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three phase synchronous motor
The operation of the three-phase synchronous motor can be summarized as follows:
Three-phase AC voltage is applied to the stator windings and a rotating magnetic field is certainly produced.
DC voltage is applied to the rotor winding and a second magnetic field is certainly produced.
The rotor then acts like a magnet and is attracted by the rotating stator field.
This attraction exerts a torque on the rotor and causes it to rotate at the synchronous speed of the rotating stator field.
AC synchronous motors are the workhorses of sector. With synchronous electric motor technology, speed is straight proportional to AC insight frequency - for instance, at 120 Vac, 60 Hz, an AC synchronous engine will turn at 72 rpm. This speed could be varied by varying the frequency, although many applications simply make use of gearing or a belt- or chain-drive system to achieve the desired load speed.
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