Interested to Buy Any Domain ? << Click Here >> for more details...
IN 3 PHASE INDUCTION MOTORS SOMETIMES COPPER BARS ARE PLACED
DEEP IN ROTOR WHY..?
- 3 Answers
- 11675 Views
- ONGC, I also Faced
- E-Mail Answers
Answer Posted / raul
This design is known as Deep bar rotor, which is basically
a modified rotor design in Squirrel cage induction motor.
During starting, the rotor frequency (i.e. Fr = slip *
supply frequency) is very high and the rotor reactance
value is very high, due to which the rotor current is
restricted to the near slot rotor copper and the area of
cross section of the conducting rotor conductors reduces
and the net resistance is increased due to which the
starting torque and the slip at which the max. torque takes
place also increases. And as the rotor picks up speed, the
rotor frequency and hence rotor reactance starts decreasing
and the complete deep bars carries uniform current and
torque reached steady state torque.
Another design with the almost the same above principle is
the DOUBLE CAGE ROTOR
| Is This Answer Correct ? | 6 Yes | 1 No |
Post New Answer View All Answers
What is UPS and How do you maintain the UPS Maintenance? Brief Description on UPS maintenance.
in power generator normaly voltagr betwween esth to neutral is 0 but my work place generator show the volatge is 60v any body know why? thanks
what is difference between line differential and transformer differential?
Is it required to lay 2 runs of GI wires along with armoured cables from one power DB Machines of higher rating?
How to calibrate or test an LT Air Circuit breaker 440 volts, 35 KA, 800 Amps ?
what type of earthing do for dry fissure rock?
we are having 110 Kv,250mA Electrostatic precipitators for coal fired boilers. what will be static voltage and current after discharge and what time it will remain before earthing?
1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve
I am applying for NTPC examination.Can we please provide previous paper to my mail prasad.chintala108340@gmail.com
1. How many types of mangers? 2.How many types of capacitors? 3.pls tell me normally types alternator problems?
for 4 MVA , 33K.V/6.6K.V transformer. secondary side the connected load is 3000H.P. What is the rating of capacitor bank to be insttaled.
For electrical designers what are the standard should know? i want learn about this standards. how to get information/reference. anybody help in this regards please.
What is power relay?
How do we calculate transformer oil in liter from the rating of the transformer.
In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring
