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DC current to rotor-timing


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#1 Akin

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Posted 27 February 2006 - 09:28 PM

Hello,
i will really apriciate if some one can help me to find the right timing for applying the DC to rotor during startin of the motor.

i know that (DC) field current to the rotor of a
synchronous motor should be applied to make the rotor poles slip and synronize with stator field.but how can i decide the timing for this?

e.g if the starting time of the 4 ople 50Hz 800kw motor is 7 sec when should be the DC applied?
what happens if i wait for 15 sec? or apply the DC after 4 sec?

#2 Tua

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Posted 17 March 2006 - 07:47 AM

Hello Akin!

Why do you ask? if you have time 7 second, you can start your DC auxiliary generator after this time.
I think if you start your DC auxiliary generator after 4 second your big synchronous motor can be stopped and broken down if you don't swith off power supply. If you wait 15 seconds, you will spend the work time only.




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