Iomega Corporation

Kirk D Hanson

Mark W Perona

Steve Rabin

A motor control system employing a single Hall sensor 2 providing a position feedback signal to a control circuit 10 is disclosed. The control circuit includes a tach counter circuit 12, a ramp mode circuit 14, an interpolation circuit 16, and a commutation logic circuit 18. Drive signals are output to the motor windings by the commutation logic circuit 18. The control state defining the drive signals is advanced on the basis of the estimated rotor position. The estimate of the rotor position is determined by linearly interpolating between Hall signal transitions.

Servo motor controller using position interpolation

A method for controlling the speed of a motor driven by an unregulated voltage supply is disclosed. The disclosed method comprises obtaining a ripple signal (V.sub.R) representative of the ripple component of the supply voltage, and modulating the motor current (I.sub.M) in response to at least the ripple signal to maintain the speed of the motor at a prescribed target speed.

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San Diego, CA, United States of America

Kirk D Hanson