13 The following details are known about a 250 hp, 230 V, 435 r/min de shunt motor: nominal full-load current: 862 A insulation class: H weight: 3400 kg external diameter of the frame: 915 mm length of frame: 1260 mm a. Calculate the total losses and efficiency at full-load. b. Calculate the approximate shunt field exciting current if the shunt field causes 20 percent of the total losses. c. Calculate the value of the armature resistance as well as the counter-emf, knowing that 50 percent of the total losses at full-load are due to armature resistance. d. If we wish to attain a speed of 1100 r/min, what should be the approximate exciting current?

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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.