Patent ID: 7233125

Claim:
A system for controlling an induction motor comprising: a power inverter circuit adapted to be connected to a power supply and an induction motor; an operational amplifier circuit operatively connected to said power inverter circuit and operative therewith for sensing DC current and controlling acceleration and deceleration of the induction motor, and including a first operational amplifier operative in a motoring mode to have a positive polarity output and remain substantially at zero during a regeneration mode, and a second operational amplifier operative in a regeneration mode to have a negative polarity output and remain substantially at zero in a motoring mode; a current sensing resistor operatively connected to said power inverter circuit and operational amplifier circuit and having a value wherein the voltage across the current sensing resistor will not exceed a clamping limit voltage level of an operational amplifier input, wherein said power inverter circuit is operative for increasing a voltage/frequency ratio during deceleration to provide greater back electromotive force (EMF) to be generated, leading to higher regeneration and faster deceleration.