A permanent-magnet DC motor has the following specifications:      Motor Armature Supply Voltage = VA = VM = 36 V      Motor Armature Resistance = RA = 19 Ω      Motor Armature Current = IA = 850 mA      Motor back emf proportionality constant = Kb’ = 1.6 x 10  ̶  3 V/rpm      Find the speed (NM) of the motor.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.