Most pumps and fans operating in commercial and commercial applications are currently driven by AC induction motors. “ACIM”, which stands for “alternating current induction motor”, is an asynchronous type of motor that depends on electric current to turn the rotor. Torque is certainly produced by electric current in the rotor. The electric energy is generated through electromagnetic induction from the magnetic field 
of the stator windings. Within an ACIM, the rotor at all times rotates at a lesser speed than the magnetic field. A “PMSM”, which means “permanent magnet synchronous motor”, relies on magnets to turn the rotor, which spins at the same velocity as the PMSM’s permanent magnet synchronous motor internal rotating magnetic field.
There are a few key differences among AC induction Motors and Permanent Magnet Synchronous Motors.