MOTORIZED SURGICAL HANDPIECE AND CONTROLLER FOR REGULATING THE HANDPIECE MOTOR BASED ON THE INDUCTIVELY SENSED DETERMINATION OF MOTOR ROTOR POSITION

摘要

A surgical tool system including a handpiece with a motor for driving a cutting accessory. The system includes a control unit for applying energization signals to the windings internal to the handpiece motor. At start-up and low speeds, the rotational position of the rotor relative to the static windings is determined based on inductances of the windings. At high speeds, the rotational position of the winding is determined based on the back electromotive forces developed across the windings.