Q4/ We wish to stop a 120 hp. 240 V. 400 r/min motor by using the dynamic breaking circuit shown in Fig. 3. If the normal armature current is 400 A, calculate the following: 1. The value of the breaking resistor R if we want to limit the maximum breaking current to 125 percent of its nominal value. 2. The breaking power when the motor has decelerated to 200 r/min, 50 r/min, and 0 r/min.

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Q: 1. What is the minimum Hp rating of a 220V dc motor to drive a pump that required to discharge water…

A: Given data, Flow rate of pump is given Q=20 m3/min Head is given H=55 ft=55×0.3048=16.76 m,…

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A: Consider the given Question, in it we have do the calculations based on the given data.

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Q: Exercise :1 Assume that the dc motor shown in Fig. 1 draws a current of 10 amperes from the line…

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Q: An iron-vane movement is rated 50 µA, 1000 Q. a. Design a 15 V dc voltmeter. Show the circuit and…

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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.