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AW57HS Series — NEMA 23 Stepper Motor with Eccentric Gearbox
The AW57HS series pairs Apexwell's NEMA 23 (57mm), 1.8° hybrid stepper motor with a 2GN-K eccentric gearbox, scaling motor holding torque from 0.55 N·m to 2.5 N·m across eight body lengths. With 22 available reduction ratios from 3:1 to 250:1 and up to 24.5 N·m of maximum permissible output torque, this series puts Apexwell's stepper motor platform on the same 2GN-K eccentric-gearbox interface used across our BLDC eccentric-gearmotor lines.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wire Configuration | 4-wire (bipolar) or 6-wire (center-tap) |
| Insulation Class | Class B (130°C) |
| Temperature Rise | 50K Max |
| Ambient Temperature | -20°C to +50°C |
| Insulation Resistance | ≥100 MΩ (500 VDC) |
| Dielectric Strength | 500 VAC, 1 minute |
| Gearbox Type | 2GN-K eccentric gearbox |
| Reduction Ratio Range | 3:1 to 250:1 |
Motor Model Comparison
| Model | Body Length | Phase Current | Phase Resistance | Phase Inductance | Holding Torque | Rotor Inertia | Mass |
|---|---|---|---|---|---|---|---|
| AW57HS41-2504A | 41 mm | 2.5 A | 1.10 Ω | 2.4 mH | 0.55 N·m | 174 g·cm² | 0.45 kg |
| AW57HS51-2004A | 51 mm | 2.0 A | 1.30 Ω | 4.0 mH | 0.80 N·m | 257 g·cm² | 0.64 kg |
| AW57HS56-3004A | 56 mm | 3.0 A | 1.10 Ω | 3.5 mH | 1.20 N·m | 300 g·cm² | 0.70 kg |
| AW57HS64-4004A | 64 mm | 4.0 A | 0.60 Ω | 1.7 mH | 1.40 N·m | 390 g·cm² | 0.85 kg |
| AW57HS76-3004A | 76 mm | 3.0 A | 0.50 Ω | 2.4 mH | 1.50 N·m | 514 g·cm² | 1.00 kg |
| AW57HS84-3004A | 84 mm | 3.0 A | 0.57 Ω | 2.8 mH | 1.50 N·m | 578 g·cm² | 1.15 kg |
| AW57HS100-4204A | 100 mm | 4.2 A | 0.75 Ω | 3.4 mH | 2.40 N·m | 758 g·cm² | 1.25 kg |
| AW57HS115-4204A | 112 mm | 4.2 A | 0.80 Ω | 3.8 mH | 2.50 N·m | 856 g·cm² | 1.40 kg |
Wiring
Each AW57HS motor is available in either 4-wire (bipolar) or 6-wire (center-tap) configuration, so it can drop into either a bipolar or unipolar driver setup without a different motor SKU.
2GN-K Eccentric Gearbox Specifications
| Reduction Ratio | 3–15 | 18–250 |
|---|---|---|
| Gearbox Length (L1) | 32 mm | 42 mm |
| Max Torque Moment | 1.2–5.4 N·m | 7–24.5 N·m |
22 reduction ratios are available (3, 3.6, 5, 7.5, 9, 10, 12.5, 15, 18, 20, 25, 30, 36, 50, 60, 75, 90, 100, 120, 150, 180, 250:1). Max torque moment plateaus at 24.5 N·m from ratio 60:1 upward.
Typical Applications
With 22 reduction ratios and gearbox torque up to 24.5 N·m on a NEMA 23 footprint, the AW57HS eccentric-gearmotor series fits conveyor indexing, packaging machinery, valve and damper actuation, and light-to-mid industrial positioning tasks where open-loop stepper control is sufficient and a wide, fine-grained ratio selection matters more than closed-loop feedback.
Why Choose the AW57HS Eccentric Gearmotor
The 22-ratio range on a single 2GN-K gearbox platform lets one motor selection be tuned across a wide speed/torque window without redesigning the mechanical interface, and the 4-wire/6-wire choice lets it match either driver type. Because the gearbox is factory-fitted and tested as a complete unit, output shaft alignment and gear mesh are verified before the motor ships. Custom shaft configurations and encoder feedback are available on request.
We can customize the electrical parameters of the motor and geometric dimensions such as the motor output shaft size according to customer requirements. Accessories including pulleys, eccentric gearboxes, planetary gearboxes and encoders can also be added. For more products and detailed specifications, please download the product catalog from the Download Center.
