Patent ID: 6054825
Filing Date: 2000-04-25
Classification: G11B,H02P

Abstract:
In an electromechanical system including a motor having a plurality of windings and a driver circuit for driving a voltage alternately on sets of the plurality of windings to ensure a rotation of the motor, a method for generating a voltage comprising the steps of:(a) driving a first set of the plurality of windings during a first interval using a first voltage derived from a first power supply voltage;(b) sensing a first back electromotive force (EMF) voltage on a second set of the plurality of windings during said first interval;(c) driving a third set of the plurality of windings during a second interval using said first voltage;(d) sensing a second back EMF voltage on a fourth set of the plurality of windings during said second interval;(e) generating a second voltage different from said first power supply voltage using said first back EMF voltage and said second back EMF voltage; and(f) generating a third voltage having an opposite polarity from said second voltage using said first back EMF voltage and said second back EMF voltage.