CN211981599U

CN211981599U - Permanent magnet brushless motor

Info

Publication number: CN211981599U
Application number: CN202020445150.4U
Authority: CN
Inventors: 曹平山; 霍州; 郭志发; 单爱进
Original assignee: Suzhou Ruinuomeng New Energy Motor Co ltd
Current assignee: Suzhou Ruinuomeng New Energy Motor Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-11-20
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a permanent magnet brushless motor, which comprises a casing, a stator with a coil winding arranged in the casing, and a rotor which is arranged in the stator and is internally provided with a permanent magnet, wherein the rotor is in running fit with the two ends of the casing through a shaft which is arranged in a rotor inner hole, and comprises two side cover plates and a rotor iron core which is positioned between the two side cover plates and is arranged oppositely; a plurality of magnetic poles are uniformly distributed along the circumferential direction of the rotor core, the magnetic poles on the two oppositely arranged rotor cores are partially arranged in a staggered manner in the vertical direction, the staggered angle is 2 beta, and the range of the 2 beta is 1-6 degrees. The inner rotor core die of the permanent magnet brushless motor is simple, convenient to produce, capable of realizing mass production, capable of reducing torque pulsation and effectively reducing noise and vibration.

Description

Permanent magnet brushless motor

Technical Field

The utility model relates to the field of electric machines, especially, relate to a permanent magnet brushless motor.

Background

With the popularization of new energy automobiles, passengers have higher requirements on comfort, particularly on noise and vibration generated by automobiles. The compressor in the electric vehicle, especially the motor generating power in the compressor, is one of the noise sources, and because it has the characteristic of working for a long time, it is the direction of the engineer to reduce the noise and vibration generated during the operation of the motor.

At present, the motors used by the compressors in the new energy automobiles in the market are mostly permanent magnet brushless motors, rotors of the motors are embedded, the vast majority of the motors are in a traditional straight pole structure, and part of manufacturers use multistage iron cores to realize an oblique pole structure. As shown in fig. 1, the rotor straight pole structure 9 has a large torque ripple, so that the generated noise and vibration are increased, and the comfort of passengers is affected; as shown in fig. 2, a rotor skewed pole structure 10 is formed by splicing a plurality of sections of iron cores, and through the design of a multistage skewed pole structure, torque pulsation is optimized to a certain extent, but because the sections of iron cores are slightly different, a mold becomes complicated and various, the difficulty of production and assembly is increased, and the production efficiency is reduced.

Disclosure of Invention

The utility model aims at providing a permanent magnet brushless motor, this permanent magnet brushless motor inner rotor core mould is simple, and production is convenient, can realize mass production, and can reduce torque ripple, effective noise reduction and vibration.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a permanent magnet brushless motor comprises a casing, a stator with a coil winding arranged in the casing, and a rotor which is arranged in the stator and is internally provided with a permanent magnet, wherein the rotor is in running fit with two ends of the casing through a shaft which is arranged in an inner hole of the rotor in a penetrating way, and comprises two side cover plates and rotor iron cores which are positioned between the two side cover plates and are oppositely arranged;

a plurality of magnetic poles are uniformly distributed along the circumferential direction of the rotor core, the magnetic poles on the two oppositely arranged rotor cores are partially arranged in a staggered manner in the vertical direction, the staggered angle is 2 beta, and the range of the 2 beta is 1-6 degrees.

In the above technical solution, the phase-staggered angle is an included angle between projections of symmetry axes of the two partially staggered magnetic poles in a vertical direction.

In the above technical scheme, a baffle is arranged between two opposite rotor cores.

In the above technical scheme, the baffle is made of a non-magnetic material.

In the technical scheme, the rotor core is provided with the riveting hole used for riveting with the cover plate.

In the above technical scheme, the riveting holes include four, and two of the four riveting holes are opposite and are arranged vertically.

In the above technical solution, the riveting hole includes a first riveting hole, the magnetic pole includes a first magnetic pole disposed opposite to the first riveting hole, and an included angle between a connection line between the first riveting hole and the center of the inner hole of the rotor and a symmetry axis of the first magnetic pole is β.

In the above technical scheme, rotor core one side is the concave surface, rotor core opposite side is the convex surface, two rotor core's convex surface sets up or two relatively rotor core's concave surface sets up.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the utility model discloses in utilize two the same rotor core to set up relatively and form the rotor, simplified the mould of production and processing, reduction in production cost improves production efficiency.

2. When two identical rotor cores are oppositely arranged, the phase-staggered angle between the two is optimized, namely, the skewed pole structure of the rotor is realized, the skewed pole angle is controlled to be 1-6 degrees, the torque pulsation of the motor is effectively reduced, and the noise and the vibration are reduced.

Drawings

FIG. 1 is a prior art rotor straight pole configuration;

FIG. 2 is a prior art rotor skewed pole configuration;

FIG. 3 is a side view of a rotor according to the first embodiment;

FIG. 4 is a top view of a rotor core according to one embodiment;

FIG. 5 is a top view of the rotor according to the first embodiment.

