Patent ID: 7026785
Filing Date: 2006-04-11
Classification: H02P,Y02P

Abstract:
1. A controller for an electric motor with a rotational speed and using electrical current, comprising: a voltage controller for generating a voltage control signal in response to the speed and the current usage of the motor wherein the voltage control signal represents an efficient operating mode of the motor, wherein the voltage control signal is based on a physical relationship between maximum efficiency and the speed and current usage of the electric motor; and a frequency controller for generating a frequency control signal in response to the speed and current usage of the motor wherein the frequency control signal represents an efficient operating mode of the motor, wherein the frequency control signal is based on the physical relationship between maximum efficiency and the speed and current usage of the electric motor, a multiplier for combining the frequency control signal and the voltage control signal such that the combined signal is applied to the voltage operating the motor.