Analysis of control technology on electromagnetic noise of permanent magnet synchronous motor

The sound field distribution is different for disc type permanent magnet motor with different structures and parameters. The effect of structures and parameters on the electromagnetic noise had been discussed in this paper, such as ratio of axial length to diameter, effective pole arc coefficient, length of magnetization direction, width of stator slot, and length of air-gap. In this paper, how to choose noise measuring point and determine the noise distribution characteristic for disc type motor with different shapes are also discussed.