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AW20HS Series — NEMA 8 Hybrid Stepper Motor
The AW20HS series is Apexwell's smallest standard (open-loop) hybrid stepper motor platform, built on a NEMA 8 (20mm) frame across three body lengths. This is the base configuration — for applications needing encoder feedback and real-time position correction, see our AW20HS closed loop series, which shares the same motor winding specifications in an encoder-equipped package.
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 |
|---|---|---|---|---|---|---|---|
| AW20HS30-0504A | 30 mm | 0.5 A | 4.8 Ω | 1.3 mH | 0.011 N·m | 2.1 g·cm² | 0.05 kg |
| AW20HS38-0604A | 38 mm | 0.6 A | 6.5 Ω | 1.7 mH | 0.018 N·m | 3.0 g·cm² | 0.06 kg |
| AW20HS42-0504A | 42 mm | 0.5 A | 5.2 Ω | 1.8 mH | 0.020 N·m | 3.8 g·cm² | 0.09 kg |
Torque-speed characteristic curves (constant current driving, 24VDC) are available on request for each model, showing holding torque tapering from roughly 0.011–0.02 N·m at standstill down to a stable plateau by 100–150 RPM.
Typical Applications
The AW20HS's compact NEMA 8 footprint suits camera and lens focus mechanisms, small robotic grippers, medical instrument positioning, valve actuators, and other micro-precision designs where a NEMA 11 or larger stepper simply won't fit.
Why Choose the AW20HS Series
As one of the smallest stepper frame sizes Apexwell offers, the AW20HS gives designers precise open-loop positioning in a footprint that competes with small DC and BLDC motors on size. For applications where occasional step loss under load is a real risk, the same motor is available with built-in encoder feedback — see our article on why closed loop stepper motors are replacing traditional steppers for guidance on which configuration fits your load profile. 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.
