Virtual slot rotor of embedded permanent magnet motor

Abstract

Provided is a virtual slot rotor of an embedded permanent magnet motor. An even number of magnetic steel slots are distributed on a rotor punching sheet of the virtual slot rotor uniformly. A magnetic steel is embedded in each magnetic steel slot. The magnetic steels are arranged at intervals according to the N pole and the S pole, and each rotor pole is equipped with at least two recessed grooves at the cylindrical part of the punching sheet. Through design of the recessed groove, the cogging torque and the torque ripple can be lowered effectively. When the mode is compared with other cogging torque and torque ripple weakening modes, weakening of the magnetic flux and the counterelectromotive force can be neglected, and the motor power density is kept effectively.

Description

Technical field [0001] The invention relates to a motor, in particular to a virtual slot rotor of an embedded permanent magnet motor. Background technique [0002] Permanent magnet motors have been widely used in many fields due to their high efficiency and high power density, such as industrial servo fields and automotive drive motors. However, because the permanent magnet motor has a fixed magnetic field, the cogging torque will be formed due to the influence of slotting under no-load conditions, and the torque pulsation will be larger if the design is unreasonable. In the field of vehicle drive motors, the existence of severe cogging torque and torque pulsation will not only cause problems in the vehicle mechanism, but also cause vehicle jitter, noise problems, and seriously affect the comfort of the vehicle. Sex. [0003] In terms of technology to solve cogging torque and torque pulsation, the traditional common technologies often include the following: [0004] 1) Rotor sinus...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to solve the problem of not affecting the torque density and power density as much as possible on the basis of reducing cogging torque and torque ripple.

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