Motor rotor and method of manufacturing same

Abstract

The invention relates to a motor rotor and a method of manufacturing the same. The motor rotor (2000) includes a rotor yoke (250) and a plurality of magnetic pole modules (200) disposed on the rotor yoke (250); each magnetic pole module (200) includes a substrate (210), a case (240) and a pair of magnetic pole units (220, 230) with opposite polarities accommodated in an accommodation space formedby the substrate (210) and the case (240); the magnetic pole units (220, 230) in each magnetic pole module (200) are spaced apart from each other by a first distance along the circumferential direction of the rotor yoke (250); and the plurality of magnetic pole modules (200) are mechanically fixed to the rotor yoke (250) through pressing bars (280) and fasteners ( 270). With the motor rotor of themotor rotor of the invention, generator performance (cogging torque and torque ripple), the protection of the magnetic poles, and the mechanical fixation of the magnetic poles can be shared.

Description

technical field [0001] The present invention relates to the field of electrical machines, and more specifically, to a magnetic pole module, a motor rotor including the magnetic pole module, and a method for manufacturing the motor rotor. Background technique [0002] For permanent magnet direct drive generators of large wind turbines, two important design indicators are to reduce the cogging torque and torque ripple of the generator. The smaller the cogging torque of the generator, the lower the cut-in wind speed of the wind turbine unit, which expands the operating range of the unit's speed and improves the utilization rate of wind energy and the power generation of the unit. The smaller the torque ripple of the generator, the higher the operation stability of the wind turbine and the longer the service life of the rotating parts such as bearings. [0003] In order to reduce the cogging torque and torque ripple of the generator, the usual solution in motor design is that t...

AI Technical Summary

Problems solved by technology

Although the plug-in magnetic pole fixing process realizes the reliable fixing of the magnetic pole through the slot fixed structure, there is still a hidden danger of insufficient sealing of the magnetic pole. Under the long-term high temperature and high humidity operating conditions of the wind turbine, the magnetic pole is extremely prone to corrosion. Powdering, thereby weakening the excitation flux of the rotor pole and the air gap magnetic induction of the generator, thereby reducing the power generation of the wind turbine

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