Most pumps and followers operating in commercial and industrial applications are driven by AC induction motors. “ACIM”, which stands for “alternating permanent magnet synchronous motor electric current induction motor”, is an asynchronous kind of motor that depends on electric current to carefully 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 at all times rotates 
at a lesser speed than the magnetic field. A “PMSM”, which stands for “permanent magnet synchronous engine”, depends on magnets to turn the rotor, which spins at the same acceleration as the PMSM’s internal rotating magnetic field.
There are some key differences among AC induction Motors and Permanent Magnet Synchronous Motors.