(c) A DC shunt motor with compensating windings as shown in Figure Q3(e) has a rating of 70 hp, 270 V and 1350 rpm with an armature resistance of 0.05 2. The field circuit, Red + Re has a total resistance of 3002 which produces a no- load speed of 1400 rpm while the shunt field winding has 1500 turns per pole. (1) Find the induced torque if the input current is 100 A and 200 A. PE (ii) Plot the torque-speed characteristic curve of the motor by using the result obtained in Q3(c)(i). Analyze your findings.

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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.