Patent ID: 6987368
Filing Date: 2006-01-17
Classification: H02P

Abstract:
1. A motor controller including a position sensing device having a position sensor for sensing a magnetic pole of a motor, a driver for driving the motor, and a wiring section for feeding a power supply voltage from the driver into the position sensing device, wherein the position sensing device comprises: a superposed wave transmitter coupled to a first end of the wiring section; a serial converter for converting a signal of the position sensor into a serial signal; and a sensing-device interface disposed between the serial converter and the superposed wave transmitter, the driver comprises: a dc power supply; a superposed wave receiver coupled between the dc power supply and a second end of the wiring section; a parallel converter for converting the serial signal into a parallel signal; a driver interface disposed between the superposed wave receiver and the parallel converter; and a power switching circuit to be driven by the parallel signal, wherein the serial signal is superposed to the wiring section and transmitted, and the power switching circuit switches a phase excitation for driving the motor, and wherein the superposed wave transmitter includes a sensing-device transformer, which has a power supply wire-wound section coupled to the first end of the wiring section and a signal wire-wound section coupled to the sensing-device interface; and the superposed wave receiver includes a driver transformer, which has a power supply wire-wound section coupled to the second end of the wiring section and a signal wire-wound section coupled to the driver interface.