Wherein: 1. a rotor; 2. a rotor core; 3. a magnetic pole; 4. a baffle plate; 5. riveting holes; 6. a first riveting hole; 7. a first magnetic pole; 8. a convex surface; 9. a rotor direct structure; 10. rotor skewed pole structure.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows: referring to fig. 3 to 5, a permanent magnet brushless motor includes a housing, a stator with a coil winding disposed in the housing, and a rotor 1 disposed in the stator and having a permanent magnet inside, wherein the rotor 1 is rotatably engaged with two ends of the housing through a shaft penetrating through an inner hole of the rotor, and the rotor 1 includes two side cover plates and a rotor core 2 disposed between the two side cover plates and disposed oppositely;

a plurality of magnetic poles 3 are uniformly distributed along the circumferential direction of the rotor core 2, the magnetic poles 3 on the two oppositely arranged rotor cores 2 are partially arranged in a staggered manner in the vertical direction, the staggered angle is beta, and the range of the beta is 1-6 degrees.

The two identical rotor cores 2 are spliced together relatively to realize the oblique pole structure of the rotor 1, and the used rotor cores 2 are half of the height of the finished rotor 1 and have the same structures, so that the type of a die and the production process are simplified, mass production is facilitated, the production efficiency is improved, and the production cost is reduced.

Referring to fig. 5, the phase-offset angle is an included angle between projections of symmetry axes of two partially-offset magnetic poles 3 in a vertical direction. When the two rotor cores 2 are oppositely arranged, the phase-staggered angle between the two rotor cores, namely the oblique polar angle, is controlled to be 1-6 degrees, so that the torque pulsation is optimized, and the noise and vibration generated in the running process of the motor are reduced.

In a preferred embodiment, a baffle 4 is disposed between two of the rotor cores 2 facing each other. Specifically, the baffle 4 is made of a non-magnetic material, such as a stainless steel plate, so that the probability of magnetic leakage is reduced.

And a riveting hole 5 for riveting with a cover plate is formed in the rotor iron core 2. The riveting holes 5 comprise four riveting holes, the four riveting holes are vertically arranged in a pairwise opposite mode, the rotor iron cores 2 are connected with the cover plates through rivets arranged in the riveting holes 5, the riveting holes are oppositely arranged, the cover plates are additionally arranged on two sides of the two rotor iron cores 2 with the middle provided with the baffle plates 4, and the two rotor iron cores are fixedly connected through the rivets to achieve the integral oblique pole structure of the rotor 1.

Rotor core 2 one side is the concave surface, 2 opposite sides of rotor core are convex surface 8, two the convex surface 8 of rotor core 2 sets up or two the concave surface of rotor core 2 sets up relatively.

Referring to fig. 4, the riveting holes 5 include first riveting holes 6, the magnetic poles 3 include first magnetic poles 7 disposed opposite to the riveting holes 5, an included angle between a connecting line between the first riveting holes 6 and the center of the rotor inner hole and a symmetry axis of the first magnetic poles 7 is β, when the two rotor cores 2 are disposed opposite to each other, the first riveting holes 6 disposed on the two rotor cores 2 are opposite to each other, and at this time, a phase-to-phase angle between the two first magnetic poles 7 disposed on the two rotor cores 2 is exactly 2 β, which is even if the range of the oblique pole angle of the assembled finished product is controlled.

The beta value of the motor is different according to different pole slot numbers, specifically, in a 6-pole 9-slot motor, the preferred beta range is 1.5-2.5 degrees, the optimal beta is 2 degrees, the counter potential 5 subharmonic after optimization is reduced from 7.4% (direct poles) to 2.8% (beta is 2 degrees), the counter potential 7 subharmonic is reduced from 3.3% (direct poles) to 1.2% (beta is 2 degrees), and the reacted torque pulse is also reduced by about 45 percent; in an 8-pole 12-slot motor, the preferred beta range is 1-2 degrees, and the optimal beta is 1.5 degrees; in a 10-pole 12-slot motor, the preferred beta range is 0.8-1.5 degrees, and the most preferred beta is 1.2 degrees.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a permanent magnet brushless motor, includes the casing, set up in the stator that has coil winding in the casing, set up in the stator and the rotor of built-in permanent magnet, the rotor is through wearing the axle of adorning in the rotor hole and casing both ends normal running fit, its characterized in that: the rotor comprises two side cover plates and a rotor iron core which is positioned between the two side cover plates and is arranged oppositely;

2. The permanent magnet brushless motor of claim 1, wherein: the phase-staggered angle is an included angle between projections of symmetrical axes of the two partially staggered magnetic poles in the vertical direction.

3. The permanent magnet brushless motor of claim 1, wherein: and a baffle is arranged between the two opposite rotor cores.

4. The permanent magnet brushless motor of claim 3, wherein: the baffle is made of non-magnetic materials.

5. The permanent magnet brushless motor of claim 1, wherein: and the rotor core is provided with a riveting hole for riveting with the cover plate.

6. The permanent magnet brushless motor of claim 5, wherein: the riveting hole includes four, and it is two liang of relative perpendicular settings that are.

7. The permanent magnet brushless motor of claim 5, wherein: the riveting holes comprise first riveting holes, the magnetic poles comprise first magnetic poles which are arranged opposite to the first riveting holes, and an included angle between a connecting line of the first riveting holes and the center of the inner hole of the rotor and a symmetry axis of the first magnetic poles is beta.

8. The permanent magnet brushless motor of claim 1, wherein: rotor core one side is the concave surface, rotor core opposite side is the convex surface, two rotor core's convex surface sets up or two rotor core's concave surface sets up relatively.