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AW42HS Series — 42mm Stepper Motor with Precision Planetary Gearbox
The AW42HS series pairs Apexwell's NEMA 17 (42mm), 1.8° hybrid stepper motor with an HP42 precision planetary gearbox, offering motor holding torque from 0.10 N·m to 0.80 N·m and rated output torque up to 12 N·m after reduction. With two available gear-train stages, reduction ratios from 3:1 to 100:1, and a choice of square or round output flange, backlash is held to ≤15 arcmin at no load, positioning this series above the AW35HS precision gearmotor for higher-torque, precision-tolerance applications on the widely-used NEMA 17 footprint.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Lead Wires | 4 (bipolar) |
| Gear Material | Metal |
| Output Bearing | Ball bearings |
| Max Radial Load | ≤30 kgf |
| Max Shaft Axial Load | ≤10 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 |
|---|---|---|---|---|---|---|---|
| AW42HS20-0804A | 20 mm | 0.8 A | 3.8 Ω | 4.5 mH | 0.10 N·m | 24 g·cm² | 0.12 kg |
| AW42HS28-0604A | 28 mm | 0.6 A | 8.0 Ω | 10.0 mH | 0.12 N·m | 30 g·cm² | 0.15 kg |
| AW42HS34-1304A | 34 mm | 1.3 A | 2.0 Ω | 2.8 mH | 0.28 N·m | 34 g·cm² | 0.22 kg |
| AW42HS40-1704A | 40 mm | 1.7 A | 2.2 Ω | 3.8 mH | 0.35 N·m | 54 g·cm² | 0.28 kg |
| AW42HS48-1704A | 48 mm | 1.7 A | 3.1 Ω | 5.0 mH | 0.52 N·m | 68 g·cm² | 0.35 kg |
| AW42HS60-1704A | 60 mm | 2.5 A | 1.25 Ω | 3.3 mH | 0.80 N·m | 80 g·cm² | 0.48 kg |
HP42 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) | 35 mm (square) / 40 mm (round) | 46 mm (square) / 51 mm (round) |
| Rated Output Torque | 5–9 N·m | 5–12 N·m |
| Transmission Efficiency | 96% | 94% |
| Weight | 250 g | 360 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). Unlike the AW28HS/AW35HS precision lines, the AW42HS gearbox is offered with a choice of square or round output flange in the same reducer length.
Typical Applications
With backlash held to ≤15 arcmin and output torque up to 12 N·m on the widely-used NEMA 17 footprint, the AW42HS precision series fits robotic arm joints, semiconductor and electronics handling equipment, precision CNC and inspection stages, and other positioning tasks where NEMA 17 is the preferred frame size but standard-tolerance planetary gearing isn't accurate enough.
Why Choose the AW42HS Precision Gearmotor
Backlash of ≤15 arcmin makes this series suitable for applications where positioning repeatability matters more than cost. NEMA 17 is the most widely supported stepper frame size in the motion-control ecosystem, and the square/round flange choice on the same gearbox length lets one motor selection drop into more mounting layouts without a redesign. 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 use in lab and clean-room environments. 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.
