CN213990461U - Permanent magnet synchronous motor and compressor with same - Google Patents

Abstract

The utility model discloses a PMSM and have its compressor belongs to motor technical field. The utility model discloses a PMSM includes stator and rotor, the stator includes stator core, the last intervalve that link up along the axial that is equipped with of stator core, the rotor rotationally set up in the intervalve, stator core with clearance delta between the rotor satisfies: t/delta is more than or equal to 40 and less than or equal to 150, wherein T is the working condition load of the permanent magnet synchronous motor. The utility model discloses a PMSM designs the clearance size between stator core and the rotor according to the operating mode load of motor actual work, reduces the size and the distribution proportion of the iron loss and the copper loss of motor during operation, and then promotes PMSM's efficiency under specific operating mode load.

Description

Permanent magnet synchronous motor and compressor with same

Technical Field

The utility model relates to the technical field of motors, concretely relates to PMSM and have its compressor.

Background

The motor is a rotating electric machine that converts electrical energy into mechanical energy. The motor generally comprises a stator and a rotor, wherein the stator of the motor comprises a stator core, a winding and an insulating material, the electronic rotor comprises a rotor core and a permanent magnet (and/or cast aluminum), and the permanent magnet synchronous motor has the characteristics of high efficiency, large output torque, adjustable rotating speed, small size and the like, so that the permanent magnet synchronous motor is widely applied to a plurality of fields at present and has a good application effect.

The permanent magnet synchronous motor is influenced by a plurality of structural parameters in the design process, such as the tooth width of a stator, the width of a stator yoke, the inner diameter of the stator, the gap between a stator and a rotor, the thickness of magnetic steel and the like. In general, in order to ensure the output capacity of the electric machine, i.e., to ensure sufficient air gap flux density, the electric machine has a large torque density. However, the size and distribution proportion relationship of iron loss and copper loss during the operation of the motor are affected by the sizes of the gaps between the stator and the rotor, and further the working efficiency of the motor is affected. Therefore, the high-efficiency operation of the motor can be guaranteed according to the different actual operation conditions of the motor and the structural sizes of the motor and the reasonable design.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough of prior art, the embodiment of the utility model provides a PMSM and have its compressor, its actual motion operating mode load according to the motor sets up the clearance between stator core and the rotor, and then effectively promotes PMSM's under the specific operating mode efficiency, reduces motor copper loss and iron loss.

In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a permanent magnet synchronous motor, including stator and rotor, the stator includes stator core, be equipped with the intermediate hole that link up along the axial on the stator core, the rotor rotationally set up in the intermediate hole, stator core with clearance δ between the rotor satisfies: t/delta is more than or equal to 40 and less than or equal to 150, wherein T is the working condition load of the permanent magnet synchronous motor.

Optionally, the stator further includes a winding, a plurality of stator slots are circumferentially disposed on the stator core, a stator tooth is disposed between two adjacent stator slots, and the winding passes through the stator slots on two sides of the stator tooth and is wound around the stator tooth.

Optionally, the rotor includes a rotor core and a magnetic body, the rotor core is rotatably disposed in the middle hole, and the magnetic body is circumferentially disposed on the rotor core.

Optionally, a magnet slot is arranged on the rotor core, and the magnet is arranged in the magnet slot;

alternatively, the first and second electrodes may be,

the magnetic body is attached to the outer circumference of the rotor core;

alternatively, the first and second electrodes may be,

the magnetic body is annular, the magnetic body cover is located on rotor core's the outer circumference.

Optionally, a plurality of the magnetic bodies are included, the plurality of the magnetic bodies are uniformly distributed along the circumferential direction of the rotor core, and two adjacent magnetic bodies have different polarities;

alternatively, the first and second electrodes may be,

the magnetic body has a plurality of sections of polarity sections in the circumferential direction of the rotor core, and two adjacent polarity sections have different polarities.

Optionally, the height of the stator core is equal to the height of the rotor core.

Optionally, the height H of the stator core satisfies: h/delta is more than or equal to 10 and less than or equal to 35.

Optionally, the outer contour area S1 of the stator core and the inner contour area S2 of the stator core satisfy: S1/S2 is more than or equal to 3.5 and less than or equal to 4.4.

