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The NEMA 8 (20mm) external drive type hybrid ball screw stepper motor features a 2-phase 1.8° stepper motor with a ball screw assembly in external drive configuration — where the screw rotates and the nut moves linearly along the screw. This design allows for long stroke lengths (up to 90mm) and is ideal for applications with external guide rails. The ball screw mechanism delivers up to 90% efficiency with near-zero backlash, ensuring high positioning accuracy and long operational life. This compact linear actuator is a preferred choice for medical devices, laboratory automation, robotics, and 3D printers where space is limited but precision cannot be compromised.
Structure Type: External Drive — Screw rotates, nut moves linearly. Best for long stroke applications with external guide rails.
| 电机规格 Motor size | 相电压(V) Voltage/Phase | 相电流(A) Current/Phase | 相电阻(Ω) Resistance/Phase | 相电感(mH) Inductance/Phase | 电机线数 Number of lead wires | 转子惯量(g·cm²) Rotor inertia | 电机重量(g) Motor weight | 电机长度L(mm) Motor length |
| 20 | 2.5 | 0.5 | 5.1 | 1.5 | 4 | 2 | 50 | 30 |
| 20 | 6.3 | 0.5 | 12.5 | 11 | 4 | 3 | 80 | 42 |
