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| Toyota T-HR3 |
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The Toyota T-HR3 is a third-generation humanoid robot developed by Toyota Motor Corporation's Partner Robot Division. Unveiled on November 21, 2017, the T-HR3 is a teleoperated humanoid platform designed to explore technologies for safely managing physical interactions between robots and their environments. Standing 154 cm tall and weighing 75 kg, the robot features 32 torque-controlled degrees of freedom and a pair of dexterous ten-fingered hands. It is controlled remotely through a full-body teleoperation interface called the Master Maneuvering System (MMS), which maps the operator's movements to the robot in real time while relaying visual and force feedback.
Toyota designed the T-HR3 as a versatile research platform rather than a commercial product. The company envisions future applications in homes, medical facilities, construction sites, disaster-stricken areas, and outer space. Since its debut, the T-HR3 has undergone significant upgrades, including 5G wireless connectivity developed in partnership with NTT DOCOMO, and its underlying teleoperation technology was applied to the mascot robots used at the Tokyo 2020 Olympic and Paralympic Games.
Toyota's involvement in robotics stretches back to the 1970s, when the company began developing industrial robots for its automobile manufacturing operations. By the early 2000s, Toyota expanded its robotics ambitions beyond the factory floor, establishing the Partner Robot Division to pursue humanoid robots capable of coexisting with and assisting people in everyday life.
The Partner Robot program gained public attention at Expo 2005 in Aichi, Japan, where Toyota showcased a series of humanoid robots that played musical instruments, including trumpets, tubas, and drums. The trumpet-playing Partner Robot (Version 1 Walking Type), sometimes called "Harry," stood approximately 145 cm tall, weighed around 40 kg, and featured 31 degrees of freedom. Three units were built, and their performance demonstrated Toyota's capabilities in fine motor control, artificial lip articulation, and bipedal locomotion. These musical robots were designed to express the Japanese concept of "wa" (harmony) and represented an early vision of robots as friendly companions rather than mere industrial tools [1].
Multiple versions of the Partner Robot were produced, ranging from bipedal walkers to wheeled platforms. In 2009, Toyota demonstrated a running version that achieved speeds of up to 7 km/h, though walking and running were limited to flat surfaces [2].
The T-HR3 designation indicates it is the third generation of Toyota's humanoid robot line. While Toyota has not published extensive details about the first two generations (T-HR1 and T-HR2), these earlier platforms served as internal research prototypes that informed the development of key technologies later integrated into the T-HR3. The roughly decade-long gap between the Expo 2005 demonstrations and the T-HR3 reveal in 2017 reflected a period during which Toyota refined its approach to humanoid robotics, shifting from entertainment-focused showcases to more practical teleoperation and physical interaction research [3].
The T-HR3 was designed and developed by Toyota's Partner Robot Division under the leadership of Akifumi Tamaoki, who served as General Manager. The robot's design emphasizes safe physical interaction with humans and environments, using torque-controlled joints throughout its body rather than position-controlled actuators. This approach allows the robot to sense and regulate the forces it applies, making it inherently safer for contact with people and objects.
| Parameter | Value |
|---|---|
| Height | 1,540 mm (154 cm / 5 ft 0.6 in) |
| Weight | 75 kg (165 lb) |
| Total degrees of freedom | 32 axes |
| Fingers | 10 per hand (20 total) |
| Body parts | 29 |
| Control system | Master Maneuvering System |
| MMS dimensions | 850 mm (W) x 1,500 mm (D) x 1,450 mm (H) |
| MMS weight | 170 kg |
| MMS control axes | 16 |
| MMS accessories | Data glove, head-mounted display |
The fundamental building block of the T-HR3's actuation system is the Torque Servo Module, a compact unit combining a motor, a reduction gear, and a supersensitive torque sensor. These modules are installed at every joint on the robot's body. The torque sensors employ a chromium-nitrogen (Cr-N) alloy thin-film design that provides both high sensitivity and high rigidity, allowing the robot to measure and control contact forces with precision [4].
The Torque Servo Modules were developed in collaboration with two Japanese precision equipment manufacturers: Tamagawa Seiki Co., Ltd. and NIDEC COPAL ELECTRONICS CORP. By connecting these modules to each of the robot's 29 body parts, the system communicates the operator's movements directly to the T-HR3 while simultaneously transmitting force feedback back to the operator through the Master Maneuvering System's 16 control axes [5].
The Torque Servo Module architecture enables three fundamental capabilities:
| Capability | Description |
|---|---|
| Flexible Joint Control | Regulates the force of contact the robot makes with any individual or object in its environment, preventing excessive force application |
| Whole-Body Coordination and Balance Control | Maintains the robot's balance when it collides with or comes in contact with external objects, allowing it to recover from disturbances |
| Real Remote Maneuvering | Provides seamless, intuitive control over the robot while delivering haptic feedback to the operator |
Additionally, the T-HR3 incorporates Self-Interference Prevention Technology, which operates automatically to ensure the robot's own limbs do not collide with each other during complex movements, and that the robot and user do not disrupt each other's motions [5].