Optionally, the thickness K of the magnetic body satisfies: k/delta is more than or equal to 2.35 and less than or equal to 5.7.

In a second aspect, the present invention provides a compressor, including the permanent magnet synchronous motor as described above.

The utility model has the advantages that:

the utility model discloses a permanent magnet synchronous motor, including stator and rotor, the stator includes stator core, be equipped with the intermediate hole that link up along the axial on the stator core, the rotor rotationally set up in the intermediate hole, stator core with clearance delta between the rotor satisfies: t/delta is more than or equal to 40 and less than or equal to 150, wherein T is the working condition load of the permanent magnet synchronous motor. The utility model discloses a PMSM designs the clearance size between stator core and the rotor according to the operating mode load of motor actual work, reduces the size and the distribution proportion of the iron loss and the copper loss of motor during operation, and then promotes PMSM's efficiency under specific operating mode load.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a front view of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a stator core in an embodiment of the present invention;

fig. 4 is a schematic view of a mounting structure of a magnetic body in a first alternative embodiment of the present invention;

fig. 5 is a schematic view of a mounting structure of a magnetic body in a second alternative embodiment of the present invention;

fig. 6 is a schematic view of a mounting structure of a magnetic body in a third alternative embodiment of the present invention;

fig. 7 is a schematic view of a mounting structure of a magnetic body in a fourth alternative embodiment of the present invention;

fig. 8 is a schematic cross-sectional structure diagram of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a permanent magnet synchronous motor according to another embodiment of the present invention;

fig. 10 is a schematic flow chart of a permanent magnet synchronous motor configuration method according to an embodiment of the present invention;

fig. 11 is a detailed flow chart schematic diagram of a permanent magnet synchronous motor configuration method according to an embodiment of the present invention.

Wherein the correspondence between the reference numbers and the names of the components in fig. 1 to 9 is:

1. a stator core; 2. a winding; 3. a middle hole; 4. stator teeth; 5. a stator slot; 6. a rotor core; 7. a magnetic body; 8. a magnet slot; 40. an extension portion; 60. and (5) positioning the blocks.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Referring to fig. 1 and 2, the embodiment of the utility model provides a permanent magnet synchronous motor, including stator and rotor, the stator includes stator core 1, the lead-out wire subassembly, winding 2 and insulating material, be equipped with on stator core 1 along the well centre 3 that the axial link up, the rotor rotationally sets up in well centre hole 3, at the during operation, in order to ensure that the motor has sufficient output capacity, set up certain clearance between stator core 1 and rotor, thereby ensure that the motor has sufficient air gap magnetic density, guarantee that the motor has great torque density, in this embodiment, clearance delta between stator core 1 and the rotor satisfies: t/delta is more than or equal to 40 and less than or equal to 150, wherein T is the working condition load of the permanent magnet synchronous motor, namely the gap between the stator core 1 and the rotor is designed according to the working condition load of the permanent magnet synchronous motor, so that the proportion of copper loss and iron loss of the permanent magnet synchronous motor is adjusted, and the aim of improving the working efficiency of the permanent magnet synchronous motor under a specific working condition is fulfilled. It is understood that the operating load T is determined in N/m as a standard unit and the gap δ is determined in m, and therefore, when determining the relationship that the gap δ between the stator core 1 and the rotor satisfies, the operating load T and the gap δ may be selected to be converted to the standard unit and then compared, or the operating load T and the gap δ may be selected to be converted to the standard unit after being compared, so that a range that is satisfied between the operating load T and the gap δ is obtained.

As shown in fig. 1 to 3, a plurality of stator teeth 4 and stator slots 5 are disposed on the stator core 1, wherein the plurality of stator teeth 4 and stator slots 5 are alternately disposed along the circumferential direction of the stator core 1, that is, along the circumferential direction of the stator core 1, two sides of each stator tooth 4 are respectively disposed with the stator slots 5, and wherein as shown in fig. 1 and 2, the winding 2 is wound on the stator teeth 4 via the stator slots 5 on two sides of the stator teeth 4. In this embodiment, winding 2 establishes the direction for the circumferential direction along stator core 1 to avoid winding 2 to pass through between stator core 1 and the rotor, for the design in the clearance between stator core 1 and the rotor provides the condition, between two adjacent stator teeth 4, two windings 2 share same stator slot 5, have reduced grooved degree of difficulty and cost.

