Rotor structure of permanent magnet synchronous motor

Abstract

The invention provides a rotor structure of a permanent magnet synchronous motor. The end surface of a rotor is provided with a plurality of V-shaped magnetic steel grooves (1) which extend in the length direction of a rotor and are distributed in the circumferential direction, the V-shaped magnetic steel grooves (1) are distributed at equal intervals, and the V-shaped opening directions of the V-shaped magnetic steel grooves (1) face the outer diameter of the rotor; magnetic steel (2) is arranged in each V-shaped magnetic steel groove (1); and a magnetic isolation magnetic bridge (7) is arranged at the vertex angle position corresponding to each V-shaped magnetic steel groove (1), and a first air groove (8) is formed between every two adjacent V-shaped magnetic steel grooves (1). According to the invention, the sinusoidal property of the permanent magnet flux density waveform can be effectively improved, and the harmonic content in the flux density is reduced. In addition, the magnetic circuits of the V-shaped magnetic steel grooves can improve the reluctance effect, increases the reluctance torque, enhances the magnetic flux of the rotor, reduces the iron loss of a high-speed region, reduces the torque ripple, improves the efficiency of the permanent magnet synchronous motor to the maximum extent, saves materials and realizes low size and high efficiency.

Description

technical field [0001] The present invention relates to the technical field of motors, in particular to a rotor structure of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used due to their remarkable features such as high efficiency, energy saving and high power density. Although the stator structure and manufacturing process of the permanent magnet synchronous motor are similar to the asynchronous AC motor, the rotor structure of the two is different. The rotor of the permanent magnet synchronous motor has two main structures: embedded type and surface mount type. Cloth way. [0003] The air gap of the existing permanent magnet synchronous motor is similar to that of the asynchronous motor, and the sinusoidal distortion rate of the permanent magnet flux density waveform is as high as more than 20%, and a large number of harmonics that affect the performance of the motor are generated during operati...

AI Technical Summary

Problems solved by technology

[0003]The air gap of the existing permanent magnet synchronous motor is similar to that of the asynchronous motor, and the sinusoidal distortion rate of the permanent magnet flux density waveform is as high as more than 20%. Generate a large number of harmonics that affect the performance of the motor. These harmonics not only increase the power loss of the motor, but also increase the vibration and noise of the motor

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