Difference between Synchronous Motor and Induction Motor

The basic difference between induction motor and synchronous motor is that induction motor is an asynchronous machine whereas the other one, as the name suggests is a synchronous machine. Following are some important differences between Synchronous Motor and Induction Motor: Synchronous motors operate at synchronous speed (RPM=120f/p) while induction motors operate at less than synchronous … Read more

Linear Induction Motor

Linear Induction Motor (LIM) is an asynchronous motor, working on the same principle an Induction Motor works, but is designed to produce the rectilinear motion, unlike the rotary movement produced by a motor; hence the word Linear Induction Motor. LIM is an advanced version of rotary induction motor which gives a linear translational motion instead of … Read more

Why do Transformers Hum?

Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized. When the magnetization is taken away, it goes back to its original condition. This phenomenon is scientifically referred to as Magnetostriction.     A transformer is magnetically excited by an alternating voltage and current so … Read more

Why Conservator Used in Transformer?

Conservator is a cylindrical tank mounted on supporting structure on the roof of the transformer’s main tank. Function: When transformer is loaded and when ambient temperature rises, the volume of oil inside transformer increases. A conservator tank of transformer provides adequate space to this expanded transformer oil. It also acts as a reservoir for transformer … Read more

Why Induction Motor Star Point not Grounded in Industries?

In any electrical system, we do the neutral grounding at the power source e.g. the star-points of generators or transformers. By keeping the grounded neutrals at the power source, earth fault current will have a return path from the point of short-circuit at downstream to the source. In this way the direction of earth fault … Read more

Doubly-fed Induction Generators – Wind Turbines

Doubly-fed Induction Generators in industry are used to generate electrical power in large wind turbines. This is primarily due to the many advantages of Doubly-fed Induction Generators than other types of generators in applications where the mechanical power provided by the prime mover driving the generator varies greatly e.g. wind blowing at variable speed on … Read more