what is the principal of starting of a three phase induction
motor.
- 2 Answers
- 5119 Views
- Moser Baer, I also Faced
- E-Mail Answers
Answer Posted / iamdon
When a 3 phase balanced supply is given to the 3 phase
balalced sator winding,a rotating magnetic field of
constant amplitude is produced.
Rotating field cuts the stationary rotor conductor.So emf
induced in conductor according to Faraday's laws.The rotor
conductors are short circuited.So current starts flowing in
conductor according to Lenz law.
As we know the EFFECT will always OPPOSE THE CAUSE.Here the
EFFECT IS THE CURRENT INDUCED and the CAUSE IS RELATIVE
MOTION between rotating magnetic field and stationary
conductor on rotor.So the torque acting on the rotor
conductor is in such a way that it will oppose the cause.So
rotor starts rotating in the SAME DIRECTION as that of
rotating magnetic field as long as there is relative motion
between two.Rotor will never catch the field so it continue
to run.Due to this reason Induction Motor is self starting.
This principle is similer to transformer.Hence Induction
motor is also called as Rotating Transformer.
Author:arbelectbit@yahoo.com
| Is This Answer Correct ? | 8 Yes | 0 No |
Post New Answer View All Answers
what is the acceptable limit value for Desolve Gas Analysis/
Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?
how to test the electrical panel.ht lt mcc pcc.
What is excitation in case of dc motor?
Why derivative controller is not used in control systems?
how the works electronic energy meter?
How to design the earth grid for lightning protection in an industry
1.what is the reason for transformer and lightning arrester blast in 33kv system
Why slip ring ind. motor power consumption is low compare to induction motor .same 90 kw motor used same load output
How to calculate multiplication factor in kva example 500kva ans pls ?
when generator short circuit condition, the current how dissipates. or at short circuit voltage not available then current how can flow?
1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?
Is there a possibility to use such a treshold voltage for the NMOS part of a CMOS circuit that during the switching it will start conducting only after the PMOS part will be already closed, by this eliminating the leakedge current? Please note, I'm not asking about the well bias in standby mode, but about the "antileakedge" measures during normal operation.
What is oscillator circuit?
How many gap between finger contact in a.c.b. and v.cb.?
