simatherm IH 045 Manual De Instrucciones página 27

1 Introduction
The simatec IH 045 induction heater is designed to heat bearings or other
metallic, ring-shaped workpieces. The heat causes the bearing to expand,
which eliminates the need to use force during installation. A 90°C (194°F)
temperature difference between the bearing and shaft is generally sufficient
to enable installation. At an ambient temperature of 20°C (68°F), the bear-
ing must therefore be heated to 110°C (230°F).
1.1 Intended use
The IH 045 has been designed to heat rolling bearings. However, other
metal workpieces that form a closed circuit can also be heated. Examples of
acceptable workpieces include bushings, shrink rings, pulleys, and gears.
All bearings that fit over the inductive coil and between the vertical supports
with the top yoke in place can be heated using the IH 045. In addition,
smaller bearings can be placed over either of the three standard yokes. See
the illustrations at the beginning of this manual for examples.
1.2 Principle of operation
The IH 045 generates heat by means of
a large electrical current that is mag-
netically induced in the workpiece by a
coil within the heater. The high voltage,
low current electricity flowing through
the large number of windings in the
inductive coil induces low voltage, high
current electricity in the workpiece. Be-
cause the workpiece has the electrical
characteristics of a coil with a single,
short-circuited winding, the high current
generates heat within the workpiece.
Because the heat is generated within
the workpiece, all of the heater compo-
nents remain cool.
© simatec ag Induction Heater IH 045 27