a permanent magnet dc motor has an armature resistance of 11 with an applied armature voltage of

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A permanent magnet dc motor has an armature resistance of 1.1 Ω. With an applied armature voltage of 85 V, the motor is observed to achieve a no-load speed of 1740 rpm while driving an armature current of 1.2 A. Calculate: a) The motor constant Kn in V/(rad/sec) and no-load rotational losses. b) The speed (rpm) and efficiency of the motor when the armature voltage is increased to 100 V with the same motor torque in (a). c) The speed of the motor when the armature voltage increased to 100 V with the motor drawing 10 A armature current. (Assume constant rotational losses)

          A permanent magnet dc motor has an armature resistance of 1.1 Ω. With an applied armature voltage of 85 V, the motor is observed to achieve a no-load speed of 1740 rpm while driving an armature current of 1.2 A. Calculate: a) The motor constant Kn in V/(rad/sec) and no-load rotational losses. b) The speed (rpm) and efficiency of the motor when the armature voltage is increased to 100 V with the same motor torque in (a). c) The speed of the motor when the armature voltage increased to 100 V with the motor drawing 10 A armature current. (Assume constant rotational losses)

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