Why air gap in rotating machines should be small?

Question Posted / iamdon

3 Answers
7975 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Why air gap in rotating machines should be small?..

Answer / sunil guru

THE MAGNETIC FIELD FLUX HAS TO COMPETE THE RELUCTANCE AND RELUCTANCE IS DIRECTLY PROPORTIONAL TO THE AIR GAP ....
SO LESSER THE AIR GAP LESS IS THE LOSSES....

AIR GAP SHOULD BE LESS THAN 5 mm IN DC MC. AND LESS THAN 3 mm IN AC MACHINE

IF THE AIR GAP IS MORE THEN TO ESTABLISH THE MMF THE MACHINE WILL TAKE MORE CURRENT AND HENCE MORE IS THE LOSSES ....

FOR ANY DISAGREEMENT MAIL ME AT parmar20072008@yahoo.com

Is This Answer Correct ?

8 Yes

0 No

Why air gap in rotating machines should be small?..

Answer / iamdon

The working flux travels through both the core and the air
gap.The ampere turn required to overcome the reluctance in
air gap is very large as compared to the iron or core
parts.In rotating machines, about 60-70 % of the total
ampere turns per pole are required for the air gap.So the
air gap length should be AS SMALL AS MECHANICALLY POSSIBLE.

Author:arbelectbit@yahoo.com

Is This Answer Correct ?

7 Yes

1 No

Why air gap in rotating machines should be small?..

Answer / virendra

To reducet the leakage fulx

Is This Answer Correct ?

1 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

send me the upsc conventional papers of 2006

1 Answers Juniper Networks, Siemens,

why exterrnal C.T. protection is used even though ACB& VCB is having inbuild C.T. protection?

2 Answers

1KVA transformer of different frequencies of 50hz,100hz,500hz&1000hz. which one of these transformer has big size? Give reason

16 Answers Ecil, Engineers India, MahaDiscom,

How many 2 ton window A/c can runs on a 125 KVA generator?

2 Answers

how many units will 100 kvar capacitor consume for one day?

2 Answers Philips,

A low wet bulb temperature indicates

0 Answers Caterpillar,

is synchrnous pannel is need for two eqal rating transformers to run in parallel

1 Answers

What is the basic difference between earthing, ground and neutral?

11 Answers Balco, Cognizant,

if reactive power become zero in transmission system then what effect on system.???

3 Answers Sedemac,

a bulb of 100W and anather bulb of 200W , rated supply voltage 230v.when supply voltage is reduced to 100v,which bulb will give more light? and why with calculation?

12 Answers

what methods are used to improve power factor?

3 Answers

Period of infinite continuous fourier series a. N b. N+M c.infinite

1 Answers

For more Electrical Engineering Interview Questions Click Here