YASKAWA SGM7J-A5A Technical Supplement page 91

Servo Motor Heat Dissipation Conditions
The Servo Motor ratings are the continuous allowable values at a surrounding air temperature of 40°C
when a heat sink is installed on the Servo Motor. If the Servo Motor is mounted on a small device compo-
nent, the Servo Motor temperature may rise considerably because the surface for heat dissipation
becomes smaller. Refer to the following graphs for the relation between the heat sink size and derating
rate.
When using Servo Motors with derating, change the detection timing of overload warnings and overload
alarms by referring to the motor overload detection level described in the following manual.

-7-Series AC Servo Drive Rotary Servo Motor Product Manual (Manual No.: SIEP S800001 36)
Note: The derating rates are applicable only when the average motor speed is less than or equal to the rated motor speed.
If the average motor speed exceeds the rated motor speed, consult with your Yaskawa representative.
The actual temperature rise depends on how the heat sink (i.e., the Servo Motor mounting
section) is attached to the installation surface, what material is used for the Servo Motor
mounting section, and the motor speed. Always check the Servo Motor temperature with the
actual equipment.
Important
120
SGM7A-A5A and -01A
100
80
SGM7A-C2A
60
40
20
0 50 100 150 200 250 300
Heat sink size (mm)
120
SGM7A-15A, -20A, and -25A
100
80
60
40
20
0 50 100 150 200 250 300 350
Heat sink size (mm)
120
SGM7A-02D, 04D
100
80
60
40
20
0 5 0 1 0 0 150 200 250 300
Heat sink size (mm)
120
100
SGM7A-70D
80
60
SGM7A-30D
SGM7A-40D, 50D
40
20
0
0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0
Heat sink size (mm)
120
SGM7A-02A and -04A
100
80
60
SGM7A-06A
40
20
0 50 100 150 200 250 300
Heat sink size (mm)
120
100
SGM7A-70A
80
60
SGM7A-30A
SGM7A-40A and -50A
40
20
0
0 100 200 300 400 500
Heat sink size (mm)
120
SGM7A-08D
100
80
SGM7A-10
60
40
20
0
5 0 1 0 0 150 200 250 300 350
Heat sink size (mm)
120
SGM7A-08A
100
80
SGM7A-10A
60
40
20
0
50 100 150 200 250 300 350
Heat sink size (mm)
120
SGM7A-15D, 20D, 25D
100
80
60
40
20
0 50 100 150 200 250 300 350
Heat sink size (mm)
Rotary Servo Motors
SGM7A
73