Interested to Buy Any Domain ? << Click Here >> for more details...
without any excitation we can strt any dc or ac moter?
- 6 Answers
- 12650 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 are the safety measures of induction motor?
I NEED RRB APTITUDE QUESTIONS AND MODEL PAPER,PLEASE SEND MY E-MAIL joo28_eee@yahoo.co.in
one electromagnet is called
How do you select the pickup value of the relay?
What is the BS(British Standard)code for 11kv motor
difference between high and low impedance BUS BAR relay??
how is capacitor bank look like
hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?
When calculation of fault current and fault Kva is to be done,why always we use per unit value and why we consider the base kva?
Define open loop control system.
what happen as when voltage drop(or may decrease) ? in case of atomic base theory?
What aturn on methods of scr?
how did i get the competency certificate as electricle supervisor. iam completed my b.tech.but i dnt have any experince, this certificate is required for applyng ongc mangement trainees. what should i do sir please suggested me
2- What are the percentages between excitation currents in phase (R, S and T) in ∆ and Ỵ connections in excitation Current test in transformers?
What Is HO factor in power selection
