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AW20HS Series — NEMA 8 Stepper Motor with Hollow Shaft
The AW20HS series is Apexwell's NEMA 8 (20mm) hybrid stepper motor line built around a through-bore hollow shaft (~Ø16mm), letting cables, optical fibers, pneumatic lines, or a pass-through mechanism run directly through the rotor axis instead of routing around the motor. Across three body lengths from 30mm to 42mm, holding torque scales from 0.011 N·m to 0.020 N·m, making this the smallest frame size in Apexwell's hollow-shaft stepper lineup.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wires | 4 (bipolar) |
| Hollow Shaft Bore | ~Ø16 mm |
| 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 |
Model Comparison
| Model | Body Length | Phase Current | Phase Resistance | Phase Inductance | Holding Torque | Rotor Inertia | Mass |
|---|---|---|---|---|---|---|---|
| AW20HS30-0504A | 30 mm | 0.50 A | 4.8 Ω | 1.3 mH | 0.011 N·m | 2.1 g·cm² | 0.05 kg |
| AW20HS38-0604A | 38 mm | 0.60 A | 6.5 Ω | 1.7 mH | 0.018 N·m | 3.0 g·cm² | 0.06 kg |
| AW20HS42-0504A | 42 mm | 0.50 A | 5.2 Ω | 1.8 mH | 0.020 N·m | 3.8 g·cm² | 0.09 kg |
Typical Applications
With a through-bore hollow shaft on a NEMA 8 footprint, the AW20HS series fits small rotary stages needing cable or fiber-optic pass-through, compact camera and gimbal joints, miniature slip-ring-free rotary connections, and light-duty winding or labeling equipment where routing cabling around the motor isn't practical in the available space.
Why Choose the AW20HS Series
A hollow shaft removes the need for a separate cable pass-through mechanism or slip ring — wiring, fiber, or a secondary shaft can run straight through the motor's rotational axis, simplifying the mechanical design around it. Three body lengths on the same NEMA 8 mounting footprint let a product line scale holding torque without changing the bore diameter or mounting interface. Custom shaft bore diameter and length 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.
