Synchronous motors are those that run only at Synchronous speed ie.. constant speed.
1)Synchronous motors are those that run only at Synchronous speed i.e. constant speed. But Motor can run in various speeds. 2)Synchronous motors runs at same speed of magnetic filed. but if one consider case of induction motor the rotor rotates at different speed than revolving magnetic field. there is slip between field and rotor.
Synchronous motors have unmeasureable slip because they stay in sync with the input line frequency.
Becoz it use frequecy to start
Your question can not be answered as it is. Reword the question - is it about induction motors or synchronous motors, for example?
Synchronous motors have no slip. This is because the rotor runs at the same speed as the speed of the rotating magnetic flux of the stator.
William Abbett Lewis has written: 'The principles of synchronous machinery' -- subject(s): Synchronous Electric motors
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ASYNCHRONOUS is a mode whereby events happens irregardless of control. SYNCHRONOUS are this same events but controlled by a timing and/or control
larger synchronous motors start with a squirrel cage and run when dc is applied thru the slip rings small motors can have magnets in the rotor these can accelerate from rest to synchronous speed in a few seconds
Number of poles and supply freqency determines speed of synchronous motor. For speed control of such motors Variable Freqency Drives(VFD) are used.