Motor and compressor with motor

Abstract

The invention discloses a motor and a compressor with the motor. The motor comprises a stator and a rotor. The rotor is rotatably arranged inside the stator, the outer circumferential surface of the rotor is provided with a plurality of downward concave parts which are arranged at intervals in the circumferential direction of the rotor, protruding parts are formed between every two adjacent downward concave parts, and each protruding part is in transition with the downward concave part adjacent to the protruding part through a step part. According to the embodiment, the motor has the advantages of being low in noise, simple in structure, efficient in performance, easy to manufacture, capable of being produced in batches and the like.

Description

technical field [0001] The invention relates to a driving device, in particular to a motor and a compressor with the motor. Background technique [0002] As one of the main sources of compressor low-frequency noise, the electromagnetic noise of the motor has attracted much attention. The electromagnetic noise of the motor is mainly generated by the radial force wave acting on the stator, and the radial force wave originates from the air gap magnetic field of the motor. The air-gap magnetic field of the existing motor contains a large number of low-order harmonics, and the promotion of these harmonics to the low-frequency radial electromagnetic force is very obvious. [0003] At present, there are many ways to optimize the air gap magnetic field, but all of them have certain defects. For example, reducing the width of the slot of the stator core to reduce the harmonics of the stator teeth, but this method is not conducive to the realization of the stator automatic winding p...

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Problems solved by technology

For example, reducing the width of the slot of the stator core to reduce the harmonics of the stator teeth, but this method is not conducive to the realization of the stator automatic winding process; using the method of uneven air gap to optimize the air gap magnetic field, but increasing Larger tooth harmonics will also cause losses to the fundamental magnetic flux density, and are not conducive to the air gap process inspection of the production line; the use of inclined slots or inclined poles not only weakens the fundamental magnetic flux density, but also makes it difficult to achieve mass production ;Using a concave structure at the q-axis, this method is not optimized because the air-gap magnetic density is not optimized. When the amplitude of the no-load air-gap magnetic density fundamental wave increases, the higher harmonics also increase, so the noise vibration There may be deterioration, and the iron loss tends to increase; two different stator and rotor punches are used to reduce torque ripple and radial electromagnetic force. This form of configuration is too diverse, and it is not suitable for mass production process is unfavorable

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