Patent ID: 6288516
Filing Date: 2001-09-11
Classification: H02P

Abstract:
A food processor having an induction motor coupled to an impeller, the induction motor having a main winding and a starter winding, a motor controller connected with the starter winding and the main winding, said motor controller comprising;a motor speed detector coupled to the motor to produce a speed signal proportional to the speed of the motor; anda signal processing circuit responsive to the speed signal to perform the steps of (a) connecting the starter and main windings in circuit with a source of electrical power if the motor speed is less than a set speed and (b) disconnecting the starter winding from the source of electrical power if the motor speed is equal to or greater than the set speed, wherein the motor is energized by the starter and main windings during motor start operations and during high torque conditions in which the motor speed declines below the set speed and is energized by the main winding when the motor speed is equal to or greater than the set speed.