VARIO : Service & maintenance manual- rev. 4.2
Page 3.12
3.6.
ELECTROMAGNETIC BRAKE
This is an eddy current brake, consisting of a flywheel weight and a flat copper disk that rotates in
the air gap of a winding. Variations in the winding current produce changes in the magnetic field,
which in turn varies the eddy currents induced within the copper disk and hence its resistance to
"vertical" movement of the machine.
Two solenoids (
cylindrical-shaped coil composed of a series of very closely wound circular turns of
a single strand of conducting material
) connected in series are supplied by an adjustable direct
current generator to obtain a magnetic field of varying intensity. The inertia disk (flywheel) rotates
between the coils.
As a result of its movement, each sector of the disk is crossed by a magnetic field flux that varies
continuously, giving rise to electromotive forces within it that cause induced currents to circulate.
These currents flow in a direction which opposes the cause that induced them, i.e. the movement of
the disk inside the magnetic field. Consequently, they have a braking effect that slows down the
movement of the disk. The braking effect is intensified as the magnetic field strength of the coils
increases, and therefore with increasing speed of the disk. This operating principle also means that
when the disk is stationary the braking action will be zero.
Unlike the majority of mechanical brakes, which operate by taking advantage of attrition forces,
there electromagnetic brake has no parts subject to wear.
The winding resistance is approx
imately 5Ω Ohm, consequently the brake absorbs a maximum
current of 2.2 A.
3.7.
MAGNETIC BRAKE
This is a non-adjustable magnetic brake; it consists of a stator on which a series of magnets are
arranged with alternating polarities, directed toward the rotor. The rotor is covered with a copper
sheet (high electrical conductivity) so that, when it moves, currents are induced within it
(particularly in the copper) that produces a braking effect.
The higher the stepping speed and/or the stride length during exercise, the greater the braking effect
will be.
Summary of Contents for Vario Excite + 500
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