simatherm IH 070 - Introduction; Intended use; Principle of operation

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smart mounting

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1 Introduction

The simatec IH 070/090 induction heater is designed to heat bearings that

are mounted with an interference fit onto a shaft. The heat causes the bea-

ring to expand, which eliminates the need to use force during installation. A

90°C (194°F) temperature difference between the bearing and shaft is ge-

nerally sufficient to enable installation. At an ambient temperature of 20°C

(68°F), the bearing must therefore be heated to 110°C (230°F).

1.1 Intended use

The IH 070/090 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 070/090. 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 070/090 generates heat by me-

ans of a large electrical current that is

magnetically 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. Because the

workpiece has the electrical characteri-

stics of a coil with a single, short-circui-

ted winding, the high

current generates heat within the

workpiece. Because the heat is

generated within the workpiece, all of

the heater components remain cool.