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
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)
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
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)
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 …
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, …
Read moreSpeed Control of DC Motor (Shunt Motor and Series Motor)
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 …
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)