Patent ID: 8008882
Filing Date: 2011-08-30
Classification: H02P

Abstract:
1. A rotation speed controlling system for a shredder motor comprising: a bridge rectifier circuit which delivers DC current; a forward/reverse controlling switch for reversing a direction of DC current flow in the stator coils; a motor rotation speed switch; and an electric motor comprising: a rotor coil energized by DC current from the bridge rectifier; a first stator coil; and a second auxiliary low-speed stator coil, wherein the torque and speed of the shredder motor is maintained at a higher torque and slower speed when DC current from the bridge rectifier is directed by the motor rotation speed switch through both the first stator coil and the second auxiliary low-speed stator coil and the shredder motor is maintained a lower torque and faster speed when DC current from the bridge rectifier is directed by the motor rotation speed switch through only the first stator coil.