A shunt motor was tested by means of a pony brake having a length arm of 4 ft and a tare weight of 6.3 lbs. The current drawn by the machine from a 250-V line was 59.0 A when the scale reading was 24 lbs and the speed of the motor was 1200 rpm. The armature and shunt field resistances of the machine are 0.1 ohm and 240 ohms, respectively. Determine the following: Torque of the motor, lb-ft Output power, HP counter emf, volts power developed, watts  rotational losses, watts

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DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.