Electrical Machines

## Characteristics of DC motors - Shunt, Series & Compound

The dc motors are widely used in various applications like variable-speed drives, constant-speed drives,  and many more. For selecting a type dc motor for a particular application it is very important to study the character…

## Losses in DC Machine - Copper, Iron & Mechanical Losses

In a dc machine, the given input energy will be not equal to output energy i.e., the output energy will be always less than the input energy, thereby reducing the efficiency. The whole electrical input is not available at t…

## Starting of DC Motor - Necessity or Need for DC Motor Starter

At starting when a rated voltage is applied across the stationary armature terminals of the dc motor, it draws more current comparatively greater than rated current. When such heavy currents pass through the armature windin…

## Methods of Reducing Armature Reaction in DC Generator

In the last article, we have seen the phenomenon of armature reaction in a dc generator . There are various effects in the dc generator due to armature reaction. Due to the demagnetizing effect of armature flux on the field…

## Armature Reaction in a DC Generator & its Effect

In the last article, we have seen the working principle of dc generator and how we obtained the dc voltage at the output terminal. Now let us see the armature reaction of a dc generator. What is Armature Reaction ?      …

## Demagnetising and Cross-magnetising Conductors & its Equation

When the field winding of a dc generator is excited, a flux with uniform distribution in the air-gap of the dc generator is produced. Once the generator is loaded, load current flows through the armature conductors and set …

## Types of DC Motors - Shunt, Series & Compound Motors

Basically, there is no difference in the construction of a dc motor and dc generator. A dc motor gives a mechanical output with input as a dc supply while the dc generator gives dc electrical output with mechanical input. S…

## Double Cage Induction Motor - Construction, Working & Advantages

Generally, the starting torque of induction motors is reasonably not much high. In case of a slip-ring induction motor, the starting torque can be increased by adding external resistance in the rotor circuit. But, we cannot…

## Hybrid Stepper Motor - Construction, Working & Applications

A stepper motor is an electromechanical device that converts a train of input pulses into a train of step movements. In the recent two articles, we have seen about permanent magnet and variable reluctance stepper motors. …