CONTACTLESS POWER SUPPLY AND MOTOR CONTROL SYSTEM

A contactless power supply (100) and motor control system (110) includes a pulse width modulator (102), a rotary transformer(104), a demodulator circuit (106), a motor driver (108) and a motor (110). The pulse width modulator (102) supplies a first pulse width modulated (PWM) signal that has a duty cycle and a first amplitude. The rotary transformer (104) receives the PWM signal. The secondary winding (122) is rotatable relative to the primary winding (118) and supplies a second PWM signal having the duty cycle and a second amplitude. The demodulator circuit (108) is rotatable with the secondary winding (122) and supplies a demodulated direct current (DC) voltage having a DC voltage amplitude. The motor driver is rotatable with the secondary winding (122) and the demodulator circuit (106) and controllably supplies motor current. The motor receives the motor current and rotates at a rotational speed.