Proven in the Field

Real-World Case Studies

See how ZHR actuators perform in demanding applications—from 7-DOF robot arm research platforms to surgical exoskeleton deployments. Real data, real results.

Case Study 01

7-DOF Desktop Robot Arm: ZHR-P Series Joint Motor Deployment

A lightweight, fully open-source 7-DOF desktop manipulator (6 arm joints + 1 end-effector gripper) powered by ZHR-P series integrated joint motors, enabling CAN communication, ROS2 control, and real-time kinematic solving.

7-DOF desktop robot arm with orange and black ZHR-P series joint motors performing manipulation task

The Challenge

The research team needed a lightweight desktop robot arm for ROS2 development and multi-arm coordinated control experiments. Key requirements included: low weight (<2kg per joint), high torque density, native CAN 2.0 communication at 1 Mbps, and compatibility with MoveIt2 motion planning stack. Traditional industrial actuators were too heavy and expensive for this research platform.

The Solution

The team selected a hybrid ZHR-P series configuration: Joints J1–J3 (base, shoulder, elbow) use ZHR-P14 actuators (±14 Nm peak torque, ±33 rad/s max speed), while J4–J7 (wrist + gripper) use ZHR-P05 actuators (±6 Nm peak torque, ±50 rad/s max speed). All joints feature integrated motor + planetary gearbox + driver + 14-bit dual encoders in a single compact housing. Communication via SocketCAN (CAN 2.0 Extended Frame, 1 Mbps).

Actuator Configuration & Performance Specs

Joint Actuator Model Peak Torque Max Speed Position Range Weight
J1 (Base) ZHR-P14 ±14 Nm ±33 rad/s ±160° 310g
J2 (Shoulder) ZHR-P14 ±14 Nm ±33 rad/s ±180° 310g
J3 (Elbow) ZHR-P14 ±14 Nm ±33 rad/s ±230° 310g
J4 (Wrist 1) ZHR-P05 ±6 Nm ±50 rad/s ±90° 280g
J5 (Wrist 2) ZHR-P05 ±6 Nm ±50 rad/s ±90° 280g
J6 (Wrist 3) ZHR-P05 ±5.5 Nm ±50 rad/s ±90° 280g
J7 (Gripper) ZHR-P05 ±5.5 Nm ±50 rad/s ±90° 280g

Results & Outcomes

100%
Pure Python SDK & ROS2 control stack compatibility—no proprietary middleware required
1 Mbps
Stable CAN 2.0 Extended Frame communication with real-time multi-arm coordination
7 DOF
Full kinematic redundancy enabling obstacle avoidance and singularity-free motion planning via MoveIt2
Key Achievement: The ZHR-P series actuators enabled a fully open-source 7-DOF desktop robot arm platform running on Ubuntu 22.04+, with PyQt6 visualization terminal, Pinocchio dynamics solving, and native ROS2 ecosystem integration. The lightweight design (total arm weight under 3kg) makes it ideal for research, education, and desktop automation control applications.
Case Study 02

Surgical Exoskeleton: ZHR-H Series in Operating Room Applications

A powered lower-limb assistive exoskeleton deployed in hospital operating rooms to reduce surgeon fatigue during prolonged standing surgeries, utilizing ZHR-H series harmonic actuators for precision joint support.

The Challenge

Surgeons routinely stand for long periods during complex procedures (vascular surgery, orthopedic operations, neurosurgery), leading to severe lower-limb fatigue, musculoskeletal disorders, and degraded surgical precision over time. Traditional solutions (anti-fatigue mats, periodic sitting) were insufficient for sterile operating room environments. The need: a wearable support device that reduces physical load without restricting range of motion or compromising sterile protocol.

The Solution

The exoskeleton integrates ZHR-H series harmonic actuators at the hip and knee joints, providing three operating modes: (1) Sitting-while-standing mode—the exoskeleton supports the surgeon's weight in a semi-seated posture; (2) Dynamic support mode—active assistance during leg movement transitions; (3) Static hold lock mode—rigid support for prolonged static standing. The harmonic reducer's <20 arcsec backlash ensures smooth, vibration-free support critical for surgical precision.

Exoskeleton Joint Actuator Specifications

Actuator Type
ZHR-H Series
Harmonic reducer integrated joint motor
Backlash
<20 arcsec
Zero-backlash for smooth support
Operating Modes
3 Modes
Sit-stand / Dynamic / Passive lock
Deployment
Hospital Partners
Partner clinical use cases

Clinical Results & Surgeon Feedback

Partner
Clinical use cases documented with partner feedback
Reported
Reduction in physical effort for interventional procedures (lead apron wearers)
Zero
Reported restrictions in range of motion or surgical precision

Clinical Robotics Partner Pilot (Vascular & Interventional Procedures): The active/semi-active exoskeleton joint module was validated in continuous 4-to-6 hour mock intervention and surgical laboratory environments. Ergonomic specialists and test engineers confirmed that the sub-20 arcsec harmonic drive completely eliminated dead-zone wobble, achieving "smooth torque transitions with zero motion lag during delicate micro-position adjustments."

Active Robotic Joint vs. Conventional Spring Counterbalances: Traditional passive mechanical supports rely on fixed spring rates that lack adaptive assistance across wide elevation angles. Integrating ZHR-H14 and ZHR-H17 harmonic joint actuators allowed programmable assist profiles, reducing operative shoulder trapezius electromyographic (EMG) load while maintaining full surgical dexterity.

Long-Term Durability & Thermal Stability: Verified through multi-axis endurance cycling, the integrated cross-roller bearings withstand dynamic radial and axial shock loads with minimal thermal rise (<28°C over ambient during continuous duty), ensuring strict compliance with operating room temperature standards and long-term joint alignment integrity.

Why ZHR-H Series for Medical Applications?

Zero-Backlash Precision

Harmonic reducer technology ensures <20 arcsec backlash, critical for smooth, vibration-free support that doesn't interfere with delicate surgical movements.

Compact & Lightweight

High torque density (Nm/kg) enables a wearable form factor that doesn't burden the surgeon—essential for long procedures.

Sterile-Compatible Design

Assistive exoskeleton architecture integrates clean isolated joint actuators outside the sterile field, maintaining full compatibility with OR protocols.

Ready to Deploy ZHR Actuators in Your Application?

Whether you're building a research robot arm or a medical exoskeleton, our engineering team provides hands-on support from initial design through field deployment.

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