CN117200485A - Rotor, permanent magnet motor and compressor - Google Patents
Rotor, permanent magnet motor and compressor Download PDFInfo
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- CN117200485A CN117200485A CN202311148067.5A CN202311148067A CN117200485A CN 117200485 A CN117200485 A CN 117200485A CN 202311148067 A CN202311148067 A CN 202311148067A CN 117200485 A CN117200485 A CN 117200485A
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- rotor
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- slot
- magnetism isolating
- rotor core
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- 230000005389 magnetism Effects 0.000 claims abstract description 53
- 230000001154 acute effect Effects 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The present disclosure relates to a rotor, a permanent magnet motor and a compressor, the rotor comprising: a rotor core having a center hole, a plurality of magnet slots circumferentially arranged around the center hole, and extending in a radial direction of the rotor core; the permanent magnets are arranged in the magnet grooves in a one-to-one correspondence manner; each magnet slot is formed with a magnetism isolating slot along two sides of the rotor core in the circumferential direction, a magnetic field passage is formed between the magnetism isolating slot and the magnet slot, the magnetism isolating slot is inclined to the radial direction of the rotor core, and the magnetism isolating slot is gradually far away from the magnet slot along the radial direction of the rotor core inwards, so that the width of the magnetic field passage is gradually increased along the radial direction of the rotor core inwards. Permanent magnet machines and compressors include the above-described rotors. The present disclosure can reach saturation state of magnetizing flux, and the required magnetizing voltage is low, so that the magnetizing saturation is easier.
Description
Technical Field
The disclosure relates to the technical field of permanent magnet motors, in particular to a rotor, a permanent magnet motor and a compressor.
Background
The embedded permanent magnet motor is widely applied to various fields due to high power density and high structural strength of a rotor. As in the high performance compressor field, embedded permanent magnet motors remain the preferred option.
In the prior art, an embedded permanent magnet motor applied to a compressor is mainly divided into a radial magnetic field and a tangential magnetic field according to the magnetic field direction, and the magnetic field generated by two sides of a magnetic pole of the tangential magnetic field scheme directly faces an air gap of a stator and a rotor through the magnetic pole, so that the embedded permanent magnet motor has higher magnet utilization rate. However, in the tangential magnetic field scheme, one end of the permanent magnet extends into the vicinity of an inner hole of the rotor, so that the permanent magnet is difficult to saturate after being inserted into the rotor, and the problem of high air gap flux density harmonic content can be caused.
Through retrieval, the prior patent document [ CN 110768421a ] discloses a rotor of a permanent magnet motor, a permanent magnet motor and a compressor, the rotor including a rotor core and a plurality of permanent magnets, the rotor core having a central hole and a plurality of magnet slots arranged along a circumferential direction of the central hole, each of the magnet slots extending along a radial direction of the central hole, a portion of each of the magnet slots located at both radial ends of each of the permanent magnets forming a first magnetism isolating slot. The rotor core is provided with a second magnetism isolating groove on at least one side of the circumference of each magnet groove, the second magnetism isolating groove divides a single-side area where the second magnetism isolating groove is located into a plurality of magnetic field passages distributed along the radial direction, and the minimum width of the magnetic field passage positioned at the radial outer side is smaller than the minimum width of the magnetic field passage positioned at the radial inner side in two adjacent magnetic field passages along the radial direction.
The technical scheme of the patent document has the advantages that the magnetizing flux can reach a saturated state, the problem that the magnetizing flux is difficult to saturate is solved, but the following defects exist in the actual testing process:
the technical scheme needs high magnetizing voltage to reach the saturation state and needs to be improved.
Disclosure of Invention
In order to solve the problems in the prior art, the disclosure aims to provide a rotor, a permanent magnet motor and a compressor. The present disclosure can reach saturation state of magnetizing flux, and the required magnetizing voltage is low, so that the magnetizing saturation is easier.
The present disclosure describes a rotor comprising:
a rotor core having a center hole, a plurality of magnet slots circumferentially arranged around the center hole, and extending in a radial direction of the rotor core;
the permanent magnets are arranged in the magnet grooves in a one-to-one correspondence manner;
each magnet slot is formed with a magnetism isolating slot along two sides of the rotor core in the circumferential direction, a magnetic field passage is formed between the magnetism isolating slot and the magnet slot, the magnetism isolating slot is inclined to the radial direction of the rotor core, and the magnetism isolating slot is gradually far away from the magnet slot along the radial direction of the rotor core inwards, so that the width of the magnetic field passage is gradually increased along the radial direction of the rotor core inwards.
