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what happen when dc shunt motor field is sudden open in
running condition
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Answer / nanchu
field failure relay will protect the system and motor
supply will become cutoff,it is preventing the series motor
action.
| Is This Answer Correct ? | 4 Yes | 4 No |
Answer / satya
when field winding is removed at that instant motor tends to
go for infinite speeds , but due to the presence of stator
,it stops because the flux is zero
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / darababu
motor stop as there will not be no torque..and protected by relay..
| Is This Answer Correct ? | 7 Yes | 7 No |
Answer / amolkarne
'dc shunt motor' will decrease speed & stop
it is the 'dc series motor' which will rotate at infinately
high sppeed after opening of supply
| Is This Answer Correct ? | 5 Yes | 5 No |
Answer / r.manikanta
when field fails the flux produces is decreases. according
to the condition emf induced in motor is directly
proportional to speed. when field flux decreases the emf
induced is also decreases so the speed decreases.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / sankarnarendra
In general case speed is inversely proportional to flex i.E n will be decrease but in case of torque is directly prop to i current will be zero i.E torque is zero
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / muhammad haseeb
When suddenly field circuit is open then flux will decrease .As flux decrease the speed of the motor increase firstly.Because speed and flux are inversely proportional to each other. And then speed decrease because field current is zero , flux is zero
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / b nandakumar
If the motor is running on load, armature draws more current torque proportional to flux ,Ia
here flux is 0 then Ia increases and is protected by starter.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / andrew cottrell
Of course, the proof of the pudding is in the eating. One has to experiment & see.
But I would guess that the motor would NOT necessarily speed up. Because the motor is coupled to a driven machine which provides a resistance to speed change. I think that the danger lies in a transient over voltage due to the collapse of the flux. This could stress the insulation, and/or cause a flash over across the mica, and therefore between brushes... BUT, I don't know!! I am guessing!
| Is This Answer Correct ? | 0 Yes | 0 No |
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