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AW28HS Series — NEMA 11 Stepper Motor with Hollow Shaft
The AW28HS series is Apexwell's NEMA 11 (28mm) hybrid stepper motor line built around a through-bore hollow shaft, letting cables, optical fibers, pneumatic lines, or a pass-through mechanism run directly through the rotor axis instead of routing around the motor. Across six body lengths from 30mm to 50mm, holding torque scales from 0.07 N·m to 0.13 N·m, positioning this frame size above the AW20HS hollow-shaft line for applications needing more torque on a still-compact bore-through motor.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wires | 4 (bipolar) |
| Shaft Type | Through-bore hollow shaft |
| 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 |
|---|---|---|---|---|---|---|---|
| AW28HS30-0604A | 30 mm | 0.60 A | 6.6 Ω | 4.9 mH | 0.07 N·m | 8.5 g·cm² | 0.09 kg |
| AW28HSA33-0804A | 33 mm | 0.80 A | 5.3 Ω | 3.3 mH | 0.08 N·m | 9.3 g·cm² | 0.10 kg |
| AW28HS40-0604A | 40 mm | 0.60 A | 9.7 Ω | 7.2 mH | 0.12 N·m | 13.5 g·cm² | 0.12 kg |
| AW28HSA45-0804A | 45 mm | 0.80 A | 7.8 Ω | 5.4 mH | 0.13 N·m | 15.0 g·cm² | 0.15 kg |
| AW28HSA48-0804A | 48 mm | 0.80 A | 8.6 Ω | 6.7 mH | 0.13 N·m | 17.2 g·cm² | 0.20 kg |
| AW28HS50-0674A | 50 mm | 0.67 A | 8.4 Ω | 5.6 mH | 0.12 N·m | 18.9 g·cm² | 0.21 kg |
Typical Applications
With a through-bore hollow shaft on a NEMA 11 footprint, the AW28HS series fits small rotary stages needing cable or fiber-optic pass-through, compact pan-tilt and gimbal joints, slip-ring-free rotary connections, and light-duty winding, dispensing, or labeling equipment where routing cabling around the motor isn't practical.
Why Choose the AW28HS 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. Six body lengths on the same NEMA 11 mounting footprint let a product line scale holding torque nearly 2x (0.07–0.13 N·m) 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.
