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AW57HS Series — NEMA 23 Stepper Motor with Precision Planetary Gearbox & Brake
The AW57HS series pairs Apexwell's NEMA 23 (57mm), 1.8° hybrid stepper motor with an HPS60 precision planetary gearbox and an integrated holding brake in one assembly, combining ≤15 arcmin backlash with a locked shaft when power is removed. Motor holding torque scales from 0.55 N·m to 2.5 N·m across eight body lengths, gearbox output torque reaches up to 32 N·m, and each model is available in either 4-wire (bipolar) or 6-wire (center-tap) configuration. The gearbox platform is shared with the AW60HS precision gearbox & brake series.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wire Configuration | 4-wire (bipolar) or 6-wire (center-tap) |
| Gear Material | Metal |
| Backlash (no load) | ≤15 arcmin |
| Noise | ≤55 dB |
| Brake Type | Spring-applied holding brake |
| 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 |
Motor 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 |
HPS60 Precision Planetary Gearbox Specifications
| Parameter | 1-Stage | 2-Stage |
|---|---|---|
| Reduction Ratio | 3, 4, 5, 7, 10 | 16, 20, 25, 28, 35, 40, 50, 70, 100 |
| Gearbox Length (L1) | 57 mm | 73 mm |
| Rated Output Torque | 10–28 N·m | 10–32 N·m |
| Transmission Efficiency | 96% | 94% |
| Weight | 750 g | 960 g |
Momentary torque moment is rated at two times the rated allowable load across both stages. 15 reduction ratios are available in total (3 to 100:1).
Brake Specifications
| Parameter | Value |
|---|---|
| Static Friction Torque | 2.0 N·m |
| Rated Voltage | DC 24V ±10% |
| Rated Power | 11.5 W |
| Max Speed | 5,000 rpm |
| Weight (brake unit) | 0.4 kg |
The brake holds the motor shaft when de-energized and releases when 24VDC is applied, independent of the motor phase windings and the gearbox.
Wiring
Each AW57HS motor is available in either 4-wire (bipolar) or 6-wire (center-tap) configuration, so it can drop into either a bipolar or unipolar driver setup without a different motor SKU. The brake coil is wired and powered separately.
Typical Applications
With ≤15 arcmin backlash, gearbox torque up to 32 N·m, and a holding brake that locks the shaft on power loss, the AW57HS series fits vertical (Z-axis) industrial drives, robotic joints that must hold position accurately without drifting, precision CNC and index tables, and other applications where both positioning accuracy and fail-safe holding matter at industrial torque levels.
Why Choose the AW57HS Precision Gearbox & Brake Series
Combining a precision planetary gearbox with an integrated brake in one assembly saves the space and integration work of stacking a separate gearbox and brake unit, while still delivering ≤15 arcmin backlash and a shaft that locks whenever the motor is de-energized. Because the gearbox platform is shared with the AW60HS, a design can move between the two motor frames without changing gearbox dimensions or ratio options. For applications needing only the gearbox or only the brake, Apexwell's separate precision-gearbox and brake series on the same frame offer lower-cost alternatives. Custom shaft configurations and encoder feedback 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.
