Servomotor Overload Protection Characteristics - YASKAWA E Series Product Manual

During operation, the gear generates the loss at the gear mechanism and oil seal. The loss depends on the
torque and motor speed conditions. The temperature rise depends on the loss and heat dissipation condi-
tions. For the heat dissipation conditions, always refer to the following table and check the gear and motor
Important
temperatures with the actual equipment. If the temperature is too high, implement the following measures.
• Decrease the load ratio.
• Change the heat dissipation conditions.
• Use forced-air cooling for the motor with a cooling fan or other means.
SGM7A-A5
SGM7A-01
SGM7A-C2
SGM7A-02
SGM7A-04
SGM7A-06
SGM7A-08
SGM7A-10A
5.2.7

Servomotor Overload Protection Characteristics

The overload detection level is set for hot start conditions with a Servomotor surrounding air tem-
perature of 40°C.
SGM7A-A5, -01, -C2, -02, -04, -06, -08, and -10
10000
1000
100
10
Motor speed of
less than
1
0 50
Torque reference (percent of rated torque)
Note: The above overload protection characteristics do not mean that you can perform continuous duty operation
with an output of 100% or higher. Use the Servomotor so that the effective torque remains within the contin-
uous duty zone given in 5.2.3 Torque-Motor Speed Characteristics of the SGM7A-A5 to -10 on page 5-6 or
in 5.2.5 Torque-Motor Speed Characteristics of the SGM7A-15 to -70 on page 5-8.
Model
1/5
• A: 250 mm × 250 mm × 6 mm, aluminum plate
• B: 300 mm × 300 mm × 12 mm, aluminum plate
• C: 350 mm × 350 mm × 12 mm, aluminum plate
Motor speed of
10 min -1 or higher
10 min -1
100 150 200 250 300 350
(%)
5.2.7 Servomotor Overload Protection Characteristics
Heat Sink Size
1/9 or 1/11 1/21
A
B
C
SGM7A-15, -20, -25, -30, -40, -50, and -70
10000
1000
100
10
SGM7A-70
1
0 50 100 150
Torque reference (percent of rated torque)
5.2 Specifications and Ratings
1/33
SGM7A-15, -20, -25,
-30, -40, and 50
200 250 300
(%)
5
5-11