Method and device for estimating displacements of the rotor of a motor

摘要

Variations of position of the rotor of a motor having a plurality of uniformly spaced sensors that generate a position pulse at every rotation by a pre-established angle of the rotor, are estimated by carrying out the steps of:
generating a first clock signal at a first frequency;
generating a second clock signal at a second frequency multiple than the first frequency by a first factor;
in each interval between two consecutive position pulses,
- counting the number of pulses of the first clock signal comprised in the interval;
- counting the number of pulses of the second clock signal comprised in the interval;
- each time the number of counted pulses of the second clock reaches the number of pulses of the first clock counted in an interval that precedes the currently considered interval, signaling that the position of the rotor has varied of an angle equal to the ratio between the pre-established angle and the factor. This method is implemented in a respective fully digital device that is particular simple to realize.