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Consider a magnetic relay with linear magnetization curve in both of its open and closed position. What happens to the electrical energy input to the relay, when the armature moves slowly from open position to closed position?

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Consider a magnetic relay with linear magnetization curve in both of its open and closed position. What happens to the electrical energy input to the relay, when the armature moves slowly from open position to closed position?

(a) Welec=Wfld

(b) Welec=Wmech

(c) Welec=Wmech/2+Wfld/2

(d) Welec=0

This question was addressed to me in semester exam.

Query is from Singly Excited Magnetic Systems in chapter Magnetic Circuits of Electrical Machines

1 Answer

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Correct choice is (c) Welec=Wmech/2+Wfld/2

To explain I would say: For the above mentioned case, Wfld=Wmech and Wfld=Welec/2 hence, option “c” is the correct answer.

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