Preferably, two adjacent magnet grooves are defined as a first magnet groove and a second magnet groove respectively, a magnetism isolating groove positioned on one side of the first magnet groove close to the second magnet groove is a first magnetism isolating groove, a magnetism isolating groove positioned on one side of the second magnet groove close to the first magnet groove is a second magnetism isolating groove, the minimum distance between the first magnetism isolating groove and the edge of the central hole is d1, the minimum distance between the first magnetism isolating groove and the second magnetism isolating groove is d2, and the length of the permanent magnet in the radial direction of the rotor is L, so that the length of the permanent magnet in the radial direction of the rotor is as follows:
0.5L≦d1≦L；
0.5L≦d2≦L。
preferably, a symmetry axis between two adjacent permanent magnets is defined as a magnetic pole center line, a central axis which defines the radial same direction of the permanent magnets and the rotor core is defined as a magnet center line, a distance from an axis position of the center hole to an outer edge of the rotor along the magnetic pole center line is R1, and a distance from an axis position of the center hole along the magnet center line to the outer edge of the rotor is R2, so that the following conditions are satisfied:
0.9R1≦R2≦0.98R1。
preferably, the permanent magnet is a rare earth permanent magnet.
Preferably, the permanent magnet is a ferrite permanent magnet.
Preferably, the magnetism isolating groove is a strip-shaped groove.
Preferably, the magnetism isolating slot forms an acute angle with the radial direction of the rotor core towards the inner side of the rotor core, and the acute angle is 10-20 degrees.
The permanent magnet motor comprises the rotor.
Preferably, the permanent magnet motor further comprises a stator, and the rotor is rotationally embedded in the stator.
The compressor comprises the permanent magnet motor.
The rotor, the permanent magnet motor and the compressor have the advantages that the rotor, the permanent magnet motor and the compressor can achieve a magnetizing flux saturation state, the required magnetizing voltage is low, and magnetizing saturation can be achieved more easily. In addition, the harmonic distortion rate of the air gap flux density can be effectively reduced, so that the vibration noise of the motor is reduced, and the high power density can be achieved.
Drawings
FIG. 1 is one of the schematic sectional views of the rotor of the present embodiment taken along the vertical axis of the shaft;
FIG. 2 is a second schematic cross-sectional view of the rotor of the present embodiment taken along the vertical axis of the shaft;
FIG. 3 is a third schematic cross-sectional view of the rotor of the present embodiment taken along the vertical axis of the shaft;
fig. 4 is a schematic structural view of the permanent magnet motor according to the present embodiment;
FIG. 5 is a graph showing a magnetic field distribution when the rotor is magnetized by using a magnetizing tool according to the embodiment;
fig. 6 is a magnetizing graph of the rotor of the present embodiment compared with the rotor of the related art.
Reference numerals illustrate: 1-rotor, 10-rotor core, 11-centre hole, 12-magnet groove, 12 a-first magnet groove, 12 b-second magnet groove, 13-magnetism isolating groove, 13 a-first magnetism isolating groove, 13 b-second magnetism isolating groove, 2-permanent magnet, 3-permanent magnet motor, 31-stator, 4-magnetization frock.
Detailed Description
As shown in fig. 1, a rotor according to the present disclosure includes:
a rotor core 10, the rotor core 10 having a circular center hole 11 formed at a center position thereof, a plurality of magnet grooves 12 formed at an outer side of the center hole 11, the plurality of magnet grooves 12 being circumferentially arranged around the center hole 11, and the magnet grooves 12 extending in a radial direction of the rotor core 10;
the permanent magnets 2 are arranged in the plurality of magnet slots 12 in a one-to-one correspondence manner, the working surfaces of the permanent magnets 2 are generally along the tangential direction of the rotor, at least one magnetism isolating slot 13 is formed in each magnet slot 12 along two sides of the rotor core 10 in the circumferential direction, and a magnetic field passage is formed between the magnetism isolating slot 13 and the magnet slot 12.
