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This Tiny Robotic Clutch Could Give Future Robots Human-Like Strength and Gentle Touch

Robots are becoming more advanced every year, but one major challenge remains: creating machines that are both powerful and gentle. A robot needs enough strength to lift heavy objects, but it also needs the ability to handle delicate things without damaging them. Humans can easily switch between these two abilities with their hands, but robots have struggled to achieve the same balance.

Traditional robotic systems usually use motors combined with gears to increase force. Gears help robots become stronger, but they also make them stiff and less flexible. A robot with heavy gearing cannot easily respond to outside forces, making it harder to safely interact with humans or delicate objects.

Now, researchers led by Aksoy and their team have developed a new robotic technology that could solve this problem. Their system uses electroadhesive clutches and a smart power-sharing design to create robotic movements that can be both strong and flexible. This breakthrough could help build smaller, more efficient robotic hands with abilities closer to the human hand.

The Problem With Current Robotic Systems

A good robotic hand needs two important features: high force output and backdrivability.

High force output means the robot can produce enough power to hold or lift heavy objects.

Backdrivability means the robot can move naturally when an external force is applied. For example, if a person pushes a robotic arm, a highly backdrivable robot can respond smoothly instead of resisting like a rigid machine.

Most robots struggle because improving one ability usually reduces the other. Strong geared motors create high force but make robots stiff. Softer systems allow better movement but cannot produce enough strength.

The new research focuses on creating a system that can provide both.

A New Approach Using Electroadhesive Clutches

The key technology behind this research is an electroadhesive (EA) clutch.

An electroadhesive clutch works by using electricity to create a strong attraction between surfaces. When voltage is applied, the surfaces grip together and transfer force. When the voltage is removed, the grip disappears, allowing free movement.

These clutches are lightweight and thin, making them attractive for compact robots. However, one problem is that traditional electroadhesive systems cannot generate enough force for demanding robotic tasks.

The researchers solved this by combining electroadhesion with a mechanical principle called the capstan effect.

Using the Capstan Effect to Multiply Force

The capstan effect is a simple but powerful idea. When a rope is wrapped around a curved surface, a small force can control a much larger force. This principle has been used for centuries in sailing and mechanical systems.

The researchers applied the same idea to robotic clutches.

They wrapped thin electroadhesive materials around cylindrical surfaces. The curved shape greatly increased the gripping ability of the clutch, allowing it to transmit much larger forces without needing larger motors.

This design allows a small robotic component to achieve high strength while remaining lightweight and compact.

A Tiny Device With a Huge Range of Force

One of the most impressive features of this technology is its wide force range.

The thin-film electroadhesive clutches are only about 60 micrometers thick, yet they can transmit forces above 100 newtons.

At the same time, the system can also work at extremely low force levels. By controlling the voltage using a method called pulse-width modulation (PWM), researchers can adjust the force very precisely.

This means the same robotic system can:

  • Hold a heavy object firmly

  • Adjust its grip gently

  • Interact safely with humans

  • Perform delicate tasks requiring careful control

This ability is important for future robots working in homes, hospitals, and industries.

Separating Movement From Holding

Another major innovation is the way the system manages power.

In traditional robots, the motor often has to keep working continuously to maintain a grip. Even when the robot is holding an object and not moving, the motor consumes energy.

The new system separates the process into two parts:

  1. Creating movement

  2. Maintaining the grip

The researchers designed a load-transfer mechanism where one part transfers power from the motor, while another part locks the position mechanically.

Once the robot grabs an object, the system can hold it without constantly using motor power.

This makes the robot much more energy efficient.

A Robotic Hand That Can Change Between Soft and Strong

To test their idea, the researchers created a two-finger robotic gripper.

The gripper could operate in two different modes.

In the first mode, it became soft and easily movable. This allowed humans to interact with it safely. The fingers could move naturally instead of fighting against external forces.

In the second mode, the gripper became strong and locked into position. It could hold objects firmly without wasting energy.

This ability to switch between flexibility and strength is similar to how human muscles work. Our muscles can relax for gentle movements and become powerful when we need force.

Understanding How the System Works

The researchers also studied the physics behind their design.

They created a model explaining how forces move through the curved clutch surfaces. Their experiments showed that the clutch operates through different stages.

Sometimes the surfaces stick together completely and transfer maximum force.

Other times, controlled slipping occurs, allowing smoother movement and reducing resistance.

This controlled slipping is actually useful because it helps the robot become more responsive and easier to move.

Using special strain imaging techniques, the team observed how the force moved through the clutch and confirmed that the system was working as expected.

Fast Response and Future Potential

The system can switch states very quickly. The researchers demonstrated millisecond-level switching and operation close to 1,000 changes per second.

Fast response is important because real-world robotic tasks require constant adjustment. A robot picking up a fragile object needs to quickly change its grip based on the situation.

This technology could eventually improve robotic hands, prosthetic devices, and collaborative robots that work alongside humans.

Challenges Ahead

Although the results are promising, there are still challenges.

The performance of the clutch depends on friction between surfaces. Changes in speed, surface condition, or environment could affect how much force the system produces.

The mechanical parts also add some weight and friction, which may reduce the sensitivity needed for very delicate tasks.

Another important improvement would be adding advanced sensors and feedback systems. These would allow robots to automatically measure the force they are applying and adjust it in real time.

A Step Toward More Human-Like Robots

This research shows