous motor rotor with variable quadrature axis inductance

technical field

The invention relates to an adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance, and belongs to the technical field of permanent magnet motor rotors.

Background technique

The direct-axis magnetic circuit of the permanent magnet motor passes through the permanent magnet with a large reluctance, so the direct-axis inductance is smaller than the quadrature-axis inductance. According to the permanent magnet synchronous motor torque equation, T _e = p[ψ _f i _q + (L _d -L _q )i _d i _q ], where T _e is the electromagnetic torque of the permanent magnet synchronous motor, and p is the number of pole pairs of the motor , ψ _f is the flux linkage generated by the permanent magnet, i _q is the quadrature axis current of the stator winding, L _d is the direct axis inductance of the stator winding, L _q is the quadrature axis inductance of the stator winding, _id is the direct axis current of the stator winding, When the motor is running below the rated speed, a small negative direct-axis current is passed through, so that the electromagnetic torque obtains positive permanent magnet torque and positive reluctance torque. Since the excitation of the permanent magnet cannot be adjusted, the motor must perform field weakening control when the motor is running above the rated speed. The traditional method increases the input negative direct axis demagnetization current and uses the demagnetization effect of the armature reaction to weaken the air gap magnetic field of the motor. , which is equivalent to directly weakening the excitation magnetic field to achieve the purpose of weakening the magnetic field and increasing the speed. The increase of the direct-axis current will inevitably lead to the decrease of the quadrature-axis current. According to the torque equation, the permanent magnet torque decreases rapidly, while the reluctance torque does not increase significantly because the direct-axis current increases but the quadrature-axis current decreases. Therefore, The total electromagnetic torque drops rapidly.

As mentioned above, since the excitation of the permanent magnet cannot be adjusted, the armature reaction generated by the negative d-axis current cancels the magnetic flux generated by the permanent magnet. The efficiency is reduced, and the polarity of the direct-axis armature reaction flux is opposite to that produced by the permanent magnet, and there is a danger of irreversible demagnetization of the permanent magnet. This will limit the application range of permanent magnet synchronous motors. According to the formula of the ideal maximum speed that can be achieved when the motor is under field-weakening control, Among them, n _max is the ideal maximum speed, u _lim is the voltage limit value in the dq axis system, U _lim is the effective value of the maximum fundamental wave phase voltage of the star-connected motor, i _lim is the current limit value in the dq axis system of the motor, i _lim ² =i _d ² +i _q ² , in order to obtain a higher speed, a larger direct axis inductance. The larger the direct axis inductance, the stronger the demagnetization effect of the armature reaction and the better the field weakening effect. However, in the permanent magnet motor of the traditional structure, the permanent magnets are connected in series in the direct-axis magnetic circuit, the permeance of the permanent magnet is small, and the direct-axis inductance is small. ideal. The rotor of a permanent magnet synchronous motor with a traditional structure is shown in Figure 6. The permanent magnets are directly embedded in the slots of the rotor core. The permanent magnets are magnetized radially, and the magnetic isolation slots arranged between the permanent magnets can be used to prevent magnetic flux leakage between poles. .

Contents of the invention

The purpose of the present invention is to solve the problem that the efficiency of the system will decrease due to the non-adjustable excitation of the permanent magnet motor when it is running above the rated speed and the speed regulation of its field weakening, and provides an adjustable magnetic motor with variable quadrature axis inductance. Permanent magnet synchronous motor rotor.

The first technical solution of the present invention: the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance of the present invention, which includes a rotor core, and the rotor core is sequentially connected by 2p eccentric core segments along the circumferential direction Composition, each eccentric core segment is mirror-symmetrically arranged with its radial center line as the axis of symmetry, the outer contour midpoint of each eccentric core segment is the minimum air gap distance point, and the outer contour two points of each eccentric core segment is the point with the maximum air gap distance; where p is the number of pole pairs of the motor;