The magnetism isolating grooves 13 are inclined to the radial direction of the rotor core 10, and the magnetism isolating grooves 13 are gradually separated from the magnet grooves 12 along the radial direction of the rotor core 10 inwards, namely, two magnetism isolating grooves 13 which are symmetrical at two sides of the magnet grooves 12 are of a structure with inward openings, so that the width of a magnetic field passage is gradually increased along the radial direction of the rotor core 10 inwards.
As shown in fig. 1, an arbitrary point on one magnetism isolating slot 13 other than the end point is taken, the distance between the other point and the corresponding magnet slot 12 is set as D1, another point which is closer to the inner side of the rotor core 10 than the point is taken, the distance between the other point and the corresponding magnet slot 12 is set as D2, and D1< D2 is always satisfied, so that the width of the magnetic field path gradually increases from outside to inside.
Fig. 5 is a magnetic field distribution diagram of the rotor according to the present embodiment when the magnetizing tool 4 is used for magnetizing, as shown in fig. 5, when the magnetizing tool 4 provides strong magnetic lines of force for magnetizing the rotor, the magnetic lines of force in the rotor are blocked by the magnetism isolating grooves 13, and pass through according to a predetermined magnetic field path, and the width of the magnetic field path between the magnetism isolating grooves 13 and the adjacent magnet grooves 12 is integrally set to be increased from outside to inside, so that a saturation region is formed in the magnetic field path region near the outside, and the magnetic lines of force are continuously distributed towards the inside of the rotor, thereby achieving the effect that the permanent magnet 2 near the inside of the rotor can be fully magnetized.
Fig. 6 is a comparative magnetizing graph of the rotor of the present embodiment and the rotor of the prior art under the same magnetizing condition, wherein the rotor defining the conventional tangential magnetic field structure in the background art is comparative technology 1, the rotor structure in the prior patent document [ CN 110768421a ] is comparative technology 2, the rotor structure disclosed in the present disclosure is the present disclosure, and the three rotors are magnetized under the same magnetizing condition, so as to obtain the magnetizing graph shown in fig. 6, and the magnetizing flux of comparative technology 1 is significantly lower than that of the present disclosure and comparative technology 2 in the later period of the steady state, and the state of magnetizing saturation cannot be reached. The magnetizing saturation state can be achieved in both the comparative technique 2 and the application, but the magnetizing saturation state can be achieved when the magnetizing voltage is lower in comparison with the application, and the magnetizing saturation state is obviously easier to achieve in comparison with the comparative technique 2.
Further, in this embodiment, as shown in fig. 2, two adjacent magnet slots 12 are defined as a first magnet slot 12a and a second magnet slot 12b, a magnetism isolating slot 13 located on a side of the first magnet slot 12a close to the second magnet slot 12b is a first magnetism isolating slot 13a, a magnetism isolating slot 13 located on a side of the second magnet slot 12b close to the first magnet slot 12a is a second magnetism isolating slot 13b, a minimum distance between the first magnetism isolating slot 13a and an edge of the central hole 11 is d1, a minimum distance between the first magnetism isolating slot 13a and the second magnetism isolating slot 13b is d2, and a length of the permanent magnet 2 in the radial direction of the rotor is L, so that:
0.5L≦d1≦L；
0.5L≦d2≦L。
therefore, the magnetic field path width is ensured to be enough to realize magnetizing saturation, and the expected saturated region and the expected unsaturated region can be formed, so that the expected purpose is achieved.
The lower the air gap flux density harmonic distortion rate is, the lower the noise vibration is for the permanent magnet motor 3. In order to optimize the air gap flux density of the permanent magnet motor 3, as shown in fig. 3, a symmetry axis between two adjacent permanent magnets 2 is defined as a magnetic pole center line, a central axis of the permanent magnets 2 and the rotor core 10 in the same radial direction is defined as a magnet center line, a distance from an axis position of the central hole 11 to an outer edge of the rotor along the magnetic pole center line is R1, and a distance from the axis position of the central hole 11 to the outer edge of the rotor along the magnet center line is R2, so that:
0.9R1≦R2≦0.98R1。
in the structure, the size of the central line of the magnetic pole is set to be the largest, and the sizes of the two sides of the magnetic pole are gradually reduced, so that the harmonic distortion rate of the air gap flux density can be effectively improved, and meanwhile, the magnetic pole is set to be 0.9R1 less than or equal to R2, and the high power density can be achieved.
