CHINA MS TECHNOLOGY CO., LTD. (MS MOTOR CO.,LTD.)
28JMBS50K/28STH

28mm Planetary Gearbox.Permissible Load Range: 1.5N.m~5.0N.m

Planetary Gearbox

Bearing at output

 Ball bearings

Sleeve bearings

Max. Radial load10mm from flange

100N

100N

Max. shaft axial load

50N

50N

Radial play of shaft near to flange

≤0.08 mm

≤0.1 mm

Axial play of shaft

≤0.3 mm

≤0.3 mm

28STH Hybrid Stepping Motor Specifications

Model No.

Current  /Phase

Resistance

/Phase

lnductance

/Phase

Holding  Torque

Detent   Torque

# of

Leads

Rotor

lnertia

Weight

Length

L1

适配减速比

Max. Gear

Ratio

Single Shaft

A

Ω

mH

N.m

N.m


g-cm2

kg

mm


28STH45-0956A

0.95

3.4

1.2

0.075

0.006

6

12

0.14

45

≤1:189

28STH51-0956A

0.95

4.6

1.8

0.090

0.008

6

18

0.20

51

≤1:189

A–Single Shaft, B Double shaft.

Planetary Gearbox Specifications

Reduction ratio

3.71

5.18

14

19

27

51

71

100

139

189

264

369

Number of gear trains

1

2

3

4

Length(L2)         mm

26.9

33.8

40.7

47.6

Max. rated torque

N.m

1.5

2.5

4.0

5.0

Short time permissible torque

N.m

4.5

7.5

12

15

Efficiency                         %

90%

81%

73%

66%

  Backlash   at no-load

0.5°

1.0°

1.5°

1.5°

Weight                             g

75

97

119

141

28STH Pull Out Torque Curve

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Dimensions

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Sales emailsales@ms-motor.com; msmotor@126.com