Patent ID: 7714571

Claim:
A method of estimating variation of position of a rotor of a motor having a plurality of spaced sensors that generate a position pulse at every rotation by a pre-established angle of the rotor, the method comprising: generating a first clock signal at a first frequency; and generating a second clock signal at a second frequency, the second frequency equal to the first frequency multiplied by a first factor; estimating variation of position of the rotor, in each interval between two consecutive position pulses, by performing at least the following counting a number of pulses of the first clock signal, and counting a number of pulses of the second clock signal, wherein each time the number of counted pulses of the second clock signal reaches the number of pulses of the first clock signal counted in an interval that precedes a current interval, signaling that the position of the rotor has rotated by an angle equal to a ratio between the pre-established angle and the first factor.