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Most pumps and followers operating in commercial and industrial applications are currently driven by AC induction motors. “ACIM”, which stands for “alternating electric current induction motor”, is an asynchronous type of motor that depends on electric current to carefully turn the rotor. Torque is definitely produced by electric current in the rotor. The electric current is produced through electromagnetic induction from the magnetic field of the stator windings. In an ACIM, the rotor at all times permanent magnet synchronous motor rotates at a lower speed than the magnetic field. A “PMSM”, which stands for “permanent magnet synchronous engine”, relies on magnets to turn the rotor, which spins at the same acceleration as the PMSM’s internal rotating magnetic field.

There are a few key differences between AC induction Motors and Permanent Magnet Synchronous Motors.