Patent ID: 11962219
Assignee: TIANGONG UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. The control method of a flexible permanent magnet brushless DC motor according to claim 10, wherein in a constant-power operation state, a given reference rotating speed range is divided into a plurality of reference rotating speed intervals; a comparison table for the reference rotating speed intervals, the phase number of the armature windings conducted at the same time and a hysteresis comparator are provided; the phase number of the armature windings conducted at the same time in the comparison table is sequentially decreased by one with the decrease of the reference rotating speed; a threshold of the hysteresis comparator is set, for each given reference rotating speed, the phase number of the armature windings initially conducted at the same time is determined by the comparison table; when a difference between the reference rotating speed and the maximum speed in a current rotating speed interval is greater than the threshold, the phase number of the armature windings connected at the same time is increased by one; and when the difference between the reference rotating speed and the minimum rotating speed of the current rotating speed interval in the table is smaller than the negative threshold, the phase number of the armature windings conducted at the same time is decreased by one.