Synchronous motor vs.
synchronous generator
Let us suppose that a phasor
diagram of synchronous
generator is shown. BR produces
EA, Bnet produces Vφ, and BS
produces Estat = -jXSIA. The
rotation on both diagrams is
counterclockwise and the
induced torque is
clockwise, opposing the direction of rotation. In other words, the induced torque in
generators is a counter-torque that opposes the rotation caused by external torque.
If the prime mover loses power, the rotor will slow down and the rotor field BR will
fall behind the magnetic field in the machine Bnet. Therefore, the operation of the
machine changes…