## Cogging in Induction Motor

Cogging phenomenon is observed in Squirrel Cage Induction Motor during starting for certain combination of Stator and Rotor Slots. In Cogging motor fails to start at all. For better understanding a view of Stator Core Laminations, Stator Core and Rotor of Squirrel Cage Induction Motor...

## Difference between Fuse and MCB

When the electricity is flowing normally, the fuse permits the power to pass unobstructed across its filament, between circuits. If an overload occurs, the filament melts, stopping the flow of electricity. Fuse is a one time use device and melts when excess current passes through...

## Why Series Resonance Circuit Called an Acceptor Circuit?

RLC Series Circuit is shown below. We will consider RLC Series Circuit for Resonance. At Resonance, Impedance of Inductor = Impedance of Capacitor   Therefore, ωL = 1/ωC, where w is angular frequency =2πf   ω2LC = 1   ω2 = 1/LC   Therefore, at...

## How Commutator Convert AC to DC?

A commutator in a DC Machine has alternate bands of Copper and mica. Now when the armature starts to rotate by an external force (in DC Generator), the coils situated in the armature also rotate. The coils are shorted via brush segment with alternate change...

## Crawling in Induction Motor

For understanding Crawling, there are some points which are very important to know. Those points are as follows: Speed of Rotating magnetic flux = 2f/P, where f is frequency of Supply and P is the number of Poles Harmonic magnetic flux travel at a speed...

## Why Skewed Rotor Conductors in an Induction Motor?

As we know that Rotor Conductors of Squirrel Cage Induction Motor are skewed. It is not straight conductor as shown in figure below. Rotor conductors are skewed because of the following reasons: Primarily to prevent the Cogging Phenomenon. It is a phenomenon in which, if...

## Why & When Consumer are Paid from Utility for Consuming Electric Power?

This seems amazing that Consumers are getting paid for consuming electric Power by electric Utilities. But it happens. In this post I will discuss how and when this situation occurs where consumers get paid for consuming electric power. The first thing to know about electricity...

## Smart Grid versus Existing Power Grid

Conventional Power Grid is designed on the idea that Supply Follows Demand. That means, the amount of coal dumped into a thermal power plant in some way depends on the estimated electricity demand at a distant place in addition to transmission losses. What has changed...