Interested to Buy Any Domain ? << Click Here >> for more details...
without any excitation we can strt any dc or ac moter?
- 6 Answers
- 12618 Views
- Bhel, I also Faced
- E-Mail Answers
Answer Posted / guest
The answer to this question depends upon the type of
motor.The excitation means supply needed to establish the
working flux.
AC motors
3 phase Synchronous Motor
Cannot be started without excitation.Because the magnetic
locking(which is necessry for continous rotation) between
rotating stator field(created due to balanced 3 phase
supply to stator) and rotating rotor field(rotor is being
rotated intially by external means) is not possible without
excitating the field.
3 phase Induction Motor
There is no concept of excitation in this motor.Motor runs
on the principle of induction,So only 3 phase stator
current and rotror bars shorted at end is needed.There is
no need of excitation on rotor bars.
1 phase Induction Motor
There is no concept of excitation in this motor.Only supply
is needed to Stator winding(don't confuse this with
excitation.This is different from excitation).So motor will
run with supply connected to stator.However the stator
winding is splitted into two parts for providing phase angle
(which is necessary for rotation) bewween current flowing
through main and auxiliary windings.
DC motors
AC supply is given to stator winding which is converted
into DC by means of commutator.Field winding, which is
connected in series in case of series motor,
in parallel in case of shunt motor or
in combination in case of compound motor.
In all the three cases excitation is needed to run the
motor.
conclusions:
1)some AC motors(Induction motors: 3 phase and 1 phase) can
started without field where as some AC motor(3 phase
synchronous motor) cann't be started without field.
2)DC motors cann't be started without excitation.
Author:arbelectbit@yahoo.com
| Is This Answer Correct ? | 25 Yes | 1 No |
Post New Answer View All Answers
what is dc mator?types of dc motor?losses in dc motor?what is the mechanical,electrical and commercial efficiency of a dc motor?
What is transmittance?
What will happend if given Vfd out put to step up transformer
How to calculate impedance volt in Transformer?
what is calculation mathod/formaulla for deciding Size of busbar (Copper/ aluminum)for L.T. panel on Various Fault level like 50kA,25kA,10kA
What is voltage divider rule?
What are PLC leader logic program method
why dc is used in control circuit for mv & hv switchgear instead of ac
what does a string of resistors in a series will do?
What is the effect of solar radiation on the design of an Isolated Phase Busduct?
Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?
hi friends if you have any 400KV Substation Erection and installations Drgs please send to me.My email id:kandi.suresh441@gmail.com
wHAT IS CAPACITANCE LATCHING? hOW TO CALCULATE CAPACITANCE LATCHING? hOW TO SOLVE THE PROBLEM IF CAPACITANCE LATCHING APPLIED?
What is evaporator & condencer & compressor
How to know vacuum in vacuum cylinder of breaker in working condition
