Previous
Next
AW28HS Series — NEMA 11 Hybrid Stepper Motor
The AW28HS series is Apexwell's NEMA 11 (28mm) hybrid stepper motor line, offered 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 between our NEMA 8 (AW20HS) and NEMA 14 (AW35HS) platforms for applications that have outgrown the smallest footprint but don't yet need NEMA 14 torque.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wires | 4 (bipolar) |
| 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 |
|---|---|---|---|---|---|---|---|
| AW28HS30-1004A | 30 mm | 1.0 A | 2.9 Ω | 1.9 mH | 0.07 N·m | 8.5 g·cm² | 0.09 kg |
| AW28HSA33-0804A | 33 mm | 0.8 A | 5.3 Ω | 3.3 mH | 0.08 N·m | 9.3 g·cm² | 0.10 kg |
| AW28HSA40-0704A | 40 mm | 0.7 A | 6.5 Ω | 6.0 mH | 0.12 N·m | 13.5 g·cm² | 0.12 kg |
| AW28HSA45-0804A | 45 mm | 0.8 A | 7.8 Ω | 5.4 mH | 0.13 N·m | 15.0 g·cm² | 0.15 kg |
| AW28HSA48-0804A | 48 mm | 0.8 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
The AW28HS's NEMA 11 footprint suits small camera gimbals, medical pump actuators, office automation equipment, and light robotics joints where NEMA 8 doesn't have enough torque but a larger frame adds unnecessary size and weight.
Why Choose the AW28HS Series
Six body lengths on one NEMA 11 mounting interface give fine-grained control over torque selection without changing the mechanical footprint. For applications where occasional step loss under load is a concern, see our article on why closed loop stepper motors are replacing traditional steppers to evaluate whether a closed loop configuration makes sense for your design. Custom shaft length and connector configurations 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.
