what happen when dc shunt motor field is sudden open in
running condition
Answers were Sorted based on User's Feedback
Answer / tarak
the flux becomes very less dat is only residual
magnetism.as speedinversly proportional to flux d speed
will become very high.
Is This Answer Correct ? | 120 Yes | 20 No |
When field ckt is opened field current will be zero,flux
will be zero,as speed is inversly proportional to speed
becoz of zero flux motor tries to rotate at maximum
(infinite),dangerous speed .motor will be damaged(un rooted
etc..)
Is This Answer Correct ? | 72 Yes | 12 No |
Answer / gajanan
when fied is open then field current will be zero and so
field flux also tends to zero,as speed is inversaly
proportional to flux, motor will rotate at (infinite)high
speed then winding will burn
if as always protection is use or drive used for motor then
it will trip and stops motor and protect it from burning
Is This Answer Correct ? | 53 Yes | 7 No |
Answer / taraka mohan
The speed of the shuntmotor becomes high(uncontrollable)
and the windings are burn
Is This Answer Correct ? | 44 Yes | 10 No |
Answer / tommy
When field ckt is opened field current will be zero,flux
will be zero,as speed is inversly proportional to speed
becoz of zero flux motor tries to rotate at maximum
(infinite),dangerous speed .motor will be damaged(un rooted
etc..)
Is This Answer Correct ? | 18 Yes | 1 No |
Answer / nitin panwar
when a dc motor field is suddenly opened then flux dies out or flux decreases and as speed is inversely proportional to the flux therefore speed increases than the normal speed
Is This Answer Correct ? | 10 Yes | 3 No |
Answer / menu
For a dc shunt motor if field is suddenly opened, no
current flow so no flux and no magnetic field..so according
to MOTOT PRINCIPLE...conductor experiences torque only if
it is placed in magnetic field...hence the speed of motor
decreases slowly due to inertia and finally it stops.
Is This Answer Correct ? | 11 Yes | 7 No |
Answer / nayan mondal
when the shunt field is open the flux becomes near zero, not
reaches the flux zero due to there have some residual
magnetism. so it will runs at very high speed(SPEED
INVERSELY PROPORTIONAL TO FLUX)
Is This Answer Correct ? | 5 Yes | 1 No |
Answer / manoj
when field circuit is open sudden high torque wii develop
due to this as speed is directly proportional to speed
motor runs very fastly than its rated speed
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / anusha
when rield circuit is suddenly opened, as the flux becomes
zero, back emf would become zero, hence high current flows
through armature circuit and the armature winding may
burnout.
Is This Answer Correct ? | 4 Yes | 3 No |
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