Rotor assembly and consequent pole motor

Abstract

The invention provides a rotor assembly and a consequent pole motor. The rotor assembly comprises a rotor core (1), the rotor core (1) comprises permanent magnet poles and consequent poles, the permanent magnet poles and the consequent poles are alternately arranged along the circumferential direction, the permanent magnet poles comprise mounting grooves (2), permanent magnets (3) are mounted in the mounting grooves (2), first air grooves (4) extending along the direction far away from the center lines of the permanent magnet poles are formed in two circumferential ends of the mounting grooves(2), and air grooves are not formed in the radial peripheral sides of the mounting grooves (2). According to the rotor assembly, the torque ripple of the motor in the operation process can be reduced, and the reliability of the motor is improved.

Description

technical field [0001] The present application relates to the technical field of motors, in particular to a rotor assembly and an alternating pole motor. Background technique [0002] The number of permanent magnets used by the alternating pole permanent magnet synchronous motor is only half of that of the traditional permanent magnet synchronous motor. Therefore, it can fully utilize the permanent magnets, which can significantly reduce the amount of permanent magnets used, thereby reducing the cost of the motor. [0003] However, its special magnetic circuit structure also brings many problems, including the decrease of output torque caused by the reduction in the use of permanent magnets, and the problem of increased torque fluctuation caused by the asymmetry of adjacent magnetic pole structures, which limits the further promotion of alternating pole motors. application. [0004] A method for suppressing torque ripple is proposed in the prior art. Air grooves are arrange...

AI Technical Summary

Problems solved by technology

However, it cannot adjust the magnetic force lines on the alternating poles. Due to the lack of magnetomotive force source, that is, the constraint of permanent magnets, the distribution of the magnetic force lines on the alternating poles is more disordered than that of the permanent magnetic poles, and the magnetic density on the permanent magnetic poles is already seriously saturated. After the air slot is installed, some narrow areas will be easily saturated, resulting in large torque fluctuations of the motor and reduced operational reliability

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