Worm and Multi-Spur Reduction Gear Unit
1 or 3 Phase Induction Motor Constant Speed
Enclosures: Standard Ventilated Internal Fan Cooled (IP 20)
Alternative Totally Enclosed (IP 50) with Terminal Box (IP 54) (SD 41 only)
Gearbox Type:
SWS
Speed Range: 1 71 r.p.m.
FINAL
R.P.M.
OUTPUT TORQUE (Nm)
WORM
RATIO
SPUR
SD 21 SWS
SD 41 SWS
Voltage, Construction, Connections, Motor Performance
Specifications and Optional Extras
see pages 6 and 8 for full details.
(1 Nm = 8.85 lbs. ins.) (1 Nm = 10.2 cmkp)
Gearbox
Specification
Motor Speed
1400 r.p.m.
1 Phase
Motor Rating
8 watts
1 or 3 Phase
Motor Rating
10 watts
SD 21 SWS SD 41 SWS
1
2
3.6
4.8
6.4
9.5
11.7
15.7
23
28.3
35.4
44:1
22
1
/
2
:1
12
1
/
2
:1
9
1
/
3
:1
9
1
/
3
:1
6
1
/
4
:1
12
1
/
2
:1
9
1
/
3
:1
6
1
/
4
:1
5
1
/
6
:1
4
1
/
8
:1
31.3
31.3
31.3
31.3
23.5
23.5
9.6
9.6
9.6
9.6
9.6
11
11
11
10
8
6
4.2
3.4
2.6
2.3
1.9
11
11
11
11
10
7
5
4
3
2.7
2.2
FINAL
R.P.M.
OUTPUT TORQUE (Nm)
WORM
RATIO
SPUR
Gearbox
Specification
Motor Speed
2800 r.p.m.
1 Phase
Motor Rating
20 watts
1 or 3 Phase
Motor Rating
25 watts
SD 21 SWS SD 41 SWS
2
4
7.2
9.6
13
19
23.3
31.4
47
56.5
71
44:1
22
1
/
2
:1
12
1
/
2
:1
9
1
/
3
:1
9
1
/
3
:1
6
1
/
3
:1
12
1
/
2
:1
9
1
/
3
:1
6
1
/
4
:1
5
1
/
6
:1
4
1
/
8
:1
31.3
31.3
31.3
31.3
23.5
23.5
9.6
9.6
9.6
9.6
9.6
11
11
11
11
10
7
5
4
3
2.7
2.2
11
11
11
11
11
9
6
5
3.7
3.3
2.7
38
SD 21 SWS = 191
SD 41 SWS = 204
Ø 81
25.4
Ø 29
Ø 26
32
33.5
6.6
13
42
11
47
11
30
68
43.2
36.8
80
80
92
73
SD 21 SWS
SD 41 SWS
Dimensions in mm. Scale 1:4
NB: Unit drawn is SD 41 SWS
Optional shaft at motor speed (lead end only) 7.93mm dia.
33mm long.
Approx. weight: SD 21 SWS 2.39 Kg
SD 41 SWS 2.95 Kg
4 holes tapped
M5
10mm deep.
10mm dia. h6. with 6mm flat
25.4 long.
Available both sides.
Optional terminal box tapped 20mm conduit or PG 13.5
on request. Standard entry position R.H.S.
(Not available on SD 21).
Leads out here 30cm
Motor C
L