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