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baidyanath74
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Join Date: Jul 2010
Posts: 3

Synchronous motor

12/27/2010 5:03 AM

If I put AC Supply in excitation ckt of a synchronous motor , what's happened?
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Alanvaderi
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#1

Re: Synchronous motor

12/27/2010 7:04 AM

Synchronous motor requires no excitation,hence no excittation ckt.
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JRaef
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#5
In reply to #1

Re: Synchronous motor

12/27/2010 11:18 AM

"Synchronous motor requires no excitation,hence no excittation ckt."

???

Do you even know what a synchronous motor is?

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Alanvaderi
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#6
In reply to #5

Re: Synchronous motor

12/27/2010 12:48 PM

I mean it is self excited motors.....
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justinanto1987
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#2

Re: Synchronous motor

12/27/2010 7:20 AM

Have a look on working principle of Synchronous motors.

First we are applying 3 phase AC to stator and it produces rotating magnetic field with synchronous speed. Then we are briging the rotor to that speed or closer speed then applying DC then it can run as a constant speed motor.

When rotor having synchronous speed and we are applying DC then it will be a rotating magnet with synchronous speed. No of poles in the rotor and stator will be same in synchonous motor. So in effect both (rotor & stator) magnet field is rotating with same speed and once they get locked we can say synchronisation is happened and motor will continue its rotation with that speed.

Now I am coming to your question for synchronisation instead of DC if we are feeding AC, whether rotor can get locked with stator.............? Think, you will get the answer..

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Anonymous Poster
#3

Re: Synchronous motor

12/27/2010 8:08 AM

it vibrates

humming
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anand14rocks
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Location: Pune, Maharashtra, India
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#4

Re: Synchronous motor

12/27/2010 8:43 AM

poles produced on rotor will be changing. so rotor will not lock with stator rotating mag. field. n there will be no synchronism.

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67model
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#7

Re: Synchronous motor

12/28/2010 4:39 PM

If you have put AC supply into the rotor coils of a SYNCHRONOUS motor, what HAS happened is that you have made a mistake with your wiring! True synchronous motors are run-up to speed by an auxiliary motor or squirrel cage windings and synchronized by applying DC to the rotor. If you meant "what will happen", it depends a lot on the frequency, magnitude and phase of the AC and whether there is any DC and whether the AC supply has a significant source resistance and/or inductance.
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Anonymous Poster
#8

Re: Synchronous motor

12/29/2010 7:07 PM

Salient pole motor will run at a multiple of the input frequency.
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67model (1); Alanvaderi (2); anand14rocks (1); Anonymous Poster (2); JRaef (1); justinanto1987 (1)

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