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3.1 Application
3.2 Operating conditions
3.3 Principle of operation
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3. Introduction
Schaeffler induction heaters are intended for heating
bearings, so they can be assembled easily by means of a
shrink fit. Subject to professional assessment, they can also
be used to heat bushings, cogwheels, couplings and metal
objects that form a closed circuit. Bearings and workpieces are
demagnetized automatically after each heating cycle.
Bearings and workpieces can be heated to a maximum
temperature of 240ºC (464°F).
Schaeffler induction heaters are suitable for continuous use.
However, when heating to a temperature of 240°C (464°F), do
not so for more than half an hour.
CAREFUL!
■ Bearings may be heated to a maximum of 120°C (248°F).
■ Precision bearings may be heated to a maximum
of 70°C (158°F). Higher temperatures can affect
metallurgical structure and lubrication, resulting in
instability and failure.
■ Do not use a heater for bearings and workpieces that
are outside the minimum and maximum dimensions
specified in the technical specifications.
■ Never switch off the unit with the main switch while it
is still heating up.
■ Only use the device indoors.
■ Fit for use in an industrial environment, at an ambient
temperature of 0ºC (32°F) to 50ºC (120°F) and humidity of
5 to 90% – non-condensing.
At temperatures below 0°C (32°F), the unit stops operating.
The operation of the heater is based
on inducing a (low frequency) current
in the bearing. This is achieved
by incorporating the bearing as a
secondary winding in a transformer.
The primary winding is connected to
the mains by means of an electronic
controller. The magnetic field induces
a high current (short-circuit current)
through the bearing, which then becomes hot. After each
heating cycle, the bearing or workpiece is demagnetized.
Schaeffler Technologies
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