28
29
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 5,000 hours for the motor equipped with gear head. Standard life of the
motor without gear head (round shaft) is 10,000 hours (however, effective life of the oil seal
is 5,000 hours).
Standard life is the designed lifetime predicted based on assumption that it is operated
8 hours/day (service factor: Sf = 1.0) under uniform loading (gear head allowable shaft
torque, motor rated torque) at normal temperature and humidity.
Calculate the standard life when using the gearhead with a motor rotation speed
exceeding 3000 r/min as follows.
Standard life (hours) = 5000 (hours) × 3000 (r/min) / operating speed (r/min)
Service factor (Sf)
Life expectancy =
Standard life
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. In any condition, torque T
1
is not
allowed to exceed the allowable shaft torque T
A
regardless of Sf.
• Motor rotation speed: 3000 r/min or less.
Unit: N
・
m
Model
name
Reduction
ratio
3 3.6 5 6 7.5 9 10 12.5 15 18 20 25 30 36 50 60 75 90 100 120 150 180 200
MBMU5AZAX
MX8G
□
B
0.39 0.46 0.64 0.77 0.96 1.16 1.29 1.61 1.92 2.33 2.59 3.23 3.61 4.33 5.93 7.29
7.84
—
MBMU9A
○
AZ
MZ9G
□
B
MY9G
□
B
0.67 0.81 1.12 1.34 1.69 2.02 2.28 2.54 3.06 3.72 4.11 5.27 6.22 6.96 9.81 11.7 14.7 17.3 19.0
19.6
MBMU1E
○
AZ
MZ9G
□
B
MY9G
□
B
1.01 1.21 1.69 2.02 2.54 3.04 3.42 3.82 4.59 5.58 6.17 7.91 9.34 10.5 14.7 17.5
19.6
* Direction of rotation:
represents that the direction is same as that of motor;
otherwise opposite to that of motor
•
〇
in the part name of motor represents either 1 or 2 which indicates supply voltage.
•
□
in the part name of gear head represents a figure which indicates reduction ratio.
• Motor rotation speed: 3000 to 4000 r/min or less.
Unit: N
・
m
Model
name
Reduction
ratio
3 3.6 5 6 7.5 9 10 12.5 15 18 20 25 30 36 50 60 75 90 100 120 150 180 200
MBMU5AZAX
MX8G
□
B
0.29 0.35 0.48 0.58 0.72 0.87 0.97 1.21 1.44 1.75 1.94 2.42 2.71 3.25 4.45 5.47 6.84
7.84
—
MBMU9A
○
AZ
MZ9G
□
B
MY9G
□
B
0.50 0.61 0.84 1.01 1.27 1.52 1.71 1.91 2.30 2.79 3.08 3.95 4.67 5.22 7.36 8.78 11.0 13.0 14.3 17.0
19.6
MBMU1E1AZ
(
100 V
)
MZ9G
□
B
MY9G
□
B
0.59 0.71 0.99 1.18 1.49 1.78 2.00 2.24 2.69 3.27 3.61 4.63 5.47 6.15 8.60 10.2 12.9 15.4 17.2
19.6
MBMU1E2AZ
(
200 V
)
MZ9G
□
B
MY9G
□
B
0.76 0.91 1.27 1.52 1.91 2.28 2.57 2.87 3.44 4.19 4.63 5.93 7.01 7.88 11.0 13.1 16.5
19.6
* Direction of rotation:
represents that the direction is same as that of motor;
otherwise opposite to that of motor
•
〇
in the part name of motor represents either 1 or 2 which indicates supply voltage.
•
□
in the part name of gear head represents a figure which indicates reduction ratio.
Shaft permissible load
The load should not cause the limits shown in the table below to be exceeded.
Model name
Permissible
overhung load
(W)
Permissible
thrust load
(F)
L
L
2
Attachment side
Thrust load
(F)
Overhung load
(W)
Motor
and
Gear head
Motor
shaft
MBMU5AZAS
100 N
10 N
MBMU9A
○
AS
120 N
20 N
MBMU1E
○
AS
150 N
20 N
Gear
shaft
MX8G type
294 N
49 N
MZ9G type
MY9G type
588 N
147 N
•
〇
in the part name of motor represents either 1 or 2 which
indicates supply voltage.
Permissible load inertia moment
Unit: ×10
−4
kg
・
m
2
Model
name
Reduction
ratio
3 3.6 5 6 7.5 9 10 12.5 15 18 20 25 30 36 50 60 75 90 100 120 150 180 200
MBMU5AZAX
MX8G
□
B
1.25 1.79 3.42 4.90 7.72 11.2 13.8 21.6 30.6 45.2 55.8 86.9 127 183
342
—
MBMU9A
○
AZ
MBMU1E
○
AZ
MZ9G
□
B
MY9G
□
B
5.93 8.47 16.4 23.6 37.3 53.4 67.6 98.3 142 211 257 423 589 847
1684
•
〇
in the part name of motor represents either 1 or 2 which indicates supply voltage.
•
□
in the part name of gear head represents a figure which indicates reduction ratio.