Lust CDA34.006 - Project Planning Notes, Cold Plate

CDA3000 Operation Manual
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A.4 Project planning
notes, Cold plate
Note: For size 3 (BG3) and above an active cooling surface or
cooler is required. The usual mounting surface or a position
on the machine housing is not adequate.
Subject Project planning notes
Thermal connection to
cooler
• Evenness of contact surface = 0.05 mm
Roughness of contact surface = roughness factor 6.3
• Coat area between inverter module (“cold plate” backing plate) and cooler with heat transfer
compound (coat thickness 30-70µ).
• The temperature in the middle of the inverter module backing plate must not exceed 85 °C.
Distribution of
power loss
Size Power Heat sink Housing
BG 1/2
BG 3
BG 4
BG 5
0.37 to 2.2 kW
3 to 4 kW
5.5 to 7.5 kW
11 to 15 kW
approx. 65%
approx. 70%
approx. 75%
approx. 80%
approx. 35%
approx. 30%
approx. 25%
approx. 20%
Active cooling surface
Size
Power
[kW]
Device basic area
[mm]
Active cooling surface
[mm]
B H a b
BG 1
BG 2
BG 3
BG 4
BG 5
0.37 to 0.75 kW
1.1 to 2.2 kW
3 to 4 kW
5.5 to 7.5 kW
11 to 15 kW
70
70
100
150
200
193
218
303
303
303
50
90
120
65
80
165
200
260
215
300
Thermal resistance
Size
Power
[kW]
Thermal resistance between
active cooling surface and
cooler
R
th
[K/W]
BG 1
BG 2
BG 3
BG 4
BG 5
0.37 to 0.75 kW
1.1 to 2.2 kW
3 to 4 kW
5.5 to 7.5 kW
11 to 15 kW
0.05
0.05
0.03
0.02
0.015
a
b
B
H
Heat transfer
compound
CDA3000
backing plate
Cooler
R
th