CN211377711U - Permanent magnet punching sheet - Google Patents
Permanent magnet punching sheet Download PDFInfo
- Publication number
- CN211377711U CN211377711U CN202020222285.4U CN202020222285U CN211377711U CN 211377711 U CN211377711 U CN 211377711U CN 202020222285 U CN202020222285 U CN 202020222285U CN 211377711 U CN211377711 U CN 211377711U
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- punching sheet
- air gap
- permanent magnet
- stator punching
- stator
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The utility model discloses a permanent magnet punching sheet, which relates to the field of synchronous motors and mainly comprises a stator punching sheet and a rotor punching sheet, wherein the stator punching sheet is provided with 72 round-bottom pear-shaped grooves; the rotor punching sheet is arranged in the stator punching sheet, an air gap is formed between the rotor punching sheet and the stator punching sheet, and a plurality of pairs of permanent magnet grooves are uniformly distributed along the circumference of the rotor punching sheet; the radius of the pole arc corresponding to each pair of permanent magnet slots is smaller than the radius of the inner circle of the stator punching sheet, so that the minimum air gap is formed at the center of the pole arc, the air gaps are gradually increased along the directions of the two sides of the center line of the pole arc, and the maximum air gap is formed at the edge. The utility model has the advantages that: by changing the thickness of the air gap between the stator and the rotor, the amplitude of the cogging torque is effectively weakened, and the waveform of the air gap flux density is improved, so that the magnetic flux density waveform generated by the permanent magnet in the air gap is close to a sine wave, the harmonic loss of the synchronous motor during operation is reduced, the electromagnetic noise in the operation process is reduced, the performance of the motor is improved, and the efficiency of the motor is improved.
Description
Technical Field
The utility model relates to a synchronous motor's field, concretely relates to permanent magnetism is towards piece.
Background
In the prior art, the speed-adjustable permanent magnet synchronous motor has high efficiency and high power factor, which is accepted by most people, but because the speed-adjustable permanent magnet synchronous motor is mostly used in the air compressor industry, the rotating speed is high, the volume is small, the noise and the temperature rise of the motor are high, and the noise and the temperature rise are unacceptable for motor users.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of prior art existence, and provide a permanent magnetism towards piece, have high efficiency, high performance, the temperature rise is low, the advantage of low noise.
The purpose of the utility model is accomplished through following technical scheme: the permanent magnet punching sheet mainly comprises a stator punching sheet and a rotor punching sheet, wherein the outer diameter of the stator punching sheet is 400mm, the ratio of the inner diameter to the outer diameter is 0.71, 72 round-bottom pear-shaped grooves are formed in the stator punching sheet, and the ratio of the pitch circle at the bottom of the groove bottom to the outer diameter is 0.885; the rotor punching sheet is arranged in the stator punching sheet, an air gap is formed between the rotor punching sheet and the stator punching sheet, the rotor punching sheet adopts uneven outer diameter, a plurality of pairs of permanent magnet grooves for mounting permanent magnets are uniformly distributed along the circumference of the rotor punching sheet, and each pair of permanent magnet grooves form a V-shaped structure with an opening facing the air gap; the radius of the pole arc corresponding to each pair of permanent magnet slots is smaller than the radius of the inner circle of the stator punching sheet, so that the minimum air gap is formed at the center of the pole arc, the air gaps are gradually increased along the directions of the two sides of the center line of the pole arc, and the maximum air gap is formed at the edge.
Preferably, the thickness of the maximum air gap is 1.5 times of the minimum air gap.
The utility model has the advantages that: by changing the thickness of the air gap between the stator and the rotor, the amplitude of the cogging torque is effectively weakened, and the waveform of the air gap flux density is improved, so that the magnetic flux density waveform generated by the permanent magnet in the air gap is close to a sine wave, the harmonic loss of the synchronous motor during operation is reduced, the electromagnetic noise in the operation process is reduced, the performance of the motor is improved, and the efficiency of the motor is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a rotor sheet.
Fig. 3 is a schematic structural diagram of a stator punching sheet.