The Master Maneuvering System (MMS) is the teleoperation interface through which a human operator controls the T-HR3. Unlike simple joystick or button-based remote controls, the MMS captures the operator's full-body movements and maps them directly to the robot's corresponding joints. This approach enables intuitive, instinctive control without the need for specialized training.
The MMS consists of a seated cockpit weighing 170 kg, equipped with 16 control axes that correspond to the robot's major joint groups. The operator wears a data glove for finger control and a head-mounted display (HMD) that provides a live stereoscopic view from the robot's perspective. Master arms track the operator's arm and hand positions, providing full range of motion for the robot's upper body. A master foot interface allows the operator to walk in place while seated, instructing the robot to move forward, backward, or laterally [5].
The 16 sensors in the MMS track the operator's movements and transmit instructions wirelessly to the T-HR3, which replicates them in real time. Critically, the system is bidirectional: force feedback from the robot's torque sensors flows back to the operator, allowing the user to feel the forces the robot encounters. This haptic feedback loop gives the operator a sense of physical presence in the robot's environment, approaching the concept of "telexistence" [6].
When the operator performs walking motions from within the MMS, the robot translates those inputs into stable bipedal locomotion. The T-HR3's balance control algorithms compensate for the differences between the operator's seated walking gestures and the robot's actual bipedal gait, maintaining stability even on uneven contact. The design prioritizes intuitive operation, so the robot was built to follow the operator's instructions while independently maintaining its balance [7].
The T-HR3 was publicly unveiled on November 21, 2017, ahead of the International Robot Exhibition 2017 (IREX 2017) held at Tokyo Big Sight from November 29 through December 2, 2017. At the exhibition, Toyota demonstrated the robot's teleoperation capabilities, including synchronized full-body movement, object manipulation, and force-controlled interaction. Akifumi Tamaoki stated at the time: "The Partner Robot team members are committed to using the technology in T-HR3 to develop friendly and helpful robots that coexist with humans and assist them in their daily lives" [5].
In November 2018, Toyota partnered with NTT DOCOMO to demonstrate remote control of the T-HR3 over a 5G mobile network. The trial took place with the operator and robot separated by approximately 10 kilometers. Previously, the T-HR3 had only been controlled through direct wired connections, which limited its operational range.
The 5G trials confirmed that the robot could perform tasks requiring precise force transmission at levels comparable to wired connections. Demonstrated tasks included holding a ball with both hands, grasping and stacking blocks, and shaking hands with a person. The low latency and high bandwidth of 5G proved essential for maintaining the real-time force feedback loop that makes the MMS effective [8].
This milestone was significant because it transformed the T-HR3 from a tethered laboratory demonstration into a potentially deployable remote avatar. With wireless 5G connectivity, an operator could theoretically control the robot from a distant location, opening possibilities for remote assistance in hazardous environments or healthcare settings.
Toyota showcased an improved version of the T-HR3 at the 2019 International Robot Exhibition in Tokyo and subsequently at CES 2020 in Las Vegas. The updated robot featured several notable improvements:
| Improvement | Details |
|---|---|
| Master Hand controller | A new, lighter hand controller enabling more precise finger-level manipulation |
| Weight reduction | Lighter arms and legs on the MMS, making the system easier and less fatiguing to operate |
| Walking refinement | More natural and smoother bipedal walking patterns |
| Fine manipulation | Ability to perform delicate tasks such as picking up a coin |
| Faster finger movements | Achieved through the lighter, more responsive controlling device |
These upgrades reflected Toyota's ongoing refinement of both the robot platform and its teleoperation interface. The lighter MMS components reduced operator fatigue, while improved control algorithms allowed finer motor tasks that were not possible with the 2017 version [7].
Toyota, as a top-level sponsor of the Olympic Games, deployed multiple robot systems at the Tokyo 2020 Olympic and Paralympic Games (held in 2021 due to the COVID-19 pandemic). While the T-HR3 itself was not deployed as a standalone robot at the Games, its underlying teleoperation technology was directly applied to the development of the Miraitowa and Someity mascot robots.
The mascot robots, designed to resemble the official Tokyo 2020 mascots, used force feedback and AI recognition technology derived from the T-HR3 program. Software was developed to coordinate movements in real time and to absorb the physical differences between the human operator and the smaller mascot robot bodies. The system recognized the operator's eye movements via camera and incorporated them into the remote-control system, enabling the mascots to produce lifelike facial expressions and gestures [9].
The Miraitowa and Someity robots welcomed athletes and guests at Games venues, performing human-like movements such as shaking hands, waving, and displaying a variety of facial expressions. Remote users could experience force feedback while interacting through the mascot avatars, allowing them to feel as if they were physically present at the venue [10].
Toyota also deployed other robots at the Games, including the Human Support Robot (HSR) for spectator assistance and delivery support robots, demonstrating the breadth of the company's robotics portfolio.
While the T-HR3 was developed by Toyota's Partner Robot Division in Japan, the company's robotics ambitions extend through the Toyota Research Institute (TRI), established in November 2015 with a $1 billion investment over five years. TRI, headquartered in Los Altos, California, with additional offices in Cambridge, Massachusetts, focuses on artificial intelligence, automated driving, and robotics research [11].
