The synchronous electric motor as the name suggests is synchronized with a particular frequency of the applied current. This motor rotates at a steady speed. Its rotation period precisely equals to an integral number of AC cycles. The synchronous motor contains a multi-phase AC electromagnets on its stators.
This setting of electromagnets creates a magnetic field which rotates the motor in time with oscillations of the line current. The fundamental feature of a synchronous electric motor is that it works at a constant speed due to the magnetic field generated by the stator.
These motors are inherently designed to not self-start. This fact is a fundamental flaw of a synchronous motor. An external source of energy is needed to bring the rotor near the speed of synchronous speed at that point the motor is synchronized and start working.
The speed of this motor's operation is in sync with the supply frequency so for constant supply frequency these motors behave at a constant speed irrespective of the current level of load. These Motors have a unique feature that they can operate under any electrical power factor hence they are used extensively.
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