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How many rules are to be followed while the flux plotting by method of curvilinear squares?

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in Design of Electrical Machines by (687k points)
How many rules are to be followed while the flux plotting by method of curvilinear squares?

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me during an interview.

My question is taken from Field Form, Harmonic Analysis of Flux Distribution Curve in portion Principles of Magnetic Circuit Design of Design of Electrical Machines

1 Answer

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Best answer
Right choice is (b) 3

The best I can explain: The flux lines leave and enter from surfaces, bounding the gap, at right angles if it is assumed that iron has infinite permeability as compared with air and then the flux and equipotential lines intersect at right angles. The flux and the equipotential lines are so drawn that each flux is divided into equal number of curvilinear squares.

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