On each eccentric core segment, 2n permanent magnet axial passage slots and 1 field-weakening axial passage slot are arranged along the circumference near its outer contour side, n is a positive integer; The d-axis centerlines of the core segments coincide, and the 2n permanent magnet axial slots are evenly distributed in mirror symmetry on both sides of the weakened magnetic axial slots, and together with the weak magnetic axial slots, they form a direction toward the rotor core shaft. V-shaped, each permanent magnet axial passage slot is equipped with a permanent magnet; each weak field axial passage slot is composed of a slide rail slot in the middle and a pair of magnetic isolation slots symmetrically arranged on both sides. The radial length of the rail slot is longer than the axial passage slot of the permanent magnet, and its radial length extends toward the outer radial direction of the rotor core. Two springs and a magnetic guide block are arranged in each slide rail slot, and the slide rail slot is close to the rotor core. The bottom surface of the outer contour is used as the bottom of the groove to connect the fixed ends of the two springs. The free ends of the two springs are connected to the magnetic block. The radial length of the magnetic block is the same as that of the permanent magnet axial passage groove. The radial length of the block is the same or the radial length of the magnetic isolation slot is smaller than the radial length of the magnetic permeable block, and the inner diameters of the magnetic permeable block, the magnetic isolation slot and the axial passage slot of the permanent magnet are the same; the center line of the d-axis is the eccentric core segmented radial centerline;

The two ends of each eccentric core segment are respectively provided with pole-spaced magnetic flux slots, and the two pole-spaced magnetic flux slots are mirror-symmetrically arranged with the center line of the d-axis as a symmetrical axis, and each pole-spaced magnetic flux slot is aligned with the corresponding permanent magnet axis Connected to the through groove.

A non-magnetic solid block is arranged in the magnetic isolation groove.

The axial through slot of each permanent magnet is tile-shaped or rectangular.

The second technical solution of the present invention: the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance of the present invention, which includes a rotor core, and the rotor core is sequentially connected by 2p eccentric core segments along the circumferential direction Composition, each eccentric core segment is mirror-symmetrically arranged with its radial center line as the axis of symmetry, the outer contour midpoint of each eccentric core segment is the minimum air gap distance point, and the outer contour two points of each eccentric core segment is the point with the maximum air gap distance; where p is the number of pole pairs of the motor;

On each eccentric core segment, 2n permanent magnet axial passage slots and 1 field-weakening axial passage slot are arranged along the circumference near its outer contour side, n is a positive integer; The d-axis centerlines of the iron core segments coincide, 2n permanent magnet axial passage slots are mirror-symmetrically and evenly distributed on both sides of the weak field axial passage slot, 2n permanent magnet axial passage slots and 1 weak magnetic axial passage slot The arrangement direction of the slots is perpendicular to the center line of the d-axis, and each permanent magnet axial slot is provided with a permanent magnet; each weak field axial slot is arranged symmetrically by the slide rail slot in the middle and its two sides The radial length of the slide rail slot is longer than the axial passage slot of the permanent magnet, and its radial length extends to the outer radial direction of the rotor core, and the slide rail slot is convex, and the top of the convex shape is close to On the outer contour side of the rotor core, two springs and a magnetic guide block are arranged in each slide rail slot. The fixed ends of the two springs are respectively fixed on the platforms on both sides of the slide rail slot. The blocks are connected, and the radial lengths of the magnetic conductive block, the magnetic isolation slot and the axial through slot of the permanent magnet are the same; the center line of the d-axis is the radial center line of the eccentric core segment;

The two ends of each eccentric core segment are respectively provided with pole-spaced magnetic flux slots, and the two pole-spaced magnetic flux slots are mirror-symmetrically arranged with the center line of the d-axis as a symmetrical axis, and each pole-spaced magnetic flux slot is aligned with the corresponding permanent magnet axis Connected to the through groove.

A non-magnetic solid block is arranged in the magnetic isolation groove.

