3 Specifications and Dimensional Drawings
3.1.4 Heat Dissipation Conditions
3-10
3.1.4 Heat Dissipation Conditions
The Servomotor ratings are the continuous allowable values at a surrounding air temperature of 40°C when a
heat sink is installed on the Servomotor. If the Servomotor is mounted on a small device component, the Ser-
vomotor 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.
3.1.5 Holding Brake Delay Time
Holding brakes have motion delay time that varies depending on when the brake is open and when the brake is oper-
ating. The following table shows the brake delay time of each servomotor.
• Example, switching the holding brakes on the DC side
The actual temperature rise depends on how the heat sink (servomotor mounting sec-
tion) is fixed on the installation surface, what material is used for the motor mounting
section, and motor speed. Always check the actual motor temperature.
90 150120
60
300 90 150120
60
300
Heat Sink (mm)
150 250200
100
500
Heat Sink (mm)
100
80
60
40
20
100
80
60
40
20
100
80
60
40
20
Heat Sink (mm)
Derating
Derating
Derating
SGMMV-B3/-B5/-B9 SGMMV-A1/-A2
SGMMV-A3
Make sure the holding brake delay time is correct for your servomotor.
Model Voltage
Brake Release Time
[ms]
Brake Operation Time
[ms]
SGMMV-A1 to A3 24 V 40 100
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