Yaskawa V1000 Finless Type - Manual (Page 23)

6 Selecting an External Heatsink
YASKAWA ELECTRIC TOBP C710606 21E YASKAWA AC Drive - V1000 Finless Installation Guide 23
NOTICE: Due to uneven compound thickness, uneven heat generation across the heatsink plate or other
factors, the actual heatsink plate temperature (monitored in U4-08) can be slightly different from the
calculated value. An oH drive fault may occur if the heatsink plate temperature exceeds the maximum
allowable value.
◆
Heatsink Selection Example
This example shows heatsink selection for a CIMR-V 2A0006 drive in Normal Duty (ND)
mode.The data required are listed in the table below.
Item Value
P
Loss
27.5 W
T
HSP_max
90 °C
T
Amb
40 °C
R θ
HSP
0.05 K/W
R θ
HSP-EHS
A
th
H = 128 mm, D = 68 mm,
A
th
= 0.7 x 0.128 m x 0.068 m = 6.1 x 10 -3 m 2
λ
Comp
0.8 W/(mxK)
Thermal conductivity of “Thermal Compound G746” (Shin-Etsu Chemical Co.,
Ltd)
d
Comp
Recommended compound thickness: 100 μm
R
θ
HSP_EHS
= = 0.02 K/W
100
μm
0.8 W/(m K)
× 6.1 × 10
-3 m 2