Patent ID: 6489742
Filing Date: 2002-12-03
Classification: H02P

Abstract:
An efficiency-maximizing motor controller comprising:an induction-motor power conveyance with which mains voltage from a power supply is in electrical communication for power to be applied to the induction motor through a shunt resistor in a mains neutral line and a predetermined control element in a mains line in electrical communication with the power supply; a voltage analog-to-digital (A/D) converter in electrical communication intermediate the power supply and a digital signal processor (DSP); mains voltage being in electrical communication to be applied to the voltage A/D converter; output of the voltage A/D converter being in electrical communication to be applied to the DSP for voltage measurement; a volts zero-crossing detector in electrical communication intermediate the power supply and the DSP; mains voltage being in electrical communication to be applied to the volts zero-crossing detector; output of the volts zero-crossing detector being in electrical communication to be applied to the DSP for time and phase-angle measurements of volts; a current A/D converter in electrical communication intermediate the power supply and the DSP; current to drive the induction motor being in electrical communication to be monitored by the shunt resistor; the current being in electrical communication to be applied to the current A/D converter through the shunt resistor; output of the current A/D converter being in electrical communication to be applied to the DSP for current measurement; a current zero-crossing detector in electrical communication intermediate the power supply and the DSP; mains current being in electrical communication to be applied to the current zero-crossing detector through the shunt resistor; output of the current zero-crossing detector being in electrical communication to be applied to the DSP for time and phase-angle measurements of current; the DSP having computer architecture to compute predetermined parameters of the induction motor selectively; the DSP being a micro-controller for controlling current for the induction motor in predetermined response to the predetermined parameters of the induction motor; an optoelectronically (opto) isolated driver in electrical communication intermediate the DSP and the control element; and a switching controller in electrical communication intermediate the opto isolated driver and the control element.