Electrical equipment, permanent magnet motor and rotor thereof

Abstract

The invention relates to the field of motors, and provides electrical equipment, a permanent magnet motor and a rotor thereof. The rotor comprises an iron core and a plurality of groups of magnetic steels, wherein each group of magnetic steel is distributed in a circumferential array mode; the number of the first group of grooves and the number of the second group of grooves for installing the magnetic steel are equal and are respectively at least two groups; each first group of grooves and each second group of grooves are distributed in a staggered mode in the circumferential direction; the first group of grooves are provided with first inner side grooves and first outer side grooves; and the second group of grooves are provided with second inner side grooves and second outer side grooves; every two adjacent sets of magnetic steel are symmetrically distributed on the two sides of the symmetric face. In the first group of grooves and the second group of grooves which are adjacent in the circumferential direction, the space between the first outer side groove and the symmetrical plane corresponds to a first central angle, the space between the second outer side groove and the symmetrical plane corresponds to a second central angle; and the absolute value of the difference between the first central angle and the second central angle is larger than 0 degree and smaller than 2.5 degrees. Thus, the torque ripple and harmonic content of the permanent magnet motor are reduced, and the performance of the permanent magnet motor is improved.

Description

technical field [0001] The invention relates to the field of motors, in particular to electrical equipment, a permanent magnet motor and a rotor thereof. Background technique [0002] The performance of permanent magnet motors is mainly measured by three indicators: torque, torque ripple and harmonic content. [0003] Among them, the stronger the torque ripple, the stronger the vibration and noise of the permanent magnet motor; the greater the back EMF harmonic content, the more magnetic field harmonics are generated by the magnet in the air gap, and the back EMF harmonics will generate additional in the motor loss resulting in more heat. [0004] In order to increase the torque of the permanent magnet motor, the Chinese utility model patent with the publication number CN208423971U proposes a double-layer V-shaped built-in permanent magnet synchronous motor rotor. The setting of this scheme can effectively improve the torque. However, the permanent The magneto has strong t...

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Problems solved by technology

[0004] In order to increase the torque of the permanent magnet motor, the Chinese utility model patent with the publication number CN208423971U proposes a double-layer V-shaped built-in permanent magnet synchronous motor rotor. The setting of this scheme can effectively improve the torque. However, the permanent The magneto has strong torque ripple and counter electromotive force harmonics, resulting in strong vibration and noise of the permanent magnet motor, the motor is not running smoothly, and the permanent magnet motor has high energy consumption and low efficiency

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