The advantages of the present invention: the present invention can improve the torque performance of the motor, and effectively solve the difficulty of field weakening and speed expansion caused by the unadjustable excitation of the existing permanent magnet motor and the demand for high torque performance of the motor. It forms a magnetic field weakening unit through slide rail slots, magnetic isolation slots, springs and magnetic conductive blocks. The magnetic field weakening units are located on the d-axis centerline of each pole and are evenly distributed along the circumferential direction of the rotor core. 2n permanent magnets axially pass through the slots. Symmetrically distributed on the left and right sides of the field weakening unit. A permanent magnet with matching shape is embedded in the axial through slot of each permanent magnet. Except for the adjacent permanent magnets on both sides of the field-weakening unit, a magnetic bridge is arranged between the adjacent permanent magnets of each pole. The invention is suitable for permanent magnet synchronous motors.

In the present invention, by changing the shape of the rotor, the permanent magnet is segmented, and the magnetic barrier of the quadrature-axis magnetic circuit is set, so that when the motor operates below the rated speed, the direct-axis inductance can be greater than the quadrature-axis inductance; since the quadrature-axis inductance is a variable, with With the movement of the magnetic block, the reluctance of the quadrature-axis magnetic circuit becomes smaller and smaller, and the quadrature-axis inductance becomes larger; when the motor of the present invention operates above the rated speed, only a small negative direct-axis current is needed, and there is no need to greatly reduce the Quadrature axis current, it does not reduce the permanent magnet torque like the traditional permanent magnet synchronous motor under the premise of utilizing the reluctance torque, so the torque performance is improved, and the permanent magnet has no risk of demagnetization; with the increase of the motor speed Change, through the movement of the magnetic block, the magnetic flux emitted by the permanent magnet is closed inside the rotor to achieve magnetic field weakening. The invention avoids the increase of copper loss caused by increasing the negative direct axis current, so the efficiency of the motor can be improved. Compared with the traditional permanent magnet synchronous motor, the direct axis inductance value of the present invention is large, which is beneficial to increase the maximum value of the theoretical speed. Since the quadrature axis is variable and the magnetic field can be adjusted, the equivalent value of the flux linkage emitted by the permanent magnet is reduced, and the motor The overall field weakening effect and the overall ideal maximum speed will be much better than traditional motors.

Description of drawings

Fig. 1 is the structure schematic diagram of the first scheme of the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance according to the present invention; n=3;

Fig. 2 is the structure schematic diagram of the first scheme of the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance according to the present invention; n=1;

Fig. 3 is the structure diagram of the first scheme of the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance according to the present invention; the axial through groove of the permanent magnet is tile-shaped;

Fig. 4 is the structural representation of the second scheme of the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance according to the present invention; n=3;

Fig. 5 is the structural representation of the second scheme of the adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance according to the present invention; n=1;

Fig. 6 is a schematic diagram of the rotor structure of a permanent magnet synchronous motor with a conventional structure.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with Fig. 1 to Fig. 3. The adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance described in the present embodiment includes a rotor core, and the rotor core is formed along the circumferential direction by 2p eccentric core segments are connected in sequence, and each eccentric core segment is mirror-symmetrically arranged with its radial midline as the axis of symmetry, and the midpoint of the outer contour of each eccentric core segment is the minimum point of air gap distance, each The two ends of the outer contour of the eccentric core segment are the points with the largest air gap distance; where p is the number of pole pairs of the motor;

On each eccentric core segment, 2n permanent magnet axial passage slots and 1 field-weakening axial passage slot are arranged along the circumference near its outer contour side, n is a positive integer; The d-axis centerlines of the core segments coincide, and the 2n permanent magnet axial slots are evenly distributed in mirror symmetry on both sides of the weakened magnetic axial slots, and together with the weak magnetic axial slots, they form a direction toward the rotor core shaft. V-shaped, each permanent magnet axial passage slot is provided with a permanent magnet 1; each weak field axial passage slot is composed of a slide rail slot 2 in the middle and a pair of magnetic isolation slots 3 symmetrically arranged on both sides Composition, the radial length of the slide rail slot 2 is longer than the axial passage slot of the permanent magnet, and its radial length extends toward the outer radial direction of the rotor core, and two springs 4 and a magnetic guide block 5 are arranged in each slide rail slot 2 , the bottom surface of the slide rail groove 2 close to the outer contour of the rotor core is used as the bottom of the groove to connect the fixed ends of the two springs 4, the free ends of the two springs 4 are connected to the magnetic block 5, and the magnetic block 5 and the permanent magnet axially pass through the groove The radial length of the magnetic isolation slot 3 is the same as that of the magnetic block 5 or the radial length of the magnetic isolation slot 3 is smaller than the radial length of the magnetic block 5. The magnetic block 5, the magnetic isolation slot 3 and the permanent The inner diameters of the axial through slots of the magnets are the same; the d-axis centerline is the radial centerline of the eccentric core segment;

