2-85
6,000-r/min Servomotors (400 V AC)
The following graphs show the characteristics with a 3-m standard cable and 400-V AC input.
(N.m)
0
0
2000
4000
6000
21.5
4.9
10
20
30
(r/min)
Repeated usage
Continuous usage
R88M-W3K060F
(N.m)
0
0
2000
4000
6000
11
2.45
5
10
15
(r/min)
Repeated usage
Continuous usage
R88M-W1K560F
Repeated usage
0
0
1000
2000
6000
6.5
1.59
4
6
8
Continuous usage
(r/min)
(N.m)
R88M-W1K060F
Repeated usage
Continuous usage
D
Servomotor and Mechanical System Temperature Characteristics
•
W-series AC Servomotors use rare earth magnets (neodymium-iron magnets). The temperature
coefficient for these magnets is approximately -0.13%/
°
C. As the temperature drops, the Servomo-
tor’s momentary maximum torque increases, and as the temperature rises the Servomotor’s
momentary maximum torque decreases. When the normal temperature of 20
°
C and --10
°
C are
compared, the momentary maximum torque increases by approximately 4%. Conversely, when the
magnet warms up to 80
°
C from the normal temperature of 20
°
C, the momentary maximum torque
decreases by approximately 8%.
•
Generally, in a mechanical system, when the temperature drops the friction torque increases and the
load torque becomes larger. For that reason, overloading may occur at low temperatures. In particu-
lar, in systems which use deceleration devices, the load torque at low temperatures may be nearly
twice the load torque at normal temperatures. Check with a current monitor to see whether overload-
Standard Models and Specifications
Chapter 2
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