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AW57HS Series — 57mm Stepper Motor with Precision Planetary Gearbox
The AW57HS series pairs Apexwell's NEMA 23 (57mm), 1.8° hybrid stepper motor with an HPS60 precision planetary gearbox, offering motor holding torque from 0.55 N·m to 2.5 N·m and rated output torque up to 32 N·m after reduction. With two available gear-train stages and reduction ratios from 3:1 to 100:1, backlash is held to ≤15 arcmin at no load, positioning this series above the AW42HS precision gearmotor for industrial-duty precision positioning. The HPS60 gearbox is shared with Apexwell's AW60HS precision series, so output torque and reduction ratios are identical across both motor platforms.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Lead Wires | 4 (bipolar) |
| Gear Material | Metal |
| Output Bearing | Ball bearings |
| Max Radial Load | ≤40 kgf |
| Max Shaft Axial Load | ≤23 kgf |
| Backlash (no load) | ≤15 arcmin |
| Noise | ≤55 dB |
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 |
HPS60 Precision Planetary Gearbox Specifications
| Parameter | 1-Stage | 2-Stage |
|---|---|---|
| Reduction Ratio | 3, 4, 5, 7, 10 | 16, 20, 25, 28, 30, 35, 40, 50, 70, 100 |
| Gearbox Length (L1) | 57 mm | 73 mm |
| Rated Output Torque | 10–28 N·m | 10–32 N·m |
| Transmission Efficiency | 96% | 94% |
| Weight | 750 g | 960 g |
Momentary torque moment is rated at two times the rated allowable load across both stages. 15 reduction ratios are available in total (3 to 100:1), with rated output torque up to 32 N·m at the mid-range 2-stage ratios.
Typical Applications
With backlash held to ≤15 arcmin and output torque up to 32 N·m, the AW57HS precision series fits industrial robotic joints, precision CNC and index tables, semiconductor and electronics production equipment, and other heavier positioning tasks where NEMA 23 offers more torque headroom than the AW42HS precision line but a full servo motor system isn't required.
Why Choose the AW57HS Precision Gearmotor
Backlash of ≤15 arcmin makes this series suitable for applications where positioning repeatability matters more than cost, even at industrial torque levels. Because the HPS60 gearbox platform is shared with the AW60HS precision series, a design can move between the two motor frames without changing gearbox dimensions or reduction ratio options — useful when torque or holding-torque requirements shift late in a project. Fifteen reduction ratios across two gear-train stages let torque and speed be tuned within a single mounting footprint, and noise is held to ≤55 dB. For applications where backlash tolerance is less critical, Apexwell's standard planetary gearmotor line on the same frame offers a lower-cost alternative. 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.