The two ends of each eccentric core segment are respectively provided with pole-spaced magnetic flux slots 6, and the two pole-spaced magnetic flux slots 6 are mirror-symmetrically arranged with the center line of the d-axis as a symmetrical axis, and each pole-spaced magnetic flux slot 6 is aligned with the corresponding The permanent magnets are connected through the slots in the axial direction.

In this embodiment, except for the axial passage slots of the permanent magnets adjacent to the field-weakening unit, a magnetic bridge is provided between the axial passage slots of the permanent magnets adjacent to each pole. Between the permanent magnets between the poles of the rotor core, the magnetic flux slots 6 between the poles are arranged.

If there is only air in the magnetic isolating groove 3, the height of the magnetic isolating groove will be a little lower than the magnetic conducting block, so that the magnetic conducting block is stuck and fixed, and the imbalance caused by shaking from left to right is avoided. If a solid such as stainless steel is placed in the magnetic isolation slot 3 , the radial length is the same as that of the magnetic permeable block.

When n=1 and p=2, the rotor core of each pole includes two axial through slots of flat permanent magnets. as shown in picture 2. In this case, no magnetic bridge is provided.

Specific Embodiment 2: The present embodiment will be described below with reference to FIG. 1 to FIG. 3 . This embodiment will further describe Embodiment 1, and a non-magnetic solid block is arranged in the magnetic isolation groove 3 .

The magnetic isolation slot 3 can be air or non-magnetic solid.

Embodiment 3: This embodiment will be described below in conjunction with FIG. 3 . This embodiment will further describe Embodiment 1 or 2. The axial through groove of each permanent magnet is tile-shaped or rectangular.

In this embodiment, when n=1 and p=2, 4p tile-shaped through slots form a V shape, and the opening of the V-shaped slot faces the direction of the rotation axis of the rotor core.

Specific Embodiment 4: The present embodiment will be described below in conjunction with Fig. 4 to Fig. 5. The adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance described in the present embodiment includes a rotor core, and the rotor core is formed along the circumferential direction by 2p eccentric core segments are connected in sequence, and each eccentric core segment is mirror-symmetrically arranged with its radial midline as the axis of symmetry, and the midpoint of the outer contour of each eccentric core segment is the minimum point of air gap distance, each The two ends of the outer contour of the eccentric core segment are the points with the largest air gap distance; where p is the number of pole pairs of the motor;

On each eccentric core segment, 2n permanent magnet axial passage slots and 1 field-weakening axial passage slot are arranged along the circumference near its outer contour side, n is a positive integer; The d-axis centerlines of the iron core segments coincide, 2n permanent magnet axial passage slots are mirror-symmetrically and evenly distributed on both sides of the weak field axial passage slot, 2n permanent magnet axial passage slots and 1 weak magnetic axial passage slot The arrangement direction of the slots is perpendicular to the center line of the d-axis, and a permanent magnet 1 is arranged in each permanent magnet axial slot; A pair of magnetic separation slots 3 are symmetrically arranged. The radial length of the slide rail slot 2 is longer than the axial passage slot of the permanent magnet, and its radial length extends toward the outer radial direction of the rotor core, and the slide rail slot 2 is in a convex shape. The top of the convex shape is close to the outer contour of the rotor core. Two springs 4 and one magnetic guide block 5 are arranged in each slide rail slot 2. The fixed ends of the two springs 4 are respectively fixed on the platforms on both sides of the slide rail slot 2. , the free ends of the two springs 4 are connected to the magnetic block 5, the magnetic block 5, the magnetic separation groove 3 and the axial passage groove of the permanent magnet have the same radial length; the d-axis centerline is the section of the eccentric core segment radial midline;

The two ends of each eccentric core segment are respectively provided with pole-spaced magnetic flux slots 6, and the two pole-spaced magnetic flux slots 6 are mirror-symmetrically arranged with the center line of the d-axis as a symmetrical axis, and each pole-spaced magnetic flux slot 6 is aligned with the corresponding The permanent magnets are connected through the slots in the axial direction.

