Precor C764 Service Manual download pdf (Page 8)

C762, C764, C764i Stairclimber

Page 8

Eddy Current Resistance and the C760 Series Climber

Magnetism

When the disk rotates, it “cuts” the lines of force that make up the magnetic field. As the lines of

force are cut, voltage is induced in the disk. The current produced by this induced voltage is

called eddy current.

How Eddy Current Works

Current flowing through a conductor produces a magnetic field. When the disk rotates, the

magnetic field produced by the eddy current in the disk opposes the magnetic field produced by

the magnet. Opposing magnetic fields repel each other like poles of a magnet repel each other.

This repelling action produces the resistance the user works against when operating the C760

Series Climber.

Increasing the Resistance

When the user presses the WORK LEVEL ▼ key, the current flowing through the magnets

increases. The increase in current increases the strength of the magnetic field. The disk cuts

more lines of force in the magnetic field and a greater voltage is induced on the disk. Because

current is proportional to voltage, the eddy current increases as well.

When the eddy current increases, the magnetic field produced by the eddy current increases and

opposes the magnetic field produced by the magnet with more strength. Because the two fields

are repelling more strongly, the resistance of the climber increases, thus allowing the user’s

speed to decrease.

Decreasing the Resistance

When the user presses the WORK LEVEL ▲ key, the current flowing through the magnet

decreases, causing the strength of the magnetic field to decrease as well.

As the disk rotates and cuts fewer lines of force in the magnetic field, a smaller voltage is induced

on the disk. As the voltage decreases, the eddy current also decreases.

When the eddy current decreases, the magnetic field produced by the eddy current decreases

and opposes the magnetic field produced by the magnet with less strength. Because the two

fields are repelling less strongly, the resistance of the climber decreases and the user’s speed

increases.

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Precor C764 Service Manual Page 8