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Checking load and use condition
Check the use condition for extended use of the product. Particular use conditions may
lead to heating or damage to the shaft. Fully check use conditions, and use the motor in a
permissible range.
Standard life
Standard life is 10,000 hours for the motor equipped with gear head (MB8G and MB9G).
(Standard life of sealing performance of oil seal is 5,000 hours.)
Standard life refers to design life for operation 8 hours per day (service factor: Sf = 1.0) at
a normal temperature and humidity, under uniform load (permissible shaft torque of gear
head and rated torque of motor).
* Standard life in the case of 3000 to 4000 r/min rotation speed of the motor, please
calculated by the following formula.
Standard life (hours) = 10000 (h) × 3000 (r/min) / rotation speed (r/min)
<Information>
Repeated forward/reverse operation with motor shaft rotation angle below 45 degrees
causes fretting of bearing (partial wear due to bearing out of grease), and is not advisable.
It does not apply if operation is available to rotate the motor shaft above 45 degrees at an
appropriate interval more than once a day.)
Oscillation due to inappropriate setting of gain, also causes fretting.
Note that gear head shaft is also subject to this restriction.
Service factor (Sf)
Life expectancy =
Service factor (Sf)
Service factor (Sf) varies with impact of load and operation time. The table below shows
how the service factor value depends on load condition.
Type of load Typical load
Service factor
5 hours/day 8hours/day 24hours/day
Constant Belt conveyor, One-directional rotation 1.0 1.0 1.5
Light-impact Start/Stop, Cam-drive 1.2 1.5 2.0
Medium-impact Instant FWD/REV, Instant stop 1.5 2.0 2.5
Heavy-impact Frequent medium-impact 2.5 3.0 3.5
Permissible torque
The required gear head allowable shaft torque T
A
can be determined based on the service
factor and actual load torque T
1
.
T
A
= T
1
× Sf
Select a gear head/motor so that the required torque (continuous value) is equal to or lower
than the allowable shaft torque shown in the table below.
• Motor rotation speed: 3000 r/min or less.
Unit: N
・
m
Model name
Reduction
ratio
5 10 15 20 30 50
MBMU5AZAB
／
MB8G
□
BV
0.71 1.4 2.2 2.8 4.0 6.8
MBMU9A
○
AB
／
MB9G
□
BV
1.2 2.5 3.6 4.9 7.0 11.6
MBMU1E
○
AB
／
MB9G
□
BV
1.9 3.7 5.6 7.4 10.7 17.7
• Motor rotation speed: 3000 to 4000 r/min or less.
Unit: N
・
m
Model name
Reduction
ratio
5 10 15 20 30 50
MBMU5AZAB
／
MB8G
□
BV
0.53 1.1 1.7 2.1 3.0 5.1
MBMU9A
○
AB
／
MB9G
□
BV
0.90 1.9 2.7 3.7 5.3 8.7
MBMU1E1AB
（
100 V
）／
MB9G
□
BV
1.1 2.1 3.3 4.3 6.2 10.3
MBMU1E2AB
（
200 V
）／
MB9G
□
BV
1.4 2.8 4.2 5.6 8.0 13.3
* Direction of rotation: represents that the direction is same as that of motor;
otherwise opposite to that of motor
•
○
in the part name of motor represents either 1 or 2 which indicates supply voltage.
•
□
in the part name of gear head represents a gure which indicates reduction ratio.
Shaft permissible load
The load should not cause the limits shown in the table below to be exceeded.
Gear
head
size
Model name
Permissible
overhung load
(W)
Permissible
thrust load
(F)
L
L
2
Attachment side
Thrust load
(F)
Gear head
□
80
mm
MB8G5BV
245 N
98 N
MB8G10BV, MB8G15BV
MB8G20BV
343 N
MB8G30BV, MB8G50BV
539 N
□
90
mm
MB9G5BV
294 N
147 N
MB9G10BV, MB9G15BV
MB9G20BV
490 N
MB9G30BV, MB9G50BV
637 N
Permissible load inertia moment
Unit
：
×10
−4
kg
・
m
2
Model name
Reduction
ratio
5 10 15 20 30 50
MBMU5AZAB
／
MB8G
□
BV
3.42 13.8 30.6 55.8 127 342
MBMU9A
○
AB
／
MB9G
□
BV
MBMU1E
○
AB
／
MB9G
□
BV
16.4 67.6 142 257 589 1684
<Information>
•
○
in the part name of motor represents either 1 or 2 which indicates supply voltage.
•
□
in the part name of gear head represents a gure which indicates reduction ratio.
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