ZHR-H20 Integrated Harmonic Joint Module
High-torque 50–170Nm peak joint module combining high-power frameless BLDC motor, sub-20 arcsec harmonic drive gearhead, dual absolute encoders, and FOC CANopen driver. Weighs 1.55 kg.
Direct Engineering Verdict (TL;DR)
The ZHR-H20 is an all-in-one harmonic joint actuator delivering 170.0 Nm Peak (20–64 Nm Rated) peak (20–64 Nm rated continuous) torque with <20 arcsec backlash in an ultra-compact 1.55 kg package. Engineered specifically for humanoid robot shoulders, elbows, and 6-axis collaborative robotic arms, it integrates a frameless BLDC motor, strain wave gearhead, dual 18-bit absolute encoders, and 48V FOC servo driver with an express prototype delivery of 3–5 business days (MOQ = 1 unit).
How does ZHR-H20 maintain <20 arcsec backlash precision under dynamic loads?
Verdict: Zero-backlash repeatability (<20 arcsec) is maintained across a 10,000-hour rated operating life via pre-loaded harmonic flexspline tooth meshing combined with dual 18-bit absolute encoder closed-loop control.
Unlike traditional planetary gearboxes that develop backlash degradation through contact wear, the ZHR-H20 incorporates precision high-tensile alloy strain-wave gearing. By placing an 18-bit absolute encoder directly on the output shaft alongside the motor rotor encoder, the integrated FOC drive performs real-time deformation compensation and thermal expansion calibration, completely neutralizing lost motion during rapid humanoid arm accelerations.
Thermal dissipation and continuous duty cycle limits under 48V DC
Verdict: Under a continuous 80% duty cycle at 25°C ambient temperature, coil temperature stabilizes at 68°C when mounted to an aluminum mounting flange (≥150 cm² surface area), well below the 105°C insulation safety limit.
The actuator supports up to 2.66x–3.0x peak torque overload capability (up to 170.0 Nm Peak vs 20–64 Nm Rated) for transient cycles up to 3.5 seconds. For continuous high-duty humanoid arm articulation, ensure adequate conduction coupling between the actuator rear housing and the structural robot frame. Integrated temperature sensors on both stator windings and driver MOSFETs provide over-temperature safety shutdown at 95°C.
ZHR-H20 Technical Parameter Matrix & Comparative Benchmark
| Engineering Parameter | ZHR-H20 Value | Conventional Discrete Setup | Industry Benchmark |
|---|---|---|---|
| Peak Output Torque | 170.0 Nm Peak (20–64 Nm Rated) | 70.0 Nm | 80.0 Nm |
| Rated Continuous Torque | 20–64 Nm | 22.0 Nm | 25.0 Nm |
| Total Module Mass | 1.55 kg | 1.95 kg (Combined) | 1.35 kg |
| Torque Density | 41.3 Nm/kg (rated) / up to 109.7 Nm/kg (peak) | 35.9 Nm/kg | 59.2 Nm/kg |
| Backlash Precision | < 20 arcsec | 60 - 90 arcsec | < 30 arcsec |
| Rated Operating Voltage | 48V DC (24V–54V) | 48V DC | 48V DC |
| Control & Bus Interface | CANopen / RS485 | Analog / Pulse | CANopen |
| Encoder System | Dual 18-Bit Absolute | Single Incremental | Dual Absolute |
Frequently Asked Questions (FAQ)
What is the backlash precision and rated operating life of ZHR-H20?
The ZHR-H20 achieves backlash strictly under 20 arcseconds across its 10,000-hour rated operating life through pre-loaded precision strain wave harmonic gearing.
What communication protocols does the ZHR-H20 integrated driver support?
The integrated FOC driver supports CANopen (CiA 402 profile) and RS485. Please verify your system fieldbus interface before design-in.
What is the sample lead time and MOQ for ZHR-H20 prototyping?
Standard prototyping MOQ is 1 unit with an express lead time of 3 to 5 business days for evaluation and CAD verification.
Download ZHR-H20 3D STEP Model & CAD Package
Integrate ZHR-H20 CAD model directly into your robotics assembly in SolidWorks or Fusion 360 to verify dimensional clearances.