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The brushes are placed __________

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The brushes are placed __________

(a) along geometrical neutral axis

(b) perpendicular to geometrical neutral axis

(c) along magnetic neutral axis

(d) perpendicular to magnetic neutral axis

I had been asked this question during an online interview.

The above asked question is from Effect of Brush Shift and Compensation Windings topic in section DC Machines of Electrical Machines

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Right answer is (a) along geometrical neutral axis

The explanation: The brushes are placed along geometrical neutral axis so that in ideal conditions commutations take place without sparking. Also placing brushes along the magnetic neutral axis requires consistent variations as load varies which is not desirable.

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