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MT6M15962a
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3.3 Screw tightening
Figure 5-3 shows screw-tightening procedures when mounting an IPM to a heat sink. It is
recommended to tighten all screws with the specified tightening torque.
The specified tightening torque is described in the specification. If the screw tightening torque is
insufficient, the contact thermal resistance may increase and screws loosening may occur during
operation. On the other hand, if the screw tightening torque is excessive, the case may be damaged.
3.4 IPM mounting direction
When an IPM is mounted on an extruded heat sink, it is recommended that the IPM is mounted in
parallel to the extrusion direction as shown in Figure 5-3. The purpose is to reduce the effect of heat
sink deformation.
5-6
Torque
Order
1st time (initial tightening)
2nd time (permanent tightening)
1/3 of specified torque
100% of specified torque
①
→
②
②
→
①
Fig.5-3 IPM mounting method
(a) IPM with 2-points mounting
(b) IPM with 4-points mounting
IPM
IPM
Extruding direction
Heat sink
Screw
position
Extruding direction
Heat sink
Screw
position
Torque
Order
1st time (initial tightening)
2nd time (permanent tightening)
1/3 of specified torque
100% of specified torque
①
→
②
→
③
→
④
④
→
③
→
②
→
①