Analysis of starting resistance moment of direct drive wind turbine

Bin He,Quan Liu,W.-P Sung,J.C.M Kao

doi:10.1051/matecconf/20164402031

Abstract

Permanent magnet motor in the process of running, the permanent magnets provided the magnetic field , the core will have a strong attraction, produce the cogging torque and torque ripple, vibration and noise and other disharmony factors, seriously affect the control precision of the motor system.Therefore, in the design of permanent magnet wind turbine generator, weaken the cogging torque is very important.

Highlights

Permanent magnet motor in the process of running, the permanent magnets provided the magnetic field, the core will have a strong attraction, produce the cogging torque and torque ripple, vibration and noise and other disharmony factors, seriously affect the control precision of the motor system.in the design of permanent magnet wind turbine generator, weaken the cogging torque is very important
MATEC Web of Conferences characteristics of permanent magnet motor, especially for low speed wind power generator, the cogging torque is too large, will cause strong vibration and noise.The permanent magnet is relative to the armature winding, both the outer and the inner rotor
Finite element analysis method Finite element method in electromagnetic calculation, have used the very mature, the development of commercial software such as Ansys, Ansoft has high accuracy.With finite element method can get the magnetic field distribution, the torque by the node to take.It is concluded that magnetic volume and surface force as: IL: wN7LN

Summary

The reason of cogging torque The cogging torque is the inherent

MATEC Web of Conferences characteristics of permanent magnet motor, especially for low speed wind power generator, the cogging torque is too large, will cause strong vibration and noise.The permanent magnet is relative to the armature winding, both the outer and the inner rotor. Finite element analysis method Finite element method in electromagnetic calculation, have used the very mature, the development of commercial software such as Ansys, Ansoft has high accuracy.With finite element method can get the magnetic field distribution, the torque by the node to take.It is concluded that magnetic volume and surface force as: IL: wN7LN (1.1). The effect of each node and, get the whole volume on the torque:

The effective methods to reduce the cogging torque

Findings

Brief summary