In a PMDC motor, when armature is rotated at 100rpm, an emf of 2V is developed across its terminals. For this motor, calculate the armature current flow required to generate a torque of 0.4Nm.

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In a PMDC motor, when armature is rotated at 100rpm, an emf of 2V is developed across its terminals. For this motor, calculate the armature current flow required to generate a torque of 0.4Nm.

nivedithapdvg 20th Oct, 2020

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Answer (1)

Priya 26th Oct, 2020

Required torque (T) = 0.4 Nm

Eb = 2V

Mechanical Power delivered = P = T*w = Eb* Ia

Eb=back emf

Ia = Amateur current

w = Angular frequency

w = 2pi * n /60 = 2pi*100/ 60 = 10.47 rad/seconds

from the previous equation

Ia = T*w/Eb = 0.4 * 10.472 / 2 = 2.0944 A

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