Method for estimating the position of a rotor of a synchronous electrical machine

A method for estimating the position of a rotor of a synchronous electrical machine without the injection of signals, comprising a rotor and a stator coupled to an inverted synchronous electrical machine, acting as exciter, via a rectifier, the rectifier being connected to the rotor excitation of the main machine, the estimation method comprising the following steps:

• a. measurement of a current iabc circulating in the stator of the synchronous electrical machine;
• b. determination of two signals in quadrature iα;
• iβ according to a stationary reference frame from the current iabc and isolation of two filtered signals iαh;
• iβh from the two signals in quadrature iα;
• iβ;
• c. demodulation of the two filtered signals iαh;
• iβh in order to obtain two demodulated signals iαobs, iβobs, the step of demodulation of the two filtered signals iαh;
• iβh using a measurement of a current iex of the stator of the inverted synchronous electrical machine;
• d. obtaining of an estimated position {circumflex over (θ)} of the rotor from the two demodulated signals iαobs, iβobs.