In an alternative embodiment, the contact surface between the stator core 1 and the winding 2 is provided with an insulating material, and the insulating material is used for separating the stator core 1 from the winding 2 to avoid current generation on the stator core 1.

In the circumferential direction of the stator core 1, two sides of the stator teeth 4 are respectively provided with an extension 40, the extension 40 is located at one end of the stator teeth 4 facing the rotor, the extensions 40 of the plurality of stator teeth 4 are connected to form a substantially circular shape, and the extension 40 is located between the stator slot 5 and the rotor to prevent the winding 2 from sliding out of the stator slot 5.

The rotor includes rotor core 6 and magnetic substance 7, and wherein, rotor core 6 rotationally sets up in well centre bore 3, and magnetic substance 7 sets up on rotor core 6 along circumference. When the rotating magnetic field generator works, the winding 2 on the stator core 1 is electrified to form a rotating magnetic field, the magnetic poles of the magnetic body 7 are fixed, the rotating magnetic field generated in the stator core 1 can rotate along with the rotor according to the principle that like poles attract each other and opposite poles repel each other, and finally the rotating speed of the rotor is equal to the rotating speed of the rotating magnetic poles generated in the stator.

In one embodiment, as shown in fig. 1 and fig. 2, the magnetic body 7 is disposed on the outer circumference of the rotor core 6, and at this time, the gap between the stator core 1 and the rotor is the gap between the stator core 1 and the magnetic body 7, that is, in this embodiment, the gap δ between the stator core 1 and the magnetic body 7 satisfies: t/delta is more than or equal to 40 and less than or equal to 150. Specifically, in the present embodiment, a plurality of magnetic bodies 7 are uniformly and intermittently disposed on the outer circumference of the rotor core 6, and adjacent magnetic bodies 7 have different polarities. Further, a plurality of positioning blocks 60 are provided on the outer circumference of the rotor core 6, and when the magnetic body 7 is mounted, the magnetic body 7 is mounted between two adjacent positioning blocks 60 to quickly position the magnetic body 7. In the embodiment of the present invention, the magnetic body 7 can be selectively bonded to the outer wall of the circumference of the rotor core 6 through the colloid.

Fig. 4 shows a schematic view of the installation structure of the magnetic body in the first alternative embodiment of the present invention, in this embodiment, the magnetic body 7 is disposed on the outer circumference of the rotor core 6, wherein the magnetic body 7 is a whole ring structure, and the magnetic body 7 is sleeved on the outer circumference of the rotor core 6. In this embodiment, the magnetic body 7 may be bonded to the circumferential outer wall of the rotor core 6 through a colloid or sleeved on the rotor core 6 through an interference fit. Alternatively, the magnetic body 7 includes a plurality of magnetic segments in the circumferential direction, and adjacent two magnetic segments have different polarities.

In different embodiments, the magnetic body 7 may be selected to be disposed at other positions of the rotor core 6, such as within a circumferential range of the rotor core 6, where the gap between the stator core 1 and the rotor is the gap between the stator core 1 and the rotor core 6. Fig. 5 shows a schematic view of a mounting structure of a magnetic body in a second alternative embodiment of the present invention, and referring to fig. 5, in this embodiment, the magnetic body 7 is disposed within a circumferential range of the rotor core 6 and disposed along a circumferential direction of the rotor core 6, wherein a magnet groove 8 is disposed on the rotor core 6, and the magnetic body 7 is embedded in the magnet groove 8. In the example shown in fig. 5, the magnet slot 8 includes a plurality of, and correspondingly, a plurality of magnetic bodies 7 are respectively embedded in the corresponding magnet slots 8, the magnet slots 8 may be selected to penetrate the rotor core 6 in the axial direction, and the magnetic bodies 7 may be selected to be securely arranged in the magnet slots 7 by interference fit or gluing. In an alternative embodiment, as in the example shown in fig. 4, the magnet slots 8 and the magnetic body 7 may be selected as one body, that is, as one body in the circumferential direction of the rotor core 6, in which case the magnetic body 7 may be selected to have a plurality of magnetic segments of different polarities in the circumferential direction of the rotor core 6.

