Patent ID: 7477174

Claim:
A method for measuring at least two analog signals, corresponding respectively to a first and a second phase of a three-phase motor, comprising: creating, at successive sampling instants and at least by means of a first analog/digital converter, digital samples representing a value taken respectively by these two analog signals at these sampling instants, selectively supplying, at each sampling instant, either of the two analog signals to the first analog/digital converter to generate a corresponding original digital sample, combining at least two original digital samples, created for a first at least of the two analog signals at respective sampling instants, in order to form, by interpolation, a derived digital sample representing the value taken by this first analog signal at a reference instant that is offset in time in relation to each of the sampling instants of this first analog signal, and deducing from the derived digital sample value a value of a third phase of the three-phase motor, considering the motor as stable, at the reference instant.