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The shape of the current-torque current characteristics in DC series motor is a __________

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in Electric Drives by (99.8k points)
The shape of the current-torque current characteristics in DC series motor is a __________

(a) Rectangular Hyperbolic

(b) Parabola

(c) Circle

(d) Ellipse

This question was addressed to me in exam.

Question is from Dynamic Braking of DC Series Motors in portion Braking of DC Motors & Induction Motors of Electric Drives

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Right choice is (b) Parabola

The explanation is: The shape of the current-torque characteristics in the DC series motor is a parabola. The motor equation is Eb=Vt-IaRa=Km∅ωm. T=Km∅Ia. ∅∝Ia. T∝Ia^2.

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