| 摘要 |
In a fan with a DC motor drive without a commutator, recesses are formed on the inner surface of a stator core in order to provide a permeance gradient in such a manner that the north pole of the permanent magnet rotor is able to stop at a predetermined point which is separated by a predetermined rotation angle from a position sensor, and the motor can rotate in a predetermined direction after the current has been switched on.
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