Patent ID: 11876478
Assignee: GLOBAL MIXED-MODE TECHNOLOGY INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. 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.