High Efficient PMSM Motor

The Permanent Magnet Synchronous Motor (PMSM) is also called AC synchronous motor and IE4 or Super High Efficient Motor where the field is excited by permanent magnets that generate sinusoidal back EMF. This unique magnetic motor harnesses magnetism to create continual motion. So what this suggests is that after the motor starts it'll pass by itself and while the magnets maintain their polarity, the motor will never stop running.