Patent ID: 6882125

Claim:
A motor controller comprising: a motor-position detector; and a motor driver, coupled to said motor-position detector by a power cable having a pair of electric lines, for supplying control-power to said detector via the power cable, wherein said controller transmits information about driving a motor between said detector and said driver via the power cable, wherein said motor-position detector includes: a power-receiving section; a power-receiving path for coupling the power cable to the power-receiving section; a signal-coupling circuit, disposed on said detector side, for AC coupling with the power-receiving path; a motor-position-detecting circuit for outputting parallel information about motor-position; an encoding circuit for converting the parallel information about the motor-position into serial information; and a motor-position-transmitting circuit for outputting the serial information about the motor-position to the signal-coupling circuit, wherein said motor driver includes: a power-supplying section; a power-supplying path for coupling the power-supplying section to the power cable; a signal-coupling circuit, disposed on said driver side, for AC coupling with the power-supplying path; a motor-position-receiving circuit for receiving serial information about the motor-position from the signal-coupling circuit on said driver side; a decoding circuit for converting the serial information about the motor-position into parallel information; and a motor-driving circuit for driving the motor according to the parallel information thus obtained.