Low-torque ripple built-in permanent magnet motor rotor and method for optimizing magnetic flux density of motor

A permanent magnet motor and torque fluctuation technology, which is applied in the manufacture of motor generators, magnetic circuit rotating parts, magnetic circuits, etc., can solve the problem of poor air gap flux density waveform quality, additional cost, and increased stator core and Problems such as rotor core harmonic loss can be achieved to reduce vibration and noise, reduce cogging torque, and reduce harmonic loss
CN107294243APending Publication Date: 2017-10-24TANGSHAN PULIN YIWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
TANGSHAN PULIN YIWEI TECH CO LTD
Publication Date
2017-10-24

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Abstract

The invention relates to a low-torque ripple built-in permanent magnet motor rotor and a method for optimizing the magnetic flux density of a motor, belonging to the technical field of permanent magnet motors. A permanent magnet under a magnetic pole consists of two line-shaped permanent magnets (3) and one V-shaped permanent magnet (2), the V-shaped permanent magnet (2) is in the middle, and the two line-shaped permanent magnets (3) are arranged at the two sides of the V-shaped permanent magnet to form an M-shaped magnetic circuit structure integrally. 2p M-shaped magnetic steel grooves (4) are uniformly distributed on the whole rotor iron core (1) in a circle, wherein p refers to permanent magnet motor pole pair, and the two line-shaped permanent magnets (3) and the V-shaped permanent magnet (2) are arranged in the M-shaped magnetic steel grooves. By means of the uniform air gap, the manufacturing difficulty of the motor is not increased, the manufacturing technology of the motor is not changed, the harmonic content in the air gap magnetic field can be effectively reduced, the motor harmonic loss can be reduced, the motor efficiency is improved, the motor gullet torque is reduced, and the vibration and noise of the permanent magnet motor is reduced.
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Description

technical field

[0001] The invention relates to a low-torque fluctuation built-in permanent magnet motor rotor and a method for optimizing the magnetic density of the motor, belonging to the technical field of permanent magnet motors. Background technique

[0002] The air-gap flux density waveform generated by the permanent magnets of the frequency conversion permanent magnet motor is similar to a square wave, which makes the air-gap magnetic field contain a large number of harmonics. When the rotor structure is not designed properly, the harmonic content in the air-gap magnetic field will be more Large, increases the harmonic loss in the stator core and rotor core, reduces the efficiency of the permanent magnet motor, and causes the waveform quality of the air gap flux density to deteriorate. In addition, harmonic currents and harmonic magnetic fields will also generate additional torque fluctuations, which will cause vibration and noise in the motor. Although some other m...

Claims

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