Method for weakening cogging torque of permanent magnet synchronous generator

Abstract

The invention belongs to the permanent magnet synchronous generator technology field, and particularly relates to a method for weakening cogging torque of a permanent magnet synchronous generator. The method for weakening the cogging torque of the permanent magnet synchronous generator includes: firstly, optimizing the shape of a permanent magnet motor tooth so as to reduce the cogging torque; then, optimizing a pole arc coefficient; next, using a magnet pole shifting method to reduce a harmonic component of the cogging torque so as to achieve the purpose of reducing the cogging torque; finally, combining the above three steps so as to minimize the cogging torque, building a finite element model of the permanent magnet synchronous generator, and performing analysis and finite element verification on a provided cogging torque suppression method. The method for weakening the cogging torque of the permanent magnet synchronous generator has the advantages of reducing the cogging torque of the permanent magnet synchronous generator on the premise of slightly influencing other properties of the permanent magnet synchronous generator by changing the shape of the tooth and using an optimal pole arc coefficient method and a magnetic pole shifting method in combination, and then reducing starting resistance torque of a direct drive permanent magnet synchronous wind generator, and improves usage rate of wind energy.

Description

Technical field [0001] The invention belongs to the technical field of permanent magnet synchronous generators, and in particular relates to a method for weakening the cogging torque of a permanent magnet synchronous generator. Background technique [0002] With the development of permanent magnet motors, permanent magnet wind generators account for an increasing proportion of small and medium-sized wind turbines. Cogging torque directly affects the starting and low-speed running performance of the generator. In the operation of a permanent magnet motor, the cogging torque will cause pulsation and noise of the output torque, especially the low-speed operation of the motor, and it is also an important factor affecting the control accuracy of the system. Cogging torque is a unique problem of permanent magnet motors, and it is also one of the hotspots of permanent magnet motor research. [0003] Methods to reduce the cogging torque of permanent magnet wind turbines include: slot-pol...

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Problems solved by technology

[0004] Although there are various methods to weaken the cogging torque, some of them have obvious disadvantages and are difficult to be widely used in practice, for example, the method of stator skew or rotor skew, both of which weaken the cogging torque The principle is similar, it is difficult to achieve large-scale production and processing, and the use of these two methods will increase the magnetic flux leakage of the motor and reduce the torque

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