1. Control strategy

• The asynchronous machine is often powered by a voltage inverter with forced-switching semiconductor components controlled by pulse-width modulation (PWM), a DC voltage slicing technique that supplies the machine with waveforms whose mean value evolves sinusoidally.

The control diagrams in figures 1 and 2 show that there are two control chains.

Each chain comprises a control variable (voltage $V_{\text{sd}}$ or $V_{\text{sq}}$...