Patent ID: 6194863
Filing Date: 2001-02-27
Classification: H02P

Abstract:
A method for controlling a stepper motor in which digital set current values are stored in the form of a sine table with a number t of table places and are read out of this sine table, and in which a motor current is derived from the read-out digital set current values for the excitation of a phase of the stepper motor, the method comprising:selecting at a constant scanning frequency f.sub.A digital set current values out of said table places of said sine table, wherein the intervals between the read-out table places can be varied to be any interval from every table place up to every (t/2-1)-th table place;converting every read-out digital set current value to a discrete analog signal;suppressing, by means of a low-pass filter with a frequency limit flimit<1/2f.sub.A, all frequencies outside of the spectrum of all reconstructable sine frequencies; andreconstructing a sine signal from which the motor current for the excitation of a phase of the stepper motor is derived.