CHINA MS TECHNOLOGY CO., LTD. (MS MOTOR CO.,LTD.)
28JMCS20K/28STH

28mm Planetary Gearbox.Permissible Load Range: 0.6N.m~2.0N.m

Planetary Gearbox

Bearing at output

  Ball bearings

Sleeve bearings

Max. Radial load10mm from flange

50N

40N

Max. shaft axial load

30N

30N

Radial play of shaft near to flange

≤0.08 mm

≤0. 1mm

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

Single Shaft

A

Ω

mH

N.m

N.m

#

g-cm2

kg

mm

FL28STH32-0674A

0.67

5.6

3.4

0.060

0.005

4

9

0.11

32 max

FL28STH32-0956A

0.95

2.8

1.0

0.043

0.005

6

9

0.11

32 max

A–Single Shaft, B– Double shaft.

Planetary Gearbox Specifications

Reduction ratio

3.71

5.18

14

19

27

51

71

100

139

Number of gear trains

1

2

3

Length(L2)         mm

22.6

29.2

35.6

Max. rated torque

N.m

0.4

1.0

2.0

Short time permissible torque

N.m

1.2

3.0

6.0

Efficiency                         %

90%

81%

73%

Backlash at no-load

0.5°

1.0°

1.5°

Weight                              g

68

93

120

28STH Pull Out Torque Curve

image.png

Dimensions

image.png

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