Abstract
A permanent magnet DC brushless motor for electric power steering can be driven up to high revolution speeds by using field weakening control that reduces the magnetic flux. However, a motor vibration is caused by this field weakening control. Therefore, we need to develop a low vibration motor at the field weakening control. The authors focused on this issue, and clarified a mechanism of vibration caused by a magnetostriction of stator core at the field weakening control. In addition, this mechanism was verified by using an actual motor. It was shown that the authors obtained a new finding by the process of this research.
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