Companion Joggers operate on an electromagnetic
principle of operation. An alternating current
(A.C.) passing through a coil causes a rising
and falling magnetic field. The coil is attached
to the jogger base and the magnetic field rising
and falling in this assembly draws on an armature
plate attached to the jogger housing/table assembly.
The base and housing assemblies are separated
by rubber isolators which permit movement between
these two assemblies. The alternating attraction
and release between these assemblies is what
causes the jogger vibration.
The amount of vibration, how hard the coil pulls
on the armature, is controlled be several factors:
The number of turns of wire in the coil; The distance
or gap between the coil and armature and the amount
of current supplied to the coil.
The number of turns of wire in the coil is a fixed
amount and was determined when ordered from the
coil manufacturer. The optimum gap has been determined
through testing done by Challenge engineers. This
leaves current supply to the coil as the only way
to vary the amount of vibration.
Since voltage supply is fixed at the outlet, current
to the coil is controlled by a rheostat that varies
the resistance in the electrical circuit causing
a variation in the strength of the magnetic field
resulting in more or less vibration. A unique feature
of this type of operation is the immediate cease
of action when the power is shut off with no gradual
decline of motion that could cause misalignment
of jogged material.