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Field weakening control method is used for the speed _________

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Field weakening control method is used for the speed _________

(a) Above rated speed

(b) Below rated speed

(c) Can be used anywhere

(d) Can’t tell

I got this question in homework.

Asked question is from DC Motor Basics -2 topic in portion DC Motors of DC Machines

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The correct choice is (a) Above rated speed

To explain I would say: By reducing of field current, flux will also reduce, because flux is directly proportional to the field current passing through the winding. As speed is inversely proportional to flux, so this method can be used for only above rated speed.

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