Open-Loop Stepper Motors
Open-loop stepper motors are the industry standard for reliable, cost-effective motion control. These 2-phase hybrid stepper motors operate without feedback, making them simple to integrate and highly reliable for applications where missed steps are not critical. Adampower offers a complete range from ultra-compact NEMA8 to high-torque NEMA34, with holding torque spanning from 0.014 N·m to over 12 N·m.
Each motor in this series is built with precision-wound copper coils, high-grade magnetic steel rotors, and robust bearings to ensure long service life and consistent performance. The open-loop design eliminates the need for encoder feedback wiring, reducing system complexity and cost while maintaining excellent positional accuracy for the vast majority of positioning and speed control applications.
Available Models
| Model | Frame Size | Holding Torque Range | Motor Length | Typical Application |
|---|---|---|---|---|
| NEMA8 (HS8) | 20mm × 20mm | 0.014 - 0.030 N·m | 28 - 40mm | Compact instruments, micro stages |
| NEMA11 (HS11) | 28mm × 28mm | 0.045 - 0.120 N·m | 28 - 50mm | Small actuators, lab equipment |
| NEMA14 (HS14) | 35mm × 35mm | 0.065 - 0.220 N·m | 20 - 33mm | 3D printers, small robotics |
| NEMA16 (HS16) | 39mm × 39mm | 0.065 - 0.800 N·m | 20 - 44mm | Medical devices, office automation |
| NEMA17 (HS17) | 42mm × 42mm | 0.160 - 0.500 N·m | 33 - 48mm | 3D printers, CNC, robotics |
| NEMA23 (HS23) | 57mm × 57mm | 0.400 - 3.000 N·m | 41 - 112mm | CNC routers, industrial automation |
| NEMA24 (HS24) | 60mm × 60mm | 0.500 - 2.600 N·m | 45 - 90mm | Packaging machinery, textile equipment |
| NEMA34 (HS34) | 86mm × 86mm | 1.200 - 12.000 N·m | 66 - 150mm | Heavy machinery, large CNC |
Common Specifications
| Parameter | Value |
|---|---|
| Motor Type | 2-Phase Hybrid Stepper |
| Step Angle | 1.8° ±5% (200 steps/rev) |
| Step Accuracy | ±5% |
| Insulation Class | B (130°C) |
| Temperature Rise | 80°C Max |
| Ambient Temperature | -20°C to +50°C |
| Insulation Resistance | 100MΩ Min. (500V DC) |
| Dielectric Strength | 500V AC for 1 minute |
| Radial Play | 0.02mm Max (450g load) |
| End Play | 0.08mm Max (450g load) |
| Shaft Options | Single, Double (custom available) |
Why Choose Open-Loop?
- Cost-Effective: No encoder, fewer components, lower price
- Simple Integration: Standard 4-lead or 6-lead wiring, compatible with all major drivers
- Reliable: Proven technology with decades of industrial use
- Wide Range: 8 frame sizes, dozens of torque/length combinations
- Customizable: Shaft configurations, lead wire options, and special windings available
Related Documentation
Last updated: 2026-05-28