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In the magnetic drag type of tachometer a transducer produces an analog signal in the form of a continuous drag due to eddy currents induced in an aluminium cup
The induced current is proportional to speed

Construction And Working

It consists of a rotor which is coupled to the rotor shaft of the machine whose speed is to be measured
A permanent magnet is attached to the rotor which rotates within an aluminium cup alongwith the rotor
A spindle is attached to the aluminium cup to which a pointer is fixed as shown in figure
A h ....etc

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To get full information or details of eddy current brakes seminar report please have a look on the pages

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http://seminarsprojects.net/Thread-eddy-current-brake-full-report?pid=44970

http://seminarsprojects.net/Thread-eddy-current-brake-full-report?pid=25430

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i want to get a powerpont presentation on eddy current tachometer ....etc

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EDDY CURRENT BRAKES

EDDY CURRENT:
It is a swirling current set up in a conductor in response to a changing magnetic field.
By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change

Eddy Current Brakes
It slow an object by creating eddy currents through emi which create resistance, and in turn either heat or electricity.
Braking action is made by varying the strength of the magnetic field.
A braking force is possible when electric current is passed through the electromagnets.

THEORY OF OPERATION
Edd ....etc

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eddy current heating ppt

Abstract

Eddy currents (also called Foucault currents) are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude o ....etc

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Transformer Basics
An electrical device that transfers energy from one circuit to another purely by magnetic inductive coupling.

Review of transformer losses
No load Loss (Excitation Loss) includes the hysteresis loss and eddy current loss.
excitation loss: energy lost by reversing the magnetic field in the core by the alternating AC.
mechanical loss: bearing friction,brush friction and windage loss

Load Loss (Impedance Loss)
Stray loss: It includes distortion of air-gap flux and also due to the due to non uniform d ....etc

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hi
you can read more on 'Eddy Current brakes' from the below thread.

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