A 100-hp, 250- V, 400-A shunt DC motor with an armature resistance of 0.05Ω. It is desired to design a starter circuit for this motor which will limit the maximum starting current to 150% of itsrated value and which will switch out sections of resistance as the armature current falls to its rated value. a) How many stages of starting resistance will be required to limit the current to the range specified? b) What must the value of each segment of the resistor be? At what voltage should each stage of the starting resistance be cut out

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A: The answer as given below steps:

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A: The current and voltage drop across the terminals is shown in the following figure.

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Q: See attached.

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A: The solution is as follows.

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A: given that  voltage = 250 V current = 400 A power = 100 hp =74600 W Ra =0.05 Ω maximum starting…

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.