Patent ID: 7282878
Filing Date: 2007-10-16
Classification: H02P

Abstract:
1. A controller for a brushless DC motor to control rotor position of said motor comprising: first logic configured to receive information indicative of a target angular position of said rotor; a sensor operative with said motor to produce a current-position signal representative of a current angular position of said rotor; motor drive circuitry operative with said motor to provide a motor drive signal to said motor to operate said motor; and control logic configured to produce a motor control signal as an input signal to said motor drive circuitry, said motor control signal being dependent on a phase difference between a target position signal representative of said target angular position and said current-position signal, said motor drive signal being generated in response to said motor control signal to energize of group of phase windings comprising said motor, wherein one of said phase windings from among said group of said phase windings is energized to exert a first torque and another phase winding from among said group of phase windings is energized to exert a second torque opposite to said first torque.