history of induction type instruments, review of induction type instruments, current information about induction type instruments

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Electrical Engineering

history of induction type instruments, review ofinduction type instruments, current information about inductiontype instruments

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Q ansWe use induction type instrument for AC measurement only Thisis because the induction phenomenon only occurs in AC An inductioninstrument has multi use For example we use the instruments asammeters voltmeters wattmeter and energy meters Induction typeinstruments essentially have an electromagnet to produce therequired magnetic field AC in the electromagnet produces changingflux between its poles Here we place one aluminum disc oraluminum drum in the magnetic field Hence the changing fluxlinks with the aluminum disc As a result the flux induces an eddycurrent on the disc This eddy current interacts with the fluxwhich has induced it Consequently there is a mechanical torqueacting on the disc This mechanical torque rotates the discPRINCIPLE When adisc or drum of a nonmagnetic conducting material is placed in arotating magnetic field eddy currents are induced in disc or drumThe torque produces with the reaction of rotating magnetic fieldand eddy current The relation between torque eddy currentrotating flux is given belowT i2Similarly the emf produced at the point two interacts with thealternating current at point one resulting in the See Answer

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