Omron OMNUC G5 R88M-K series User Manual page 136

3-3 Servomotor Specifications
*1. These are the values when the motor is combined with a drive at normal temperature (20C, 65%). The momentary
maximum torque indicates the standard value.
*2. Applicable load inertia.
 The operable load inertia ratio (load inertia/rotor inertia) depends on the mechanical configuration and its rigidity.
For a machine with high rigidity, operation is possible even with high load inertia. Select an appropriate motor and
confirm that operation is possible.
 If the dynamic brake is activated frequently with high load inertia, the Dynamic Brake Resistor may burn. Do not
repeatedly turn the servo ON/OFF while the dynamic brake is enabled.
*3. The allowable radial and thrust loads are the values determined for a limit of 20,000 hours at normal operating
temperatures.
The allowable radial loads are applied as shown in the following diagram.
3
*4. This is a non-excitation brake. (It is released when excitation voltage is applied.)
*5. The operation time is the value (reference value) measured with a surge suppressor (CR50500 by Okaya Electric
Industries Co., Ltd.).
*6. Direct current switching with a varistor (TNR9G820K by Nippon Chemi-Con Corporation).
*7. Direct current switching with a varistor (Z15D151 by Ishizuka Electronics Co.).
Torque-Rotation Speed Characteristics for 1,000-r/min Motors
 1,000-r/min motor (200/400 VAC)
The following graphs show the characteristics with a 3-m standard cable and a 200-VAC input.
• R88M-K90010H/T/F/C
(900 W)
Power supply voltage
(N • m)
dropped by 10%
19.3 (1600)
20
Momentary operation range
8.59 8.59
10
Continuous operation range
0 1000
Temperature Characteristics of the Motor and Mechanical System
 OMNUC G5-Series AC Servomotors use rare earth magnets (neodymium-iron magnets). The
temperature coefficient for these magnets is approx. -0.13%/
As the temperature drops, the motor's momentary maximum torque increases, and as the
temperature rises, the motor's momentary maximum torque decreases.
 The momentary maximum torque rises by 4% at a normal temperature of 20
temperature of -10
the magnet warms up to 80
 Generally, when the temperature drops in a mechanical system, the friction torque and the load
torque increase. For that reason, overloading may occur at low temperatures.
In particular, in systems that use a Decelerator, the load torque at low temperatures may be nearly
twice as much as the load torque at normal temperatures.
Check whether overloading may occur during starting at low temperature.
Also check to see whether abnormal motor overheating or alarms occur at high temperatures.
 An increase in load friction torque seemingly increases load inertia.
Therefore, even if the drive gains are adjusted at a normal temperature, the motor may not operate
properly at low temperatures. Check to see whether there is optimal operation even at low
temperatures.
3-55
Radial load
Thrust load
Shaft center (LR/2)
• R88M-K2K010H/T/F/C
(2 kW)
(N • m)
47.7
19.3 (1800)
50
14.0
Momentary operation range
25
19.1
8.0
4.3
Continuous operation range
2000 (r/min) 0

C. Conversely, the momentary maximum torque decreases about 8% when

C from the normal temperature.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
• R88M-K3K010H/T/F/C
(3 kW)
Power supply voltage
(N • m)
dropped by 10%
(1400) 47.7 (1600)
28.0
19.1
18.0
9.6
1000 2000 (r/min)

Power supply voltage
dropped by 10%
71.7 (1400) 71.7 (1600)
70
Momentary operation range
40.0
35 28.7 28.7
20.0
Continuous operation range
14.0
0 1000 2000 (r/min)
C.

C compared to a