All the axial through slots of the permanent magnets in this embodiment form a square shape, and the center of the square shape is the axis of the rotor core. The slide rail groove in the magnetic field weakening unit is a convex groove, and the fixed ends of the two springs are installed on the middle platform of the convex groove.

Embodiment 5: The present embodiment will be described below with reference to FIG. 4 to FIG. 5 . This embodiment will further describe Embodiment 4, and a non-magnetic solid block is arranged in the magnetic isolation groove 3 .

The permanent magnet in the present invention adopts radial magnetization, and the eccentric shape of the rotor core makes the air gap distance between the axial circumferential surface of the rotor core and the stator core unequal. The air gap distance between the rotor core and the stator core on the d-axis centerline is the smallest, and the air gap distance between the rotor core and the stator core on the q-axis centerline is the largest.

When the motor runs below the rated speed, the magnetic block 5 is located in the slide rail groove 2, radially close to the rotating shaft side, and the spring 4 is in a natural state. When the motor runs above the rated speed, the magnetic block 5 moves along the slide rail groove. 2 Radially move in the direction away from the center of the circle.

The spring 4 in the present invention is a solid spring or a gas spring.

The present invention realizes the principle of promoting torque performance and field weakening as follows:

1. Improve torque performance:

According to the permanent magnet synchronous motor torque formula:

T _e =p[ψ _f i _q +(L _d -L _q )i _d i _q ], 1

where T _e is the electromagnetic torque of the permanent magnet synchronous motor, p is the number of pole pairs of the motor, ψ _f is the flux linkage generated by the permanent magnet, i _q is the quadrature axis current of the stator winding, L _d is the direct axis inductance of the stator winding, L _q is the quadrature axis _inductance of the stator winding, and id is the direct axis current of the stator winding.

According to the torque formula of the traditional permanent magnet synchronous motor, when running below the rated speed, L _d < L _q , the negative direct axis current is passed to it to ensure that the reluctance torque is positive, and the permanent magnet torque is also positive. The total Whether the electromagnetic torque increases depends on the size of the reluctance torque generated by the sacrificed negative direct-axis current and the permanent magnet torque generated by the equivalent direct-axis current. When running above the rated speed, L _d < L _q , plus The large negative direct-axis current makes the permanent magnet torque drop rapidly, the direct-axis current increases and the quadrature-axis current decreases, the reluctance torque cannot be increased, but the permanent magnet torque decreases rapidly, and the total electromagnetic torque rapidly decreases. decline.

