direct online starter

Direct On-line Starter (DOL)

As we have seen in the working of three-phase induction motor, when three-phase supply is given to the stator, a rotating magnetic field produced and the rotor starts rotating. At…

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Cooling Methods of Transformer

Cooling Methods of Transformer

A transformer is a static device used to transfer the electrical energy from one voltage level to another voltage level. As we have seen in the construction of the transformer,…

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Load Test on single phase transformer

Load Test on Single-Phase Transformer

Before starting the Load Test on Single-Phase Transformer , let’s define the voltage regulation. Voltage Regulation When a transformer loaded with a constant primary voltage, the secondary voltage varies because…

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Torque equation of DC machine

Torque Equation of DC Motor

The term torque is a quantitative measure of the tendency of a force to cause a rotational motion. It is a turning and twisting moment of a force about an…

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Difference Between Squirrel Cage and Phase Wound Induction Motor

Difference Between Squirrel Cage and Phase Wound Induction Motor

According to the construction of the rotor or type of rotor, induction motor classified into two types; Squirrel Cage Induction Motor Phase Wound Induction Motor Squirrel cage induction motor is…

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4 Phase 2 Pole Stepper motor

Stepper Motor

The DC motor rotates continuously when it supplied by the DC source. The direction of rotation depends on the polarity of the supply. But the stepper motor rotations are not…

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What is an Electrical Drive?

What is an Electrical Drive?

The electrical drive was introduced in Russia by B.S. Iakobi in 1838. He designed a  DC electric motor supplied from a DC battery and used to propel a boat. This…

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Types of DC Machine

Types of DC Machine

The DC machine works on Faraday’s Law of Electromagnetic Induction. There are two windings in the DC machine; field winding and armature winding. The circulating current supplied to the field…

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Synchronous Machine_ Construction, Classification, Application, Advantages and Disadvantages

Synchronous Machine: Construction, Classification, Application, Advantages and Disadvantages

The machines classified as AC machine and DC machine. In AC machine, the induction machine and synchronous machine are widely used. In this article, we will discuss the synchronous machine….

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Open circuit test of transformer

Open Circuit Test of Transformer

There are four tests in the transformer. Polarity test Open circuit test Short circuit test Sumpner’s test or back to back test In this article, we will explain the open…

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