TRI is led by CEO Dr. Gill Pratt, who previously managed the Robotics Challenge and Neuromorphic Computing programs at DARPA. Under Pratt's leadership, TRI pursues an "Intelligence Amplification" approach, where machine learning and AI technologies augment human capabilities rather than replacing them. This philosophy aligns with the T-HR3's design as a human-controlled avatar rather than a fully autonomous system [11].
TRI's robotics division focuses on household assistance, addressing the challenges of aging populations in Japan and other countries. Research areas include:
Notable TRI innovations include the Soft Bubble Gripper, a compliant manipulator that passively conforms to object shapes while actively sensing applied force and detecting slip conditions. TRI has also explored a "gantry robot" concept, where a ceiling-mounted robotic system descends from an overhead framework to perform household tasks such as loading dishwashers, wiping surfaces, and clearing clutter [12].
Alongside the T-HR3, Toyota's Partner Robot Division developed the Human Support Robot (HSR), a compact mobile manipulator designed to assist elderly and disabled individuals. The HSR features an 8-degree-of-freedom body with a cylindrical wheeled base, a folding arm, and multiple sensors including lidar, stereo cameras, and a force sensor. Operating on ROS (Robot Operating System), the HSR can pick objects from the floor, retrieve items from shelves, and be operated by voice command, tablet, or remote control. Since 2015, Toyota has offered the HSR to researchers worldwide as an open innovation platform [13].
The HSR and T-HR3 represent complementary approaches within Toyota's robotics strategy: the HSR focuses on semi-autonomous domestic assistance, while the T-HR3 explores full-body teleoperation and avatar-style remote presence.
The T-HR3 occupies a distinctive position in the landscape of teleoperated humanoid robots. Several other systems have pursued similar goals with different approaches.
| System | Developer | Key Feature | Teleoperation Type |
|---|---|---|---|
| Toyota T-HR3 | Toyota | Torque Servo Modules, full-body MMS | Full-body bilateral teleoperation with force feedback |
| TELESAR V | Keio University (Susumu Tachi) | Haptic glove with thermal and vibration feedback | Upper-body telexistence with fingertip tactile sensing |
| HRP Series | Kawada Industries / AIST | Government-funded general-purpose humanoid | Semi-autonomous with telecommand support |
| GITAI G1 | GITAI | Space-focused, compressed data transmission | Combined AI and teleoperation for space tasks |
| Atlas | Boston Dynamics | Advanced dynamic locomotion | Primarily autonomous; limited teleoperation |
The TELESAR series, developed by Professor Susumu Tachi at Keio University, pioneered the concept of "telexistence," transmitting tactile, vibration, and thermal sensations to the operator via haptic gloves. TELESAR V allows the operator to feel objects the robot handles, such as marbles being poured into a cup. The T-HR3 shares this emphasis on haptic feedback but extends it to whole-body bilateral control, including lower limbs and locomotion [14].
Japan's HRP (Humanoid Robotics Project) series, developed by Kawada Industries and AIST with government sponsorship, focused on general domestic helper robots with telecommand capabilities. The HRP robots influenced the broader Japanese humanoid robotics ecosystem within which the T-HR3 was developed [15].
GITAI, a Japanese startup focused on space robotics, combines AI with teleoperation to perform tasks on the International Space Station. GITAI compresses 360-degree camera data from 800 Mbps to an average of 2.5 Mbps while keeping latency to around 60 ms, addressing the bandwidth constraints of space communication. The T-HR3's 5G teleoperation work with NTT DOCOMO explored similar challenges of maintaining force feedback fidelity over wireless networks [16].
Toyota has identified several potential application domains for the T-HR3 and its descendant technologies:
Toyota frames the T-HR3 within its broader transformation from an automobile manufacturer into a "mobility company." The robot represents what Toyota calls "virtual movement," where an operator's body is virtually projected into a remote space through an avatar. Unlike virtual reality, which simulates environments digitally, the T-HR3 provides a physical body capable of interacting with the real world, bridging the gap between telepresence and physical action [6].
The T-HR3 is notable for several reasons within the history of humanoid robotics. First, it demonstrated that a major automotive manufacturer could produce a state-of-the-art humanoid platform by leveraging its expertise in precision manufacturing, sensor development, and systems integration. The Torque Servo Modules, with their Cr-N alloy thin-film torque sensors, reflect Toyota's industrial capabilities in materials science and precision engineering.
Second, the T-HR3's emphasis on bilateral teleoperation with full-body force feedback distinguished it from the trend toward fully autonomous humanoids pursued by companies like Boston Dynamics. While many humanoid robot programs aim to eliminate human control entirely, Toyota's approach positions the human operator as an essential component, using the robot as a tool to extend the operator's physical presence into remote environments.
Third, the successful 5G remote control demonstration with NTT DOCOMO in 2018 helped establish the practical viability of high-fidelity robot teleoperation over commercial wireless networks, a capability that could prove essential for scaling remote robot operations beyond laboratory settings.