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Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current greater than full load current)?

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Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current greater than full load current)?

(a) Can be represented by same curve

(b) Above

(c) Below

(d) Cannot be determined

I have been asked this question during an interview.

Enquiry is from Operating Characteristics of DC Compound Motor topic in chapter Characteristics of DC Motors of DC Machines

1 Answer

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Best answer
Right option is (b) Above

The explanation is: Because of φse increasing with Ia, the speed of the compound motor falls much more sharply than the shunt motor. Therefore, the n – armature current characteristic of the compound motor lies above that of the shunt motor for Ia < Ia ( fl) and lies below for Ia > Ia ( fl).

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