| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of controlling a brushless permanent-magnet motor which improves the efficiency of the brushless permanent-magnet motor.SOLUTION: The method of controlling a brushless permanent-magnet motor includes dividing each half of an electrical cycle of the motor into a conduction period and a following primary freewheel period. The conduction period is then divided into a first excitation period, a secondary freewheel period, and a second excitation period. The method then involves exciting a winding of the motor during each excitation period and freewheeling the winding during each freewheel period. The secondary freewheel period has a position and length within the conduction period that acts to reduce the harmonic content of current in the winding relative to back EMF in the winding. As a result, the efficiency of the motor is improved. |
