Controller for a brushless motor
AssigneeDyson Technology Limited
InventorsYongji ZHOU, Libo ZHENG, Hanping DAI
Life of this patent
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Abstract
A controller for a brushless motor that includes a PWM module configured in half-bridge or full-bridge mode. The PWM module outputs control signals for controlling the excitation of a winding of the motor, and one of the duty cycle and the period of the PWM module defines a time at which the winding is commutated.
Claims15
A controller for a brushless motor, the controller comprising a PWM module configured in half-bridge or full-bridge mode, wherein the PWM module outputs control signals for controlling the excitation of a winding of the motor, and one of the duty cycle and the period of the PWM module defines a time at which the winding is commutated.
A controller for a brushless motor, the controller comprising a PWM module configured in half-bridge or full-bridge mode, wherein the controller divides each electrical half-cycle of the motor into a conduction period followed by a freewheel period, the PWM module outputs control signals for exciting a winding of the motor during the conduction period and for freewheeling the winding during the freewheel period, the duty cycle of the PWM module defines one of a time at which the conduction period or the freewheel period starts, and the period of the PWM module defines the other of a time at which the conduction period or the freewheel period starts.
Dependencies are inferred from the claim text.