Legged robots are a big step forward in the field of robotics. That is why, in 2025, the industrial robotics market is expected to generate US$169.75 million in revenue. These robots walk, run, climb, and jump as animals and humans do, except they have movable legs instead of wheels or tracks.
These robots can move about in areas that are hard for regular-wheeled robots to handle. Therefore, researchers have utilized legged robots for search and rescue, industrial tasks, and exploration. So, this article provides an in-depth look at legged robots, covering what they are, the various types, how they function, and some popular examples.
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An Overview of Legged Robots
Legged robots are made up of mechanical legs that support locomotion. These specialized robots replicate the natural gait of humans or animals, allowing them to have greater mobility and balance compared to wheeled robots that rely on a continuous rolling motion. They perform optimally on extremely smooth, irregular, or challenging terrain, e.g., stairs, boulder field, or forest ground.
These robots also use sensors, actuators, and control algorithms for stabilization and collision avoidance. So, these robots become more stable and adaptable with the advancements in mechanical engineering, computer vision, and artificial intelligence.
Different Types of Legged Robots
Generally, the number of legs a robot has determines its classification. Every setup has advantages and possible uses of its own. Below are the primary types:
- Pogo Stick Robots
Source: IEEE Spectrum
Pogo stick robots jump vertically, simulating the action of a pogo stick with a single leg. They will try to apply their stability, balance, and energy-saving hopping ability with controlled jumping in unstable conditions and on uneven terrain.
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- Biped Robots
Source: azorobotics
Similar to human beings, the robots have two legs. Human beings apply them to human spaces, like offices or residences, and they apply them in a manner that replicates human walking. Also, for the maintenance of equilibrium and mobility, biped robots require high-tech balancing and coordinating mechanisms.
- Tripodal Robots
Source: artstation
Tripodal robots have three legs that make them stable and easy to move around. They can maintain a static balance with only three legs while one leg moves. People commonly use these legged robots for exploration, research, and creative robotic applications that require simple yet efficient movement.
- Quadruped Robots
Source: researchgate
Like many animals, quadruped robots have four legs. Compared to bipeds, its form is more stable and capable of handling uneven terrain. Thus, missions of exploration, military environments, and outdoor environments tend to utilize them.
- Hexapod Robots
Source: frontiersin.org
Hexapods, with six legs, have even better balance and weight distribution. They excel in regions that demand superb reliability and can navigate harsh terrain, maintaining mobility even if one or both legs malfunction.
- Octopods and Multi-Legged Robots
Source: solarnavigator
This group includes robots with eight legs or more. They provide outstanding redundancy and balance, although they are less prevalent. Besides, these robots have potential uses in harsh environments or for specialized scientific investigations.
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How Does This Work?
Legged robots work based on the integration of various subsystems that interact with each other. Grasping how legged locomotion is achieved requires understanding the interaction of the subsystems.
- Structure and Actuators
The engineers made the structure using lightweight yet robust materials. Each leg features several joints, including hips, knees, and ankles. The motion-causing actuators that power these joints typically include electric motors, hydraulic systems, or pneumatic systems.
- Control Algorithms
In a legged robot, control algorithms are the brains that operate. The team coordinates all legs, plans each step, and interprets sensor data. Various algorithms handle different levels of movement complexity. For instance, a basic stroll could use pre-established patterns, while dynamic climbing might utilize machine learning and reactive planning.
- Sensors and Feedback Systems
For balance and environmental adaptation, legged robots use a variety of sensors. Cameras, pressure sensors, accelerometers, and gyroscopes to mention but a few. Additionally, the robot is also capable of real-time adjustment of posture, step height, and gait based on feedback from these sensors.
- Gait Generation
A robot’s gait is the sequence of movement a robot uses when it walks. Like the human form, legged robots must balance their body while lifting each leg in a specific sequence, as humans do. Robots will either utilize static or dynamic gaits, depending on the mission and robot design.
- Power Supply
Power supplies for legged robots can be as varied as fuel cells or tethered power, or internal batteries, depending on what use they are put to. Effective power management is also required due to the real-time computing and high-torque motors needed.
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Prime Examples of Legged Robots
Here are some examples of legged robots and real-world uses in a variety of industries. These instances are grouped into categories for convenience:
- Bipedal Robots Used for Humanoid Research
Bipedal robots mimic human gait and balance. Researchers study human-robot interaction and apply them in humanoid research. Their design makes them mobile indoors in cities and buildings, simulating human movement in the real world in a realistic manner.
- Quadruped Robots for Military or Industrial Use
Quadruped robots actively transport materials and monitor in both military and industrial contexts. Besides, their four-legged design allows them to move effectively across snow, gravel, or sloped surfaces. This design ensures stability on uneven terrain, resulting in less slippage or unbalanced movement.
- Legged Robots in Agriculture or Wildlife Monitoring
Legged robots navigate smoothly across forests and farmlands in agricultural and wildlife monitoring. They gather environmental data and monitor crop health to reduce disruption. Researchers observe animals discreetly to promote sustainable practices and conduct ecosystem studies in remote areas.
- Hexapod Robots in Space or Disaster Recovery
Due to its exceptional stability over uncertain terrain, hexapod robots are perfect for space and disaster recovery missions. Their six-legged design allows them to carry sensors or equipment. Besides, this feature ensures balance and operation in dangerous, unstable situations, enabling them to navigate mines or collapsed buildings.
- Entertainment and Education Robots
Courses and competitions often utilize entertainment and educational robots to show motion control and programming concepts. By engaging students and children in hands-on learning activities, they foster curiosity, creativity, and problem-solving skills while making robotics exciting, safe, and accessible.
Conclusion
An exciting emerging field of robotics is the integration of mechanical engineering, artificial intelligence, and biologically inspired design in legged robots. Uses of legged robots are in traversing challenging environments that are off-limits to traditional robots.
These robots, ranging from two-legged humanoids to multi-legged terrain crawlers, are increasingly becoming valuable across industries. Besides, legged robots will become more efficient, flexible, and widely used as technology evolves, transforming industries and everyday life.
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