Most pumps and fans operating in commercial and commercial applications are currently driven by AC induction motors. “ACIM”, which stands for “alternating current induction モーター”, can be an apermanent magnet synchronous motor synchronous type of motor that relies on electric current to turn the rotor. Torque 
is usually produced by electric energy in the rotor. The electric energy is generated through electromagnetic induction from the magnetic field of the stator windings. In an ACIM, the rotor at all times rotates at a lower speed than the magnetic field. A “PMSM”, which means “permanent magnet synchronous engine”, depends on magnets to carefully turn the rotor, which spins at the same quickness as the PMSM's inner rotating magnetic field.
There are some key differences among AC induction Motors and Permanent Magnet Synchronous Motors.
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