Computerized evaluation of resolver sensor signals to determine rotor position in an electrical machine for a vehicle

A circuit for evaluating resolver sensor signals in a vehicle, the circuit comprising:

• a resolver sensor configured to sense a rotary movement of a rotor of an electrical machine and to output at least one sinusoidal or cosinusoidal amplitude-modulated analog signal indicative of the rotary movement of the rotor;
• and
• an electronic processor including a data processing unit, a resolver sensor actuation unit and a resolver sensor evaluation unit,
• wherein the at least one sinusoidal or cosinusoidal amplitude-modulated analog signal of the resolver sensor is received by the resolver sensor evaluation unit,
• wherein the resolver sensor actuation unit supplies an excitation signal for actuating the resolver sensor, and also a synchronization signal to the resolver sensor evaluation unit,
• wherein the synchronization signal provides demodulation of the at least one sinusoidal or cosinusoidal amplitude-modulated analog signal of the resolver sensor by the resolver sensor evaluation unit, and
• wherein the synchronization signal in synchronism with the excitation signal triggers a sample of the at least one sinusoidal or cosinusoidal amplitude-modulated analog signal at the resolver sensor evaluation unit such that the at least one sinusoidal or cosinusoidal amplitude-modulated analog signal is sampled by an analog-to-digital converter when the excitation signal reaches a maximum whereby the demodulation of the at least one sinusoidal or cosinusoidal amplitude-modulated analog signal occurs, and whereby a position and a speed of the rotor is ascertained.