Types of Braking in a DC Motor

types of braking in a dc motor

In this article we shall discuss about the types of  electrical braking in a  DC motor. There are various types of  electrical braking used for DC motor. Electrical braking is preferred  to stop a  DC motor over the mechanical braking because it has many advantages. In electrical breaking, we stop the motor by electrical energy … Read more

What is Plugging or Reverse Current Braking of DC Motor?

plugging of separately excited dc motor with braking resistor

In Plugging or Reverse Current Braking, supply polarity of  armature voltage of  DC motor is reversed to rapid stop the motor. The armature voltage(V) and back EMF (Eb) acts in the same direction during plugging. In plugging motor exerts opposite torque to retard its speed. The application of the plugging is to immediately stop the DC motor or … Read more

Derivation of EMF Equation of a DC Generator

EMF equation of DC machines

EMF Equation of DC Generator and DC Motor When we apply DC  voltage to armature of a DC motor, an back emf or counter emf generates. The polarity of the  back emf is just opposite to the applied DC voltage. Therefore, the back EMF opposes the applied armature voltage. The back EMF limits the armature … Read more

Speed Regulation of DC Motor | Definition and Formula

speed of dc motor-equation

The speed of DC motor decrease with increase of load on motor. This is not desirable. Therefore, there must be lesser speed difference between no-load to full load operations. In fact, every moving machine has some drop in the speed with load increase.  It is desired that the motor speed should be constant throughout the … Read more

What is Shaft Torque of DC Motor?- Definition, Formula and Solved Problem

shaft power in BHP

The actual torque available at the motor shaft for driving the mechanical equipment is known as shaft torque(Tsh). In fact, the same electromagnetic or gross torque(Ta) developed by DC motor can not be available at the shaft, however it is somewhat less than the electromagnetic torque. The reason of this is that some part of … Read more