In the motor rotor in the present invention, because the slide rail groove in the field weakening unit is located on the center line of the d-axis, there is an air slide rail groove with a large reluctance in the quadrature axis magnetic circuit, so the quadrature axis inductance is very small. The air gap between the rotor and the stator is the smallest at the center line of the direct axis, and the largest air gap is between the rotor core and the stator at the center line of the quadrature axis. There is a magnetic bridge between the adjacent permanent magnets of each pole. The magnetic bridge structure further reduces the direct-axis reluctance of the rotor, so that the direct-axis inductance of the new permanent magnet synchronous motor adopting the rotor structure of the present invention is greater than the quadrature-axis inductance, that is, L _d >L _q . When operating below the rated speed, the magnetic guide block in the magnetic field weakening unit is located at the bottom of the slide rail groove near the center of the circle, and is fixed. The magnetic isolation slots on both sides of the magnetic guide block completely cover the magnetic guide body to reduce leakage. magnetic. Because L _d >L _q , only a small direct-axis current in the forward direction is needed to obtain positive permanent magnet torque and positive reluctance torque. When the speed of the motor exceeds the rated speed, under the action of centrifugal force, the magnetic block in the magnetic field weakening unit runs along the slide rail groove to the outer direction of the circumference, and the area of the magnetic block blocked by the magnetic isolation grooves on both sides of the magnetic block becomes smaller , the reluctance of the magnetic block is very small, and the magnetic block provides a magnetic circuit path for the quadrature-axis magnetic circuit, which increases the quadrature-axis inductance. Therefore, as the speed increases, the greater the moving distance of the magnetic permeable block, the smaller the reluctance of the quadrature-axis magnetic circuit, and the greater the quadrature-axis inductance. Quadrature axis inductance is a function of speed and is a variable. When the quadrature-axis inductance is equal to the direct-axis inductance, _id = 0, all the current is used to generate permanent magnet torque. As the speed increases, the quadrature-axis inductance exceeds the direct-axis inductance, that is, L _d < L _q . According to equation 1, a small negative direct-axis current can ensure that the reluctance torque is positive and operates below the rated speed. The reluctance torque has not decreased compared with the time, and there is still reluctance torque output, and the permanent magnet torque does not increase the negative direct axis current like the traditional permanent magnet synchronous motor, nor does it appear due to the reduction of the quadrature axis current The resulting permanent magnet torque decreases rapidly. Therefore, the total electromagnetic torque is much higher than that of the traditional permanent magnet synchronous motor.

2. Magnetic field weakening mechanism:

When the motor rotor is running below the rated speed, the magnetic block in the field weakening unit is located at the bottom of the slide rail groove near the center of the circle, and is fixed. The magnetic isolation slots on both sides of the magnetic block completely cover the magnetic body to reduce the Small flux leakage. When the speed of the motor exceeds the rated speed, under the action of centrifugal force, the magnetic block in the magnetic field weakening unit runs along the slide rail groove to the outer direction of the circumference, and the area of the magnetic block blocked by the magnetic isolation grooves on both sides of the magnetic block becomes smaller , the reluctance of the magnetic guide block is very small, the magnetic flux emitted by the permanent magnet passes through the magnetic guide block and is closed inside the rotor, the air gap flux decreases, and the greater the distance that the magnetic guide runs in the slide rail groove to the outer direction of the circumference, the greater the guide The larger the area of the magnetic circuit provided by the magnetic block, the more the magnetic flux from the permanent magnet passes through the magnetic block and closes the magnetic flux inside the rotor, the smaller the magnetic flux passing through the air gap, and the better the magnetic field weakening effect. magnetic. In addition, according to the formula of the ideal maximum speed, Among them, n _max is the ideal maximum speed, u _lim is the voltage limit value in the dq axis system, and i _lim is the current limit value in the dq axis system. The direct axis inductance of this motor is larger than that of the traditional motor, which is theoretically It is more beneficial to make the motor reach a higher speed.

Claims (5)

1. a kind of quadrature axis inductance it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor, it includes rotor core, it is characterised in that described Rotor core is along the circumferential direction connected successively by 2p eccentric iron core segmentation to be formed, and each bias is unshakable in one's determination to be segmented with its footpath to the midline Set for symmetry axis in specular, the outline midpoint of each eccentric segmentation unshakable in one's determination is air gap distance smallest point, each eccentric The outline two-end-point of iron core segmentation is air gap distance maximum point；Wherein p is motor number of pole-pairs；

