Patent ID: 7999497

Claim:
A control device ( 30 ) for controlling a polyphase rotary electrical machine, said machine comprising a stator, a rotor and sensors, said control device provided to receive: at least a first sensor signal (V, W, U) representing a position of said rotor with respect to said stator and delivered by a first sensor ( 16 ; 18 ; 14 ), and a second sensor signal representing said position and shifted in phase with respect to said first signal (V; W; U), said second sensor signal being delivered by a second sensor ( 14 ; 16 ; 18 ); said control device comprising: combining means (K, R) for combining said first and second sensor signals (U, V, W) in a combined signal (K u ; K v ; K w ), said combining means comprising at least one switching element (K 0 , K 1 , K 2 , K 3 ) controlled with a variable duty cycle ratio, said at least one switching element receiving at least one of said first and second sensor signals for passing therethrough; said combined signal (K u ; K v ; K w ) being a function of said duty cycle ratio and provided to control said machine.