Description of reference numerals: the stator punching sheet comprises a stator punching sheet 1, a rotor punching sheet 2, a minimum air gap 3, a maximum air gap 4 and a permanent magnet groove 5.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings:
example (b): as shown in the attached drawings, the permanent magnet punching sheet mainly comprises a stator punching sheet 1 and a rotor punching sheet 2, and is characterized in that: the outer diameter of the stator punching sheet 1 is 400mm, the ratio of the inner diameter to the outer diameter is 0.71, 72 round-bottom pear-shaped grooves are formed in the stator punching sheet 1, and the ratio of the pitch circle at the bottom of the groove bottom to the outer diameter is 0.885; the rotor punching sheet 2 is arranged in the stator punching sheet 1, an air gap is formed between the rotor punching sheet and the stator punching sheet, the rotor punching sheet 2 adopts uneven outer diameter, a plurality of pairs of permanent magnet grooves 5 are uniformly distributed along the circumference of the rotor punching sheet 2 and used for mounting permanent magnets, and each pair of permanent magnet grooves 5 form a V-shaped structure with an opening facing the air gap; the radius of the pole arc corresponding to each pair of permanent magnet slots 5 is smaller than the radius of the inner circle of the stator punching sheet 1, and the center of the pole arc is not coincident with the center of the inner circle, so that a minimum air gap 3 is formed at the center of the pole arc, air gaps are gradually increased along the directions of two sides of the center line of the pole arc, a maximum air gap 4 is formed at the edge, and the center of a connecting arc between two adjacent pole arcs is coincident with the center of the inner circle of the stator punching sheet 1.
Preferably, the thickness of the maximum air gap 4 is 1.5 times of the minimum air gap 3.
The utility model discloses a theory of operation: due to the uneven outer diameter design of the rotor punching sheet 2, the thickness of an air gap between a stator and a rotor is changed, the amplitude of a cogging torque is effectively weakened, and the waveform of the magnetic density of the air gap is improved, so that the waveform of the magnetic flux density generated by a permanent magnet in the air gap is close to a sine wave, the harmonic loss of a synchronous motor during operation is reduced, the electromagnetic noise during operation is reduced, the performance of the motor is improved, and the efficiency of the motor is improved.
It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.
Claims (2)
1. The utility model provides a permanent magnetism towards piece, includes stator punching (1) and rotor punching (2), its characterized in that: the outer diameter of the stator punching sheet (1) is 400mm, the ratio of the inner diameter to the outer diameter is 0.71, 72 round-bottom pear-shaped grooves are formed in the stator punching sheet (1), and the ratio of the pitch circle at the bottom of the groove bottom to the outer diameter is 0.885; the rotor punching sheet (2) is arranged in the stator punching sheet (1), an air gap is formed between the rotor punching sheet and the stator punching sheet, the rotor punching sheet (2) adopts uneven outer diameter, a plurality of pairs of permanent magnet grooves (5) are uniformly distributed along the circumference of the rotor punching sheet (2) and used for mounting permanent magnets, and each pair of permanent magnet grooves (5) form a V-shaped structure with an opening facing the air gap; the radius of the pole arc corresponding to each pair of permanent magnet slots (5) is smaller than the radius of the inner circle of the stator punching sheet (1), so that the minimum air gap (3) is formed at the center of the pole arc, the air gaps are gradually increased along the directions of two sides of the center line of the pole arc, and the maximum air gap (4) is formed at the edge.
2. The permanent magnet punching sheet according to claim 1, characterized in that: the thickness of the maximum air gap (4) is 1.5 times of the thickness of the minimum air gap (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020222285.4U CN211377711U (en) | 2020-02-27 | 2020-02-27 | Permanent magnet punching sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020222285.4U CN211377711U (en) | 2020-02-27 | 2020-02-27 | Permanent magnet punching sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211377711U true CN211377711U (en) | 2020-08-28 |
Family
ID=72157297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020222285.4U Active CN211377711U (en) | 2020-02-27 | 2020-02-27 | Permanent magnet punching sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211377711U (en) |
-
2020
- 2020-02-27 CN CN202020222285.4U patent/CN211377711U/en active Active
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