A. Two ways; overdrive the motor (for example, drive a 1760 rpm motor over 1800 and then either…
1. Connect it to an AC sine signal (usually connect to the Grid at 50 or 60 Hz) or…
2. Give the motor a jolt of DC current to ‘excite’ the motor’s magnetic fields and then have capacitors to ‘catch’ and recycle the signal. (This allows off-grid power production)
The RYEM book gives full details on how to do both of these techniques.