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What will happen if the series field of a differential compound motor is short circuited?

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What will happen if the series field of a differential compound motor is short circuited?

(a) Net flux will decrease

(b) Speed will increase

(c) Speed will remain constant

(d) Speed will decrease

This question was posed to me by my college director while I was bunking the class.

My doubt is from Operating Characteristics of DC Compound Motor in division Characteristics of DC Motors of DC Machines

1 Answer

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Best answer
Right answer is (d) Speed will decrease

The best I can explain: As the series field is short circuited, current through series field becomes zero and MMF due to series field becomes zero. Hence, net MMF in motor becomes greater than previous case, which results in total increase in the flux created and decrease in speed.

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