Hybrid rotor continuous pole permanent magnet synchronous motor and method for reducing torque ripple thereof

Abstract

The invention discloses a hybrid rotor continuous pole permanent magnet synchronous motor and a method for reducing torque ripple thereof. The hybrid rotor continuous pole permanent magnet synchronousmotor comprises an outer stator and an inner rotor. The outer stator is provided with five phases of distributed armature windings; and the inner rotor is provided with surface-embedded permanent magnets and spoke type permanent magnets. The method for reducing torque ripple of the hybrid rotor continuous pole permanent magnet synchronous motor comprises the following specific steps: to begin with, increasing phase number of the permanent magnet motors to reduce the torque ripples; then, optimizing pole arc coefficient and thickness of the surface-embedded permanent magnets and the length andwidth of the spoke type permanent magnets to reduce the torque ripples again; and carrying out angular deflection on the spoke type permanent magnets to further reduce the torque ripples. The motor overcomes the disadvantages of large torque ripple, large eddy-current loss of the permanent magnets and easy demagnetization of the permanent magnets when overloaded of a conventional continuous polepermanent magnet synchronous motor, and meanwhile, maintains the characteristics of high torque density and high utilization rate of the permanent magnets of an original motor.

Description

technical field [0001] The invention relates to the design of a hybrid rotor continuous pole permanent magnet synchronous motor, in particular to a method for reducing torque ripple of a hybrid rotor continuous pole permanent magnet synchronous motor, belonging to the technical field of motor manufacturing. Background technique [0002] Nowadays, permanent magnet synchronous motors have been widely used, and they play a very important role in many fields from automobiles to aerospace. This is mainly due to several salient features of permanent magnet synchronous motors, including high torque density, high efficiency, and small weight and volume. The permanent magnet synchronous motor uses a magnetic material with a high magnetic energy product to replace the traditional excitation winding, which not only eliminates the negative impact of the excitation winding, but also simplifies the mechanical structure of the motor, which improves the reliability of the motor and reduces ...

AI Technical Summary

Problems solved by technology

The eddy current loss of the permanent magnet of the traditional continuous pole permanent magnet synchronous motor is large, and the permanent magnet is prone to demagnetization when overloaded. Therefore, it is very meaningful and necessary to reduce the eddy current loss of the permanent magnet and enhance the anti-demagnetization ability of the permanent magnet to improve the efficiency and reliability of the motor.

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