Patent ID: 6831431
Filing Date: 2004-12-14
Classification: G01D,G01P,H02P

Abstract:
A method of controlling the actual value of the rotation frequency of a motor having a digital rotation frequency controller associated therewith, so that said motor will run at a target rotation frequency having a predetermined mathematical relationship to a target frequency supplied to said controller,comprising executing repeatedly, in an arbitrary sequence, the two steps of: in a first time segment, having a length determined by events of the rotation frequency, obtaining, from the actual value of the rotation frequency signal, a first numerical frequency value characterizing the rotation frequency of the motor; in a second time segment, having a length determined by events of the target frequency and overlapping the first time segment, obtaining, from said target frequency, a second numerical frequency value characterizing the frequency thereof; followed by the step of, by means of the first and second numerical frequency values, controlling, using the digital speed controller, the rotation frequency of the motor toward a said target rotation frequency having a predetermined mathematical relationship to the target frequency.