If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree.

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If the Brsh of DC motor is shifted by 90 deg, then MNA will
shift by --degree.

Question Posted / sandeep

5 Answers
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If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree. ..

Answer / rakesh kumar

mna refers to the axis along which the resultant flux is
0 , which coincides with the geometric neutral axis when no
armature current flows but the flow of armaue current
shifts the 0 flux position or the mna in the direction of
rotation in a generator and opposite to it in a motor ,
ideally the brushes should be along the mna as then it
would be unde the influence of no rotational emf induced
due to earlier pole once the the coil crosses the brush or
undergoes commutation , the shift of brushes has got
nothing to do with the shift of mna that is the mna should
remain at the same position , however for the sparkless
commutation mna shoild be along the brush and hence it
would be good if the mna also gets shifted by 90 .

Is This Answer Correct ?

7 Yes

0 No

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree. ..

Answer / shailesh jadon

there is no effect of shifting brushes on the mnp . the mnp
basially depends on the position of poles

Is This Answer Correct ?

4 Yes

0 No

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree. ..

Answer / vinit

i am satisfied with mr .rakesh and want to add the.shifting of
mna depends only on armature current(or load current)then how can be decided that mna has sifted by 90?

Is This Answer Correct ?

0 Yes

1 No

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree. ..

Answer / sandeep

i expect answer to 90. please justify

Is This Answer Correct ?

2 Yes

4 No

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree. ..

Answer / m raviteja

mna also shifted to 90 degrees

Is This Answer Correct ?

2 Yes

4 No

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