Invention Grant
US07834565B2 Method of controlling a brushless DC motor 有权
控制无刷直流电机的方法

Method of controlling a brushless DC motor
Abstract:
A method of controlling a brushless DC motor of the type having a stator, comprising a stator winding excitable to generate a stator magnetic field, and a rotor, arranged to rotate with respect to the stator and comprising permanently magnetized material arranged to generate a rotor magnetic field to interact with the stator magnetic field to produce rotation of the rotor. The method comprises the steps of driving current through the stator winding to generate a stator magnetic field to interact with the rotor magnetic field, detecting rotor position with respect to the stator, and cyclically commutating the stator winding current according to rotor position as the rotor rotates. Each commutation cycle includes a drive portion during which current is driven through the stator winding in one sense and at the end of which the driving of current in said sense is ceased. The method further comprises the steps of during an initial portion of each drive portion, driving current through the winding such that the magnitude of the winding current increases and during an end portion of each drive portion, actively reducing the magnitude of the winding current.
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