Patent ID: 6670783
Filing Date: 2003-12-30
Classification: H02P

Abstract:
A method for controlling the power supplied to at least one winding of a stepper motor comprising the steps of:a. determining the reactance of the at least one motor winding; b. determining the amount of voltage available in a drive circuit to the motor; c. selecting a set of speed ranges for the motor; d. establishing a correction factor for each speed range for the motor based on the reactance of the motor winding and the voltage available in the drive circuit; e. establishing a set of factors based on a pseudo-sinusoidal wave; f. multiplying each correction factor by each of the pseudo-sinusoidal wave factors to create a table of application factors; g. selecting a speed of rotation for the motor; and h. supplying current to the motor winding in varying amounts according to the application factors in the table for the selected speed without receiving feedback from said motor.