In the embodiment of the present invention, as shown in fig. 5, the magnet slot 8 and the magnetic body 7 may be selected to be square, and in an alternative embodiment, as shown in fig. 6, the magnet slot 8 and the magnetic body 7 may also be selected to be arc-shaped, wherein, in the example shown in fig. 6, the magnet slot 8 and the magnetic body 7 are arc-shaped curved toward the center of the rotor core 6, and in different embodiments, the magnet slot 8 and the magnetic body 7 may also be selected to be arc-shaped curved toward the radial outward direction of the rotor core 6.

Fig. 7 shows the schematic diagram of the partial structure of the permanent magnet synchronous motor according to the embodiment of the present invention, referring to fig. 7, in this embodiment, in the circumferential direction, the gap between the stator core 1 and the rotor can be selected to be non-uniform, and at this time, the equivalent gap between the stator core 1 and the rotor can be selected, so that the equivalent gap δ' between the stator core 1 and the rotor satisfies: t/delta' is more than or equal to 40 and less than or equal to 150. In alternative embodiments, the unevenness of the gap between the stator core 1 and the rotor may be selected as unevenness of the inner ring of the stator core 1, unevenness of the outer circumference of the rotor core 6, or unevenness of the thickness of the magnetic body 7 in the circumferential direction, and in a preferred embodiment, the unevenness of the thickness of the magnetic body 7 in the circumferential direction may be selected, so that the selection standard of the magnetic body 7 is more flexible, the production difficulty of the permanent magnet synchronous motor is ensured, and the production cost is reduced.

Continuing to refer to fig. 2, in the embodiment of the present invention, the height of stator core 1 is H, wherein, the clearance δ between stator core 1 and the rotor of the permanent magnet synchronous motor, and the height H of stator core 1 satisfy: h/delta is more than or equal to 10 and less than or equal to 35. In the process of designing the motor, according to the specific working condition load of the permanent magnet synchronous motor, in the process of designing the motor, according to the relation between the height H of the stator core 1 and the stator-rotor gap delta, the better stator-rotor gap delta can be reasonably selected according to the height H of the stator core 1, or the better height H of the stator core 1 can be reasonably selected according to the size of the stator-rotor gap delta, so that the purposes of keeping higher motor efficiency, using less motor core materials and reducing cost are achieved.

Referring to fig. 1, in the embodiment of the present invention, the thickness of the magnetic body 7 of the permanent magnet synchronous motor is K, and the gap between the stator core 1 and the rotor of the permanent magnet synchronous motor is δ, wherein the relationship between the thickness K of the magnetic body 7 and the stator-rotor gap δ satisfies: k/delta is more than or equal to 2.35 and less than or equal to 5.7. In the design process of the motor, the thickness K of the rotor magnet is reasonably selected according to the size of the stator and rotor gap delta, so that a certain stator and rotor air gap flux density can be ensured, the flux density of the stator core 1 is reasonably controlled, the iron loss of the stator core 1 is further controlled, the magnetic steel consumption can be ensured to be at a reasonable level, and the purposes of controlling cost and saving materials are achieved.

Referring to fig. 3, in the embodiment of the present invention, the outer contour of the stator core 1 of the pmsm is a circle, and the contour of the central hole 3 is also a circle. The outer contour area of the stator core 1 of the permanent magnet synchronous motor is S1, the contour area of the middle hole 3 of the stator core 1 of the permanent magnet synchronous motor is S2, wherein the following conditions are satisfied between S1 and S2: S1/S2 is more than or equal to 3.5 and less than or equal to 4.4. In the motor design process, the ratio of the outline area of the stator core 1 to the outline area of the middle hole 3 is reasonably designed, so that the permanent magnet synchronous motor can be ensured to have higher motor efficiency, the material consumption of the stator core 1 can be saved, and the purpose of improving the material utilization rate of the motor silicon steel sheet can be achieved.