Each eccentric iron core is segmented its upper close outline side circumferentially circumferentially disposed 2n permanent magnet axial pass trough and 1 weak magnetic Axial pass trough, n are positive integer；The center line of weak magnetic axial pass trough overlaps with the d shaft centre lines of eccentric segmentation unshakable in one's determination, 2n permanent magnetism Body axial pass trough is uniformly distributed in the both sides of weak magnetic axial pass trough in mirror symmetry, and is collectively forming direction with weak magnetic axial pass trough The V-shaped of rotor core rotor shaft direction, permanent magnet (1) is provided with each permanent magnet axial pass trough；Each weak magnetic is axially logical Groove is made up of a pair of magnet isolation tanks (3) of the symmetrical setting of sliding-rail groove (2) and its both sides positioned at centre, the radial direction of sliding-rail groove (2) Length is longer than permanent magnet axial pass trough, and its radical length extends to the outer radial direction of rotor core, is set in each sliding-rail groove (2) Two springs (4) and a magnetic inductive block (5) are put, sliding-rail groove (2) is close to the bottom surface of rotor core outline as bottom land connection two The fixing end of individual spring (4), the free end of two springs (4) are connected with magnetic inductive block (5), magnetic inductive block (5) and permanent magnet axial direction The radical length of groove is identical, and magnet isolation tank (3) is identical with the radical length of magnetic inductive block (5) or the radical length of magnet isolation tank (3) Less than the radical length of magnetic inductive block (5)；The d shaft centre lines for eccentric unshakable in one's determination segmentation footpath to the midline；

The both ends of each eccentric segmentation unshakable in one's determination set interpolar respectively, and every magnetic flux groove (6), two interpolars are every magnetic flux groove (6) with d axles Heart line is that symmetry axis is set in specular, and each interpolar is connected every magnetic flux groove (6) with corresponding permanent magnet axial pass trough.

2. quadrature axis inductance according to claim 1 it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor, it is characterised in that every magnetic Non-magnetic solids block is set in groove (3).

3. quadrature axis inductance according to claim 1 or 2 it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor, it is characterised in that Each permanent magnet axial pass trough is in tile shape or rectangle.

4. a kind of quadrature axis inductance it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor, it includes rotor core, it is characterised in that described Rotor core is along the circumferential direction connected successively by 2p eccentric iron core segmentation to be formed, and each bias is unshakable in one's determination to be segmented with its footpath to the midline Set for symmetry axis in specular, the outline midpoint of each eccentric segmentation unshakable in one's determination is air gap distance smallest point, each eccentric The outline two-end-point of iron core segmentation is air gap distance maximum point；Wherein p is motor number of pole-pairs；

Each eccentric segmentation unshakable in one's determination is upper circumferentially to set 2n permanent magnet axial pass trough and 1 weak magnetic axle close to its outline side To groove, n is positive integer；The center line of weak magnetic axial pass trough overlaps with the d shaft centre lines of eccentric segmentation unshakable in one's determination, 2n permanent magnet Axial pass trough is uniformly distributed in the both sides of weak magnetic axial pass trough in mirror symmetry, 2n permanent magnet axial pass trough and 1 weak magnetic axle It is vertical with d shaft centre lines to the arragement direction of groove, permanent magnet (1) is provided with each permanent magnet axial pass trough；It is each weak Magnetic axial pass trough is made up of a pair of magnet isolation tanks (3) of the symmetrical setting of sliding-rail groove (2) and its both sides positioned at centre, sliding-rail groove (2) radical length is longer than permanent magnet axial pass trough, and its radical length extends to the outer radial direction of rotor core, and slide rail Groove (2) is in convex shape, and the convex shape top sets two springs (4) in rotor core outline side, each sliding-rail groove (2) With a magnetic inductive block (5), the fixing end of two springs (4) is individually fixed at the middle both sides platform of sliding-rail groove (2), two bullets The free end of spring (4) is connected with magnetic inductive block (5), magnetic inductive block (5), the radical length of magnet isolation tank (3) and permanent magnet axial pass trough It is identical；The d shaft centre lines for eccentric unshakable in one's determination segmentation footpath to the midline；

The both ends of each eccentric segmentation unshakable in one's determination set interpolar respectively, and every magnetic flux groove (6), two interpolars are every magnetic flux groove (6) with d axles Heart line is that symmetry axis is set in specular, and each interpolar is connected every magnetic flux groove (6) with corresponding permanent magnet axial pass trough.

5. quadrature axis inductance according to claim 4 it is variable can adjustable magnetic permanent-magnetic synchronous motor rotor, it is characterised in that every magnetic Non-magnetic solids block is set in groove (3).