Description
Key Technical Specifications
- Product Model: HDM-185-2000-8
- Manufacturer: Harmonic Drive
- System Platform: Harmonic Drive Component Set
- Gear Type: Strain wave gearing (harmonic drive)
- Reduction Ratio: 1:100
- Rated Torque: 200 Nm
- Maximum Torque: 600 Nm (peak)
- Repeated Peak Torque: 400 Nm
- Maximum Input Speed: 2000 RPM (continuous), 3500 RPM (intermittent)
- Backlash: Less than 1 arc-min (zero backlash design)
- Torsional Stiffness: 1.8 × 10⁵ Nm/rad
- Hollow Shaft Diameter: 50 mm (through bore for cable routing)
- Moment of Inertia: 0.85 kg·cm² (input side)
- Efficiency: Approximately 75% at rated load
- Operating Temperature Range: -10°C to +40°C
- Allowable Radial Load: 5000 N
- Allowable Axial Load: 2500 N
- Weight: 4.2 kg
- Lubrication: Grease (Harmonic Drive SK-1A or equivalent)
- Certifications: RoHS compliant, CE marked, ISO 9409-1 mounting standard
- Lifetime: Greater than 20,000 hours under rated conditions
Technical Architecture & Functional Positioning
The HDM-185-2000-8 functions as a precision reducer in the motion control layer of high-accuracy positioning systems, typically mounted between a servo motor and the driven element such as a robotic joint or rotary table. Its strain wave principle—comprising a circular spline, flexspline, and wave generator—deforms the flexspline elastically to achieve gear reduction, eliminating mechanical backlash and providing exceptionally smooth transmission. This architecture positions it ideally for applications where positional repeatability within arc-seconds is mandatory.
Key technologies include the high-strength alloy flexspline and precision-machined wave generator bearings, which distribute load across multiple teeth simultaneously (up to 30% engagement), yielding superior torque density and stiffness compared to planetary or cycloidal gears. The large hollow shaft facilitates routing of cables, pneumatics, or optics directly through the gear center, simplifying end-effector design in articulated robots. Thermal management is enhanced through grease lubrication optimized for low friction, minimizing heat generation during prolonged high-precision cycles.
Engineering value manifests in solving challenges associated with traditional gearing: backlash-induced positioning errors are virtually eliminated, critical for closed-loop control stability in semiconductor wafer handling or surgical robotics. High torsional stiffness resists deflection under load, maintaining trajectory accuracy during acceleration phases. In environments requiring compact, lightweight solutions, the component-set format allows custom housing integration, reducing overall system mass while supporting high reduction ratios in a single stage—avoiding the cumulative errors of multi-stage gearboxes.
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