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DC Motors

Working Principle of DC Motor with Single Loop Model

October 19, 2019April 4, 2019

Before going through the detailed study of the working principle of DC motor, we may recall the expression of force acts in a current carrying conductor in a magnetic field. Whenever we place a current …

Read moreWorking Principle of DC Motor with Single Loop Model

Torque in DC Motor (Armature Torque and Shaft Torque)

June 12, 2019April 11, 2019

Before discussing regarding torque in dc motor, let us recall the concept of torque for reference. The torque means the turning moment or twisting moment of force about an axis. We measure a torque as …

Read moreTorque in DC Motor (Armature Torque and Shaft Torque)

Voltage Equation, Back EMF, Power Equation of DC Motor

September 13, 2019April 4, 2019

Before going directly to the voltage equation of a DC motor, we may recall the significance of back EMF in the motor. Because the concept of back EMF in a DC motor is very essential …

Read moreVoltage Equation, Back EMF, Power Equation of DC Motor

Characteristics of DC Motors (Shunt, Series & Compound)

June 12, 2019April 12, 2019

Before discussing the characteristics of DC motors, let us recall the expression of speed and torque of a DC motor. Because these two relationships are quite essential for understanding the characteristics of a DC motor. …

Read moreCharacteristics of DC Motors (Shunt, Series & Compound)

Losses of DC Motor and Efficiency of DC Motor

October 30, 2019April 13, 2019

Since DC motor is a machine it must have some losses during its operation. As the current flows through armature windings and field windings, there are certain copper losses. Since the current alters its direction …

Read moreLosses of DC Motor and Efficiency of DC Motor

Speed Control of DC Motor (Shunt Motor and Series Motor)

June 12, 2019April 6, 2019

Before discussing the speed control of dc motor, let us first establish the expression of the speed of a dc motor. The voltage equation of a DC motor is Where Eb is the back EMF, …

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Applications of DC Motor (Shunt and Series Motor)

September 10, 2019April 12, 2019

There are mainly two types of dc motors. These are shunt DC motor and series DC motor. There is another type of dc motor which has features of both shunt and series motor.  Since it …

Read moreApplications of DC Motor (Shunt and Series Motor)

Testing of DC Machines (DC Motors and DC Generators)

August 15, 2019April 14, 2019

There are different methods of testing of dc machines. Brake Test of DC Machine Brake test is a direct method. We apply here a brake to a water-cooled pulley mounted on the motor shaft. We …

Read moreTesting of DC Machines (DC Motors and DC Generators)

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