Motor controller
AssigneeGlobal Mixed-mode Technology Inc.
InventorChi-Hong Su
Life of this patent
Estimating the term…
Abstract
A motor controller comprises a switch circuit and a control unit. The switch circuit is coupled to a motor for driving the motor. The control unit is configured to generate a control signal to control the switch circuit. The motor controller is configured to generate a current signal and a voltage signal. When a current phase of the current signal is at a predetermined crossing phase, the motor controller calculates a difference value between the current phase of the current signal and a voltage phase of the voltage signal, where the motor controller is configured to control the difference value. The motor controller may stabilize the motor and avoid noise by modulating the difference value. The motor controller may modulate the difference value, such that the difference value is equal to a predetermined phase difference.
Claims22
A motor controller comprising:
- a switch circuit, coupled to a motor for driving the motor;
- and
- a control unit, configured to generate a control signal to control the switch circuit,
- wherein the motor controller is configured to generate a current signal and a voltage signal, when a current phase of the current signal is at a predetermined crossing phase, the motor controller calculates a difference value between the current phase of the current signal and a voltage phase of the voltage signal, the motor controller is configured to control the difference value for switching phases, such that the motor controller achieves a phase switching function detecting a back electromotive force of a floating phase, and the motor controller drives the motor without utilizing a Hall sensor in all modes of operation,
- wherein the motor controller modulates the difference value, such that the difference value is equal to a predetermined phase difference,
- wherein the predetermined phase difference is related to a speed of the motor, and
- wherein when the speed of the motor increases, the predetermined phase difference decreases.
Dependencies are inferred from the claim text.