Patent ID: 6060849
Filing Date: 2000-05-09
Classification: H02P

Abstract:
A current control system for adjusting consumed current of an electric motor, said system comprising:a plurality of resistors connected in parallel to each other, wherein said resistors are in series coupled to said electric motor, and a resistance value of each combination of said resistors corresponds to a specified working condition of said electric motor, wherein each said combination comprises selected ones of said resistors and the resistance value of each said resistor is predetermined;switching means for adjusting a current path through said electric motor and said plurality of resistors while maintaining a speed of said electric motor, wherein said switching means is connected to said plurality of resistors and is used to decide which of said resistors are selected into said current path, wherein said selection is made so that a predetermined optimized torgue is achieved corresponding to a specified frequency of said electric motor; anda controller for controlling said switching means, wherein on and off states of said switching means are controlled by said controller, and the operation of said controller is according to a plurality of signals it receives.