Further, in this embodiment, the permanent magnet 2 is a rare earth permanent magnet or a ferrite permanent magnet, and has good magnetism.
Further, in this embodiment, the magnetism isolating slot 13 is a long-strip slot, the magnetism isolating slot 13 forms an acute angle with the radial direction of the rotor core 10 towards the inner side of the rotor core 10, and the acute angle is 10 ° to 20 °, so that the width of the formed magnetic field passage is moderate.
As shown in fig. 4, the embodiment further provides a permanent magnet motor, which includes the rotor, and further includes a stator 31, wherein the rotor is rotationally embedded in the stator 31, and the stator 31 includes a stator core and windings.
The embodiment also provides a compressor comprising the permanent magnet motor.
The method can reach the saturation state of magnetizing flux, and the needed magnetizing voltage is low, so that the magnetizing saturation can be realized more easily. In addition, the harmonic distortion rate of the air gap flux density can be effectively reduced, so that the vibration noise of the motor is reduced, and the high power density can be achieved.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and without being otherwise described, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the application as defined in the claims.
Claims (10)
1. A rotor, comprising:
a rotor core having a center hole, a plurality of magnet slots circumferentially arranged around the center hole, and extending in a radial direction of the rotor core;
the permanent magnets are arranged in the magnet grooves in a one-to-one correspondence manner;
each magnet slot is formed with a magnetism isolating slot along two sides of the rotor core in the circumferential direction, a magnetic field passage is formed between the magnetism isolating slot and the magnet slot, the magnetism isolating slot is inclined to the radial direction of the rotor core, and the magnetism isolating slot is gradually far away from the magnet slot along the radial direction of the rotor core inwards, so that the width of the magnetic field passage is gradually increased along the radial direction of the rotor core inwards.
2. The rotor of claim 1, wherein two adjacent magnet slots are defined as a first magnet slot and a second magnet slot, a magnetism isolating slot positioned at one side of the first magnet slot close to the second magnet slot is a first magnetism isolating slot, a magnetism isolating slot positioned at one side of the second magnet slot close to the first magnet slot is a second magnetism isolating slot, a minimum distance between the first magnetism isolating slot and the edge of the central hole is d1, a minimum distance between the first magnetism isolating slot and the second magnetism isolating slot is d2, and a length of the permanent magnet in the radial direction of the rotor is L, so that:
0.5L≦d1≦L；
0.5L≦d2≦L。
3. the rotor of claim 1, wherein a symmetry axis between two adjacent permanent magnets is defined as a magnetic pole center line, a center axis defining a radial direction of the permanent magnets and the rotor core is defined as a magnet center line, a distance from an axial center position of the center hole along the magnetic pole center line to an outer edge of the rotor is defined as R1, and a distance from an axial center position of the center hole along the magnet center line to the outer edge of the rotor is defined as R2, so that:
0.9R1≦R2≦0.98R1。
4. a rotor according to any one of claims 1-3, characterized in that the permanent magnets are rare earth permanent magnets.
5. A rotor according to any one of claims 1-3, characterized in that the permanent magnets are ferrite permanent magnets.
6. The rotor of claim 1, wherein the magnetically isolated slots are elongated slots.
7. The rotor of claim 6, wherein the magnetism isolating slot forms an acute angle with a radial direction of the rotor core toward an inner side of the rotor core, the acute angle being 10 ° to 20 °.
8. A permanent magnet machine comprising a rotor according to any one of claims 1-7.
9. The permanent magnet machine of claim 8 further comprising a stator, the rotor being rotationally embedded in the stator.
10. A compressor comprising a permanent magnet motor according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311148067.5A CN117200485A (en) | 2023-09-06 | 2023-09-06 | Rotor, permanent magnet motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311148067.5A CN117200485A (en) | 2023-09-06 | 2023-09-06 | Rotor, permanent magnet motor and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117200485A true CN117200485A (en) | 2023-12-08 |
Family
ID=89004637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311148067.5A Pending CN117200485A (en) | 2023-09-06 | 2023-09-06 | Rotor, permanent magnet motor and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117200485A (en) |
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2023
- 2023-09-06 CN CN202311148067.5A patent/CN117200485A/en active Pending
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