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Eddy current

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June 21, 2012

Eddy current

Voltage induced in the core material by the alternating flux causes circulating currents known as eddy current.

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Difference between cumulative compound & differential compound wound motors

June 21, 2012

Difference between cumulative compound & differential compound wound motors I n cumulative compound wound dc motor the series field assists the shunt field whereas in differential compound wound motor series field opposes the shunt field

How is a direct connected exciter arranged in an alternator

February 18, 2012

How is a direct connected exciter arranged in an alternator The armature of the exciter is mounted on the shaft of the alternator close to the spider hub. In some cases, it is mounded at a distance sufficient to permit a pedestal and bearing to be placed between the exciter and the hub.

What is the Difference between KW and KVA?

February 19, 2012

What is the Difference between KW and KVA? Electrical utility companies provide volt-amperes to customers, but bill them for watts. Understanding this concept will help you better understand many of the decisions made by project owners and electrical engineers. Since the Power Law shown above lists Watts = Volts x Amps, you may think that the number of volt-amperes should be the same as the number of watts. After all, that's what the Power Law equation states. And it's true when the load is resistive, say an electrical heating element that uses all the power that is delivered to it by changing the electrical energy into heat energy. A motor or a fluorescent light, on the other hand, are reactive loads in that part of the electrical power that goes to them gets absorbed, then returned to the circuit without being used. The reactive portion of the load dissipates no power. Let's look at it a different way. When trying to understand generators that are specified for a p...