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Why a synchronous motor is a constant speed motor?

Electrical Maintenance
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Question added by حازم عبد الحميد محمد دياب , technical office manager , Kased Khair
Date Posted: 2013/06/02
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اسامة الصاوي
by اسامة الصاوي , Head of maintenance department , alfa group

Synchronous motor work on the principle of force developed due to the magnetic attraction established between the rotating magnetic field and the main pole feed.
Since the speed of rotating magnetic field is directly proportional to frequency the motor operates at constant speed.

Syed Hussaini
by Syed Hussaini , Senior Design engineer , private

Th synchronous speed motor's is in MAGNETIC LOCKED  state with the field RMF because of poles of rotor created by external excitation power source,and it rotates with the speed of RMF so it is a constant speed motor and its' speed can not be easily changed? 

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