Technical Data  Reducers  Small-Size Gear Motor  Selection

Technical Data to Use in Model Selection

1. Service factors

The values for output shaft capacity torque on the specification charts have been calculated based on a service factor of 1.0.

Keeping in mind the operating hours, operating conditions, and load conditions, select a service factor (CF) from the table on the right to calculate the corrected output shaft torque.

Table 1. Service factors ：(CF)

Operating hours 10 hours or less/day 10 hours or more/day
Operation type Intermittent/continuous Intermittent/continuous
Load condition Uniform load without shocks 1 1
Load with light shocks 1 1.2

Note) For loads with medium or large shocks, please contact Tsubaki.

2. Inertia ratio and allowable starting frequency

During start-up, impact torque occurs due to load inertia (also during stopping, for brake-equipped models), and an accident may occur due to the coupling method of the load and the load inertia size. Confirm using the following procedure according to the coupling method of the load and the load inertia.

  • (1)Calculate moment of inertia (I) of load {load inertia (GD2)}
  • (2)Calculate moment of inertia (IL) of load for motor shaft conversion {load inertia (GDL2)}
  • (3)Calculate the inertia ratio (U) of the compact gear motor.

    U = IL IM

    U = GDL2 GDM2

    In{GDM2}：Moment of inertia of the motor shaft of the gear motor {Motor shaft-equivalent inertia }

  • (4)Confirm that the allowable starting frequency is satisfied by referring to Tables 1 and 2.

Table 2. Croise motor inertia ratio and allowable starting frequency

Load characteristics Inertia ratio ：U Allowable start-up frequency times
Without backlash 1
0.5
0.2 or less 		4 times/hr., 4 times/min., 10 times/min.
With backlash, such as a chain 0.5
0.3
0.2 or less 		4 times/hr., 4 times/min., 10 times/min.

Note) For conditions other than in Table 2 above, please contact Tsubaki.

Table 3. GEAR MOTOR, HYPOID MOTOR ：Inertia ratio and allowable starting frequency

Inertia ratio and allowable starting frequency

Inertia ratio = Moment of inertia of load on motor shaft Hypoid motor/gear motor moment of inertia on motor shaft

3. Overhang load of the output shaft

When attaching the sprocket, gear, or belt to the output center shaft, or to the hollow shaft using a case tap, confirm that the overhang load acting on the output shaft is equal to or lower than the allowable O.H.L. of the gear motor.

When using a high-strength toothed belt, do not use the O.H.L. factor shown in Table 4, but take into account the mounting tension in calculating the O.H.L.

Table 4. O.H.L. factors f

Chain Gear, toothed belt V-Belt
1.0 1.25 1.5

Formula 1 . Point of action factor ：Lf

ℓ/Q 0.25 0.38 0.5 0.75 1
Lf 0.8 0.9 1 1.5 2
Solid shaft Hollow shaft (Note )
Solid shaft Hollow shaft

Note) Q of hollow shaft: Refer to Table 5 below for standard length.

Table 5. Standard length ：Q

Hypoid Motor

Model No. Reduction ratio Q
HMMT40H 5 ～ 240 28
HMMS40H 5 ～ 240
HMMT60H 5 ～ 240 36
HMMS60H 5 ～ 240
HMMT90H 5 ～ 240
HMMS90H 5 ～ 240
HMAT010-20H 5 ～ 120
HMTA020-20H 5 ～ 60
HMTA010-30H 160 ～ 200
HMTA010-30H 300 ～ 480 42
HMTA020-30H 80 ～ 200
HMTA040-30H 5 ～ 50
HMTA010-35H 600 ～ 1200 58
HMTA020-35H 300 ～ 480
HMTA040-35H 60 ～ 200
HMTR075-35H 5 ～ 50
HMTA020-45H 600 ～ 1200 66
HMTA040-45H 300 ～ 480
HMTR075-45H 60 ～ 200
HMTR150-45H 5 ～ 80
HMTR220-45H 5 ～ 60
HMTA040-55H 600 ～ 1200 82
HMTR075-55H 300 ～ 480
HMTR150-55H 100 ～ 200
HMTR220-55H 80 ～ 120
HMTR370-55H 5 ～ 60
HMTR550-55H 5 ～ 40

Croise Motor

Model No. Reduction ratio Q
CSMA010-130H 10 ～ 60 20
CSMA020-130H 10 ～ 60
HCMA010-16*H 40 ～ 200 25
HCMA020-16*H 40 ～ 75
CSMA040-160H 10 ～ 30
CSMA055-160H 10 ～ 30
HCMA010-22*H 240 ～ 300 30
HCMA020-22*H 90 ～ 200
HCMA040-22*H 40 ～ 75
HCMA055-22*H 40 ～ 50
CSMA040-220H 40 ～ 60
CSMA055-220H 40 ～ 60
CSMR075-220H 10 ～ 30
HCMA020-28*H 240 ～ 300 40
HCMA040-28*H 90 ～ 200
HCMA055-28*H 60 ～ 150
HCMR075-28*H 40 ～ 75
CSMR075-280H 40 ～ 60
CSMR150-280H 10 ～ 30
HCMA040-32*H 240 ～ 300 50
HCMA055-32*H 180 ～ 200
HCMR075-32*H 90 ～ 150
HCMR150-32*H 40 ～ 50
CSMR150-32*H 40 ～ 60
CSMR220-32*H 10 ～ 40
HCMA055-40*H 240 ～ 300 55
HCMR075-40*H 180 ～ 200
HCMR150-40*H 60 ～ 120
HCMR220-40*H 40 ～ 75
CSMR220-40*H 50 ～ 60
CSMR370-40*H 10 ～ 30
HCMR075-50*H 240 ～ 300 70
HCMR150-50*H 150 ～ 300
HCMR220-50*H 90 ～ 300
CSMR370-50*H 40 ～ 60