The utility model discloses PMSM can select for being applied to domestic refrigerator, under the relatively more stable condition of operating mode load at the motor, clearance between the stator and the rotor is designed according to PMSM's operating mode load, thereby improve PMSM's efficiency, reduce the cost of motor, on this basis, according to the stator and the rotor clearance that has obtained, inject stator core 1's height, the thickness of magnetic substance 7 and stator core 1's outline area and the contour area of well hole 3, thereby under the condition that ensures that PMSM has good efficiency, save the consumptive material in the production, and the production cost is reduced.

Referring to fig. 8, in the embodiment of the present invention, the height between the stator core 1 and the rotor core 6 may be selected to be the same. Traditional PMSM, stator core 1 and rotor core 6 have different height more, add man-hour at the production line, need die sinking alone to the part of the height of stator core 1 and the many places of rotor core 6 and carry out the punching sheet, have increased the die sinking cost of production line, in this embodiment, select stator core 1 and rotor core 6 to have the same height to avoid unnecessary die sinking, saved the processing cost. In the example shown in fig. 8, the stator core 1 and the rotor core 6 have the same height therebetween, and the stator core 1 is flush with the surface of the rotor core 6, wherein the magnetic body 7 may be selected to have the same height as the stator core 1 and the rotor core 6.

Referring to fig. 9, in another alternative embodiment, there is a certain misalignment between stator core 1 and rotor core 6, in this embodiment, the surface of magnetic body 7 is flush with the surface of stator core 1 to ensure the electromagnetic induction of magnetic body 7 and winding 2 on stator core 1, at this time, there is a certain misalignment between magnetic body 7 and rotor core 6, and to ensure the fastening of magnetic body 7 and rotor core 6, magnetic body 7 may be selected to be glued or disposed on rotor core 6 by interference fit.

The permanent magnet synchronous motor provided by the embodiment of the utility model can determine the clearance between the stator core 1 and the rotor, the height of the stator core 1, the thickness of the magnetic body 7 and the inner and outer diameter parameters of the stator core 1 aiming at the actual operation working condition load of the motor, thereby effectively improving the efficiency of the permanent magnet synchronous motor under specific working conditions, reducing the consumption of raw materials such as magnetic materials and silicon steel sheets of the motor, and reducing the cost of the motor to a certain extent; according to the utility model discloses PMSM has improved air gap flux density waveform and back electromotive force waveform, reduces tooth's socket torque amplitude and father's love torque fluctuation, is favorable to the reduction of radial electromagnetic force to improve the electromagnetic noise of motor, improved the motor efficiency under the specific load operating mode, had good manufacturability and safe shape simultaneously.

The embodiment of the utility model provides a still provide a compressor, include as above permanent magnet synchronous motor.

Fig. 10 shows a schematic flow chart of a permanent magnet synchronous motor configuration method according to an embodiment of the present invention, referring to fig. 10, an embodiment of the present invention provides a permanent magnet synchronous motor configuration method, including the following steps:

s100, arranging a stator and a rotor, wherein the stator comprises a stator core, the stator core is provided with a middle hole which is through along the axial direction, and the rotor is rotatably arranged in the middle hole;

s200, determining a working condition load T of the permanent magnet synchronous motor;

s300, determining a gap delta between the stator core and the rotor according to the working condition load T, wherein the gap delta between the stator core and the rotor satisfies the following conditions: t/delta is more than or equal to 40 and less than or equal to 150.

The embodiment of the utility model provides an in, the clearance size between stator core and the rotor is designed according to the operating mode load of motor actual work, reduces the size and the distribution proportion of the iron loss and the copper loss of motor during operation, and then promotes PMSM's efficiency under specific operating mode load.

In an alternative embodiment, the gap between the stator core and the rotor is uniformly distributed in the circumferential direction, and the gap δ between the stator core and the rotor is a gap at any position between the stator core and the rotor.

In an optional embodiment, as shown in fig. 11, the permanent magnet synchronous motor configuration method further includes:

s400, determining the height H of the stator core according to the gap delta between the stator core and the rotor, wherein the height H of the stator core meets the following requirements: h/delta is more than or equal to 10 and less than or equal to 35.

The embodiment of the utility model provides an in, the value of stator core's high H is confirmed according to the value of the stator-rotor clearance delta that has obtained to use less motor core material, reduce cost's purpose when reaching the higher motor efficiency that keeps.

In an optional embodiment, the permanent magnet synchronous motor configuration method further comprises:

s500, determining the thickness K of the magnetic body according to the gap delta between the stator core and the rotor, wherein the thickness K of the magnetic body satisfies the following conditions: k/delta is more than or equal to 2.35 and less than or equal to 5.7.

The embodiment of the utility model provides an in, rationally select the thickness K of magnetic substance according to the size of stator and rotor clearance delta, can enough guarantee certain stator and rotor air gap magnetic density, rationally control 1 magnetic density of stator core, and then control 1 iron loss of stator core, also can guarantee that the magnet steel quantity is in a reasonable level, reach control cost, save material's purpose. As is apparent from the above, in an alternative embodiment, the gap between the stator core and the rotor in the circumferential direction may be selected to be non-uniform, in which case the thickness K of the magnetic body may be selected to be non-uniform in the circumferential direction, and in which case the average thickness K of the magnetic body in the circumferential direction may be selected to satisfy 2.35 ≦ K/δ ≦ 5.7.

In an optional embodiment, the permanent magnet synchronous motor configuration method further comprises:

s600, defining an outer contour area S1 of the stator core and a contour area S2 of the middle hole, wherein the outer contour area S of the stator core and the contour area S2 of the middle hole meet the following conditions: S1/S2 is more than or equal to 3.5 and less than or equal to 4.4.

The embodiment of the utility model provides an in, through the injecing to the ratio of 1 outer contour area of stator core and 3 contour area of intermediate hole, can enough guarantee that PMSM has higher motor efficiency, can reach the material quantity of saving stator core 1 again, promote motor silicon steel sheet material utilization's purpose.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a permanent magnet synchronous motor, its characterized in that, includes stator and rotor, the stator includes stator core, be equipped with on the stator core along the middle hole that the axial link up, the rotor rotationally set up in the middle hole, stator core with clearance delta between the rotor satisfies: t/delta is more than or equal to 40 and less than or equal to 150, wherein T is the working condition load of the permanent magnet synchronous motor.

2. The permanent magnet synchronous motor according to claim 1, wherein the stator further comprises a winding, a plurality of stator slots are circumferentially arranged on the stator core, a stator tooth is arranged between two adjacent stator slots, and the winding passes through the stator slots on both sides of the stator tooth and winds around the stator tooth.

3. The permanent magnet synchronous motor of claim 1, wherein the rotor comprises a rotor core rotatably disposed within the central bore and a magnetic body circumferentially disposed on the rotor core.

4. The permanent magnet synchronous motor according to claim 3, wherein the rotor core is provided with a magnet slot, and the magnetic body is disposed in the magnet slot;

alternatively, the first and second electrodes may be,

the magnetic body is attached to the outer circumference of the rotor core;

alternatively, the first and second electrodes may be,

the magnetic body is annular, the magnetic body cover is located on rotor core's the outer circumference.

5. The permanent magnet synchronous motor according to claim 3, comprising a plurality of the magnetic bodies, the plurality of the magnetic bodies being uniformly distributed along a circumferential direction of the rotor core, adjacent two of the magnetic bodies having different polarities;

alternatively, the first and second electrodes may be,

the magnetic body has a plurality of sections of polarity sections in the circumferential direction of the rotor core, and two adjacent polarity sections have different polarities.

6. The permanent magnet synchronous motor of claim 3, wherein the height of the stator core is equal to the height of the rotor core.

7. The permanent magnet synchronous motor according to any one of claims 1 to 6, wherein the height H of the stator core satisfies: h/delta is more than or equal to 10 and less than or equal to 35.

8. The permanent magnet synchronous motor according to any one of claims 1 to 6, wherein an outer contour area S1 of the stator core and an inner contour area S2 of the stator core satisfy: S1/S2 is more than or equal to 3.5 and less than or equal to 4.4.

9. The permanent magnet synchronous motor according to any one of claims 3 to 5, wherein a thickness K of the magnetic body satisfies: k/delta is more than or equal to 2.35 and less than or equal to 5.7.

10. A compressor, characterized by comprising a permanent magnet synchronous motor according to any one of claims 1 to 9.

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