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

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### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315
BuyFind

### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

#### Solutions

Chapter
Section
Chapter 26, Problem 1RQ
Textbook Problem

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

Expert Solution
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 to Problem 1RQ

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 of Solution

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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