Question: A permanent magnet brushed DC motor produces an open-circuit armature voltage of 180 V when driven at a speed of 1000 rpm. The axial

A permanent magnet brushed DC motor produces an open-circuit armature voltage of 180 V when driven at a speed

A permanent magnet brushed DC motor produces an open-circuit armature voltage of 180 V when driven at a speed of 1000 rpm. The axial length of the motor is 300 mm, the mean air ga diameter is 200 mm. If the armature resistance is 2 and the terminal voltage is 400 V, determin the operating speed for an armature current of 25 A.

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