Permanent magnetism material's stability and its application in motor

The choice of permanent magnetism material and magnetic pole's structure has direct relations with the design of permanent magnetism motor, and it is the initial problem which needed to resole when we design permanent magnetism motor. In this paper, we have mainly studied the processing methods about permanent magnetism material magnetic field's stability, especially the procession about artificial aging, AC demagnetization, magnetic touching stability and temperature cycling stability. And we also have compared these data. What we have studied must be helpful to process and apply permanent magnetism material.