Page 1
WASHDOWN
Stepper MOtOrS
IP65 Rated StePPeR
motoRS foR Wet and
duSty envIRonmentS
OMHW24-108 shown
OMHW SerieS
l NEMA 23, 24 and 34 Frame
Sizes Available
l Integral 3 m (10') Shielded
Cable with Cable Gland
l Sealed Laminations
l Front Shaft Seal
OMEGA® is pleased to announce the addition
of NEMA size 23, 24 and 34 stepper motors
with IP65 ratings for operation in severe
environmental conditions.
The OMHW series are dust proof and
resistant to low pressure water jets, and
are ideal for applications in wet factory
environments such as the food and beverage
industry or outdoor use. Key features include
a nickel plated brass cable gland, sealed
laminations, and front shaft contact seal.
All models have an internal corrosionresistant film coating as standard.
IP65 specifies a product that is dust tight
(no ingress of dust; complete protection
against contact) and protected against water
jets (water projected by a nozzle from any
direction shall have no harmful effects).
smaller than actual size.
OMHW23-601 shown
smaller than actual size.
OMHW23-598 shown
smaller than actual size.
DESIGN TIPS
l Series connect lead wires for best torque at low speeds.
l Center tap to end or parallel connect lead wires for best torque at higher speeds.
l Keep motor case temperature below 100°C. This can be achieved by lowering the motor current or limiting
the duty cycle.
l Allow sufficient time to accelerate load.
l Size motor with 100% safety factor for required torque @ speed.
l Do not disassemble motors. A significant reduction in motor performance will result.
l Do not disconnect motor from drive while in operation.
l Do not use holding torque/detent torque of motor as fail safe brake.
MOTION INSTALLATION TIPS
l Mount the motor securely against a surface with good thermal conductivity such as steel or aluminum.
l Properly align the motor with the load using a flexible coupling.
l Protect the motor shaft from excessive thrust, overhang and shock loads.
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OMHW23-598
OMHW23-754
82 (3.2)
MAXIMUM
3048 (121) ±10
2x 56.4 (2.2)
MAXIMUM
ELECTRICAL SPECIFICATIONS
MOTOR
CONNECTION
1=SERIES
2=PARALLEL
MODEL NO.
3=UNIPOLAR
1
OMHW23-598
2 2.1 4.24 0.5 1.4
3 120 3.0 3.00 1.0 1.4
1
OMHW23-601
2 3.0 4.24 0.7 1.7
3 191 3.3 3.00 1.1 1.7
1
OMHW23-753
2 4.9 1.41 3.5 12.8
3 117 7.0 1.00 7.0 12.8
1
OMHW23-754
2 5.8 1.41 4.15 15.2
3 184 8.3 1.00 8.3 15.2
OMHW24-108
2 94.5 (3.72) 354 4 1.8 3.6 4.0 1.0 2.1 4.91 1361 (3)
1
OMHW34-506
2 3.6 5.6 0.65 5.4
3 906 5.2 4.0 1.29 5.4
1
OMHW34-696
2 4.9 4.06 1.2 10.8
3 778 7.0 2.90 2.4 10.8
MOTOR
LENGTH
mm (inch)
59.5 (2.34)
81.5 (3.21)
55.5 (2.18)
82 (3.23)
127 (5.00)
116.5 (4.59)
MINIMUM
HOLDING
TORQUE
(oz-in) LEADS
158
269
153
227
1260
1062
STEP
ANGLE
(DEG) VOLTS AMPS OHMS mH
4.2 2.12 2.0 5.6
8 1.8
4.7 2.12 2.2 6.8
8 1.8
9.9 0.71 14.0 51.2
8 1.8
11.8 0.71 16.6 60.8
8 1.8
7.3 2.8 2.6 2.6
8 1.8
9.7 2.03 4.8 43.2
8 1.8
ROTOR
INERTIA
2
g- cm
(oz-in2)
1.42
2.51
1.20
2.51
14.94
14.94
MOTOR
WEIGHT
g (lbs)
599
(1.32)
998
(2.2)
549
(1.21)
998
(2.2)
3810
(8.4)
3810
(8.4)
MECHANICAL AND ENVIRONMENTAL SPECIFICATIONS
SIZE HW23 SIZE HW24 SIZE HW34
SHAFT RUN-OUT (inches)
RADIAL PLAY (inch/Lbs) @ 1.1 lb
0.002 0.0012 0.002
0.0008 maximum
@ 1.1 lb
END PLAY (inch/lbs)
0.003 maximum
@ 2.2 lbs
OPERATING TEMPERATURE RANGE
INSULATION CLASS
LEAD WIRE GAUGE
MAXIMUM RADIAL LOAD (lbs)
MAXIMUM THRUST LOAD (lbs)
3048 (121) ±10
MAXIMUM
59.5
(2.3)
15 15 28
25 25 50
OMHW23-598
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.2
0
ø6.35 (0.3) -0.012
0.5 (0.02) x 45°
0.0008 maximum
@ 1.1 lb
0.003 maximum
@ 2.2 lbs
>-20 to 50°C (-4 to 122°F)
130°C (266°F) Class B
22 AWG
ø38.1 (1.5)
±0.05
4x ø5.7 (0.2)
0.001 maximum
@ 1.1 lb
0.003 maximum
@ 2.2 lbs
Dimensions: mm (inch)
+0.15
-0
2x 23.57
(0.9)
2x 47.14
(1.9) ±0.20
20 (0.8) ±0.5
5.8 (0.2) ±0.1
2x 56.4 (2.2)
MAXIMUM
2x 28.2
(1.1)
2
Page 3
OMHW23-754
OMHW23-598
OMHW23-506
OMHW23-754
3048 (121) ±10
59.5
(2.3)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.2
0
ø6.35 (0.3) -0.012
0.5 (0.02) x 45°
20 (0.8) ±0.5
ø38.1 (1.5)
±0.05
4x ø5.7 (0.2)
+0.15
-0
2x 23.57
(0.9)
2x 47.14
(1.9) ±0.20
2x 28.2
(1.1)
2x 56.4 (2.2)
MAXIMUM
3048
5.8 (0.2) ±0.1
82 (3.2)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
20.6 (0.8) ±0.5
0.5 (0.02) x 45°
3048 (121) ±10
2x 56.4 (2.2)
MAXIMUM
3048 (121) ±10
85 (3.35)
127 (5.0) ±1
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
25 (0.98)
±0.2 FLAT
37 (1.45)
±0.5
OMHW23-598
OMHW23-601
OMHW23-753
OMHW23-696
OMHW23-506
OMHW23-754
3048 (121) ±10
59.5
(2.3)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.2
0
ø6.35 (0.3) -0.012
0.5 (0.02) x 45°
20 (0.8) ±0.5
ø38.1 (1.5)
±0.05
4x ø5.7 (0.2)
+0.15
-0
2x 23.57
(0.9)
2x 47.14
(1.9) ±0.20
2x 28.2
(1.1)
2x 56.4 (2.2)
MAXIMUM
3048
(121) ±10
81.5 (3.2)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.2
0
ø6.35 (0.3) -0.012
0.5 (0.02) x 45°
20 (0.8) ±0.5
4x ø5.7 (0.2)
+0.15
-0
5.8 (0.2) ±0.1
ø38.1 (1.5)
±0.05
2x 23.57
(0.9)
2x 47.14
(1.9) ±0.20
2x 28.2
(1.1)
2x 56.4 (2.2)
MAXIMUM
5.8 (0.2) ±0.1
82 (3.2)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
ø38.1 (1.5)
±0.05
20.6 (0.8) ±0.5
0.5 (0.02) x 45°
3048 (121) ±10
2x 56.4 (2.2)
MAXIMUM
3048 (121) ±10
85 (3.35)
MAXIMUM
127 (5.0) ±1
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
25 (0.98)
±0.2 FLAT
37 (1.45)
±0.5
ø73.025 (2.87) ±0.025
3048 (121) ±10
86 ±0.5
(3.38 ±0.02)
116 ±1 (4.58 ±0.04)
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
22.2 ±0.25
(0.875 ±0.01)
0
3.175 -0.05
(0.125 +0.000)
-0.002
31.75 ±0.5
(1.25 ±0.02)
73.02 ±0.05
ø (2.875 ±0.002)
(0.555 -0.017)
MOTOR TO BE SHIPPED WITH
3.175 x 3.175 x 21.411
(0.125 x 0.125 x 0.843)
KEY TAPED TO SHAFT
OMHW24-108
94.5 ±1
(3.72 ±0.04)
8 ±0.3 (0.315 ±0.01)
1.5 ±0.2 (0.06 ±0.007)
+0
ø8 -0.012
24 ±0.5
(0.94 ±0.02)
4x ø 4.52 ±0.1
(0.177)
20 ±0.3 (0.78 ±0.01)
ø 38.1 ±0.05
(1.5 ±0.02)
FLAT 7.50 ±0.1 (0.29)
2x ø 47.14 ±0.35 (1.85)
OMHW24-108
4x ø 4.52 ±0.1
(0.177)
ø 38.1 ±0.05
(1.5 ±0.02)
FLAT 7.50 ±0.1 (0.29)
2x ø 47.14 ±0.35 (1.85)
(121) ±10
81.5 (3.2)
MAXIMUM
OMHW23-601
OMHW23-601
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.2
0
ø6.35 (0.3) -0.012
0.5 (0.02) x 45°
ø38.1 (1.5)
±0.05
4x ø5.7 (0.2)
+0.15
-0
2x 23.57
(0.9)
(1.9) ±0.20
2x 47.14
3048
(121) ±10
2x 56.4 (2.22)
2x 56.4 (2.2)
MAXIMUM
2 x 60 ±0.5
(2.36 ±0.02)
MAXIMUM
3048 (121) ±10
55.5 (2.2)
MAXIMUM
82 (3.2)
MAXIMUM
94.5 ±1
(3.72 ±0.04)
24 ±0.5
(0.94 ±0.02)
OMHW23-753
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
20.6 (0.8) ±0.5
OMHW23-754
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
20.6 (0.8) ±0.5
OMHW24-108
8 ±0.3 (0.315 ±0.01)
1.5 ±0.2 (0.06 ±0.007)
20 ±0.3 (0.78 ±0.01)
ø8 -0.012
20 (0.8) ±0.5
ø38.1 (1.5)
±0.05
0.5 (0.02) x 45°
ø38.1 (1.5)
0.5 (0.02) x 45°
ø 38.1 ±0.05
(1.5 ±0.02)
+0
FLAT 7.50 ±0.1 (0.29)
5.8 (0.2) ±0.1
2x 56.4 (2.2)
MAXIMUM
47.14 (1.85) ±0.2
±0.05
47.14 (1.85) ±0.2
2x 28.2
(1.1)
Dimensions: mm (inch)
4x ø5.7 (0.2)
47.14 (1.85) ±0.2
5.8 (0.2) ±0.1
4x ø5.7 (0.2)
47.14 (1.85) ±0.2
5.8 (0.2) ±0.1
2x ø 47.14 ±0.35 (1.85)
4x ø 4.52 ±0.1
+0.15
-0
+0.15
-0
(0.177)
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Page 4
OMHW23-754
82 (3.2)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
ø38.1 (1.5)
±0.05
20.6 (0.8) ±0.5
0.5 (0.02) x 45°
5.8 (0.2) ±0.1
47.14 (1.85) ±0.2
47.14 (1.85) ±0.2
4x ø5.7 (0.2)
+0.15
-0
2x 56.4 (2.2)
MAXIMUM
3048 (121) ±10
OMHW23-506
OMHW23-754
82 (3.2)
MAXIMUM
8.5 (0.3) ±0.3
1.6 (0.06) ±0.2
15 (0.6) ±0.25
+0.000
ø6.35 (0.3) -0.012
ø38.1 (1.5)
±0.05
20.6 (0.8) ±0.5
0.5 (0.02) x 45°
5.8 (0.2) ±0.1
47.14 (1.85) ±0.2
47.14 (1.85) ±0.2
4x ø5.7 (0.2)
+0.15
-0
2x 56.4 (2.2)
MAXIMUM
3048 (121) ±10
85 (3.35)
MAXIMUM
127 (5.0) ±1
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
25 (0.98)
±0.2 FLAT
37 (1.45)
±0.5
2x 69.6 (2.74) ±0.2
2x
34.80 (1.37)
11.5 (0.45)
±0.1 2 PLCS
ø73.025 (2.87) ±0.025
4x ø 6.5
(0.25) ±0.2
OMHW34-506
OMHW23-506
127 (5.0) ±1
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
ø73.025 (2.87) ±0.025
4x ø 6.5
(0.25) ±0.2
3048 (121) ±10
MAXIMUM
OPTIMAL DRIVE/MOTOR COMBINATIONS
(3.38 ±0.02)
85 (3.35)
86 ±0.5
116 ±1 (4.58 ±0.04)
OMHW34-696
OMHW23-696
37 (1.45)
10 ±0.3 (0.39 ±0.01)
2 ±0.2 (0.07 ±0.007)
+0.000
ø12.7 (0.5) -0.012
31.75 ±0.5
(1.25 ±0.02)
MOTOR TO BE SHIPPED WITH
3.175 x 3.175 x 21.411
(0.125 x 0.125 x 0.843)
KEY TAPED TO SHAFT
MODEL NO. OPTIMAL DRIVE
OMHW23-753
OMHW23-754
OMHW23-598
OMHW23-601
OMHW24-108
OMHW34-506
OMHW34-696
2035, 3540i, 3540M/MO, Si3540, STR2, ST5, STAC6
2035, 3540i, 3540M/MO, Si3540, STR2, ST5
STR8, ST5
STR8, ST5
STR8, ST5
STR8, ST10
STR8, ST5
To Order Visit omega.com/omhw_series for Pricing and Details
MODEL NO. DESCRIPTION
OMHW23-598
OMHW23-601
OMHW23-753
OMHW23-754
OMHW24-108
OMHW34-506
OMHW34-696
Ordering Example: OMHW23-598, NEMA 23 step motor with 158 oz-in minimum holding torque.
NEMA 23 step motor, 158 oz-in minimum holding torque, 4.24 A/phase (parallel)
NEMA 23 step motor, 269 oz-in minimum holding torque, 4.24 A/phase (parallel)
NEMA 23 step motor, 153 oz-in minimum holding torque, 1.41 A/phase (parallel)
NEMA 23 step motor, 227 oz-in minimum holding torque, 1.41 A/phase (parallel)
NEMA 24 step motor, 354 oz-in minimum holding torque, 4.0 A/phase (parallel)
NEMA 34 step motor, 1260 oz-in minimum holding torque, 5.6 A/phase (parallel)
NEMA 34 step motor, 1062 oz-in minimum holding torque, 4.06 A/phase (parallel)
25 (0.98)
±0.2 FLAT
±0.5
3.175 -0.05
(0.125 +0.000)
-0.002
22.2 ±0.25
(0.875 ±0.01)
Dimensions: mm (inch)
73.02 ±0.05
ø (2.875 ±0.002)
0
2x 69.6 (2.74) ±0.2
+0.00
14.1 -0.43
+0.00
(0.555 -0.017)
69.9 ±0.2
2x (2.74 ±0.007)
2x
34.80 (1.37)
4x ø 6.5
(0.25) THRU
34.80
2x (1.37)
11.5 (0.45)
±0.1 2 PLCS
4
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