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AW57HS Series — NEMA 23 Stepper Motor with Hollow Shaft
The AW57HS series is Apexwell's NEMA 23 (57mm) 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 eight body lengths from 41mm to 112mm, holding torque scales from 0.55 N·m to 2.5 N·m, and each model is available in either 4-wire (bipolar) or 6-wire (center-tap) configuration, making this Apexwell's highest-torque hollow-shaft frame below the AW60HS and AW86HS lines.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wire Configuration | 4-wire (bipolar) or 6-wire (center-tap) |
| 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 |
|---|---|---|---|---|---|---|---|
| AW57HS41-2504A | 41 mm | 2.5 A | 1.10 Ω | 2.4 mH | 0.55 N·m | 174 g·cm² | 0.45 kg |
| AW57HS51-2004A | 51 mm | 2.0 A | 1.30 Ω | 4.0 mH | 0.80 N·m | 257 g·cm² | 0.64 kg |
| AW57HS56-3004A | 56 mm | 3.0 A | 1.10 Ω | 3.5 mH | 1.20 N·m | 300 g·cm² | 0.70 kg |
| AW57HS64-4004A | 64 mm | 4.0 A | 0.60 Ω | 1.7 mH | 1.40 N·m | 390 g·cm² | 0.85 kg |
| AW57HS76-3004A | 76 mm | 3.0 A | 0.50 Ω | 2.4 mH | 1.50 N·m | 514 g·cm² | 1.00 kg |
| AW57HS84-3004A | 84 mm | 3.0 A | 0.57 Ω | 2.8 mH | 1.50 N·m | 578 g·cm² | 1.15 kg |
| AW57HS100-4204A | 100 mm | 4.2 A | 0.75 Ω | 3.4 mH | 2.40 N·m | 758 g·cm² | 1.25 kg |
| AW57HS115-4204A | 112 mm | 4.2 A | 0.80 Ω | 3.8 mH | 2.50 N·m | 856 g·cm² | 1.40 kg |
Wiring
Like the AW42HS, the AW57HS is available in both 4-wire (bipolar) and 6-wire (center-tap) configurations on the same body lengths, so it can drop into either a bipolar or unipolar driver setup without a different motor SKU.
Typical Applications
With a through-bore hollow shaft and torque up to 2.5 N·m on a NEMA 23 footprint, the AW57HS series fits industrial rotary tables needing cable or slip-ring-free pass-through, robotic joint and turret drives, winding and coiling machinery, and cable-management-sensitive rotary equipment where a solid-shaft motor would force cabling around the outside of the housing.
Why Choose the AW57HS 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, especially at industrial torque levels where routing cable externally becomes harder to manage. The 4-wire/6-wire choice lets one motor selection match either driver type, and eight body lengths let a product line scale holding torque roughly 4.5x (0.55–2.5 N·m) on the same mounting footprint. Custom shaft bore diameter 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.
