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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

Explain how voltage is induced in a permanent magnet pickup coil as the reluctor approaches alignment with the pickup coil.

To determine

The way in which the voltage is induced in a permanent magnet pickup coil as the reluctor approaches alignment with the pickup coil.

Answer

As the reluctor approaches alignment with the pickup coil, its tooth gets aligned with the core of pickup coil and repels the magnetic field. Hence the magnetic field is forced to flow through the coil and pickup core. As the tooth passes the core, the magnetic field lines get expanded. This action is repeated every time the tooth passes through the core. The moving lines of magnetic force cut across the coil windings and induce a voltage signal.

Explanation

A permanent magnet pickup coil consists of a permanent magnet with fine wire wound around it. The reluctor is attached to a rotating shaft or cable and there are a number of teeth on it depending on the application. An air gap is maintained between the reluctor and the pickup coil.

As the reluctor rotates in front of the pickup coil, its tooth gets aligned with the core of pickup coil and repels the magnetic field. Hence, the magnetic field is forced to flow through the coil and pickup core.

As the tooth passes the core, the magnetic field lines get extended. This action is repeated every time the tooth passes through the core. The moving lines of magnetic force cut across the coil windings and induce a voltage signal.

Conclusion:

Thus, as the reluctor approaches alignment with the pickup coil, its tooth gets aligned with the core of pickup coil and repels the magnetic field. Hence the magnetic field is forced to flow through the coil and pickup core. As the tooth passes the core, the magnetic field lines are able to expand. This action is repeated every time the tooth passes through the core. The moving lines of magnetic force cut across the coil windings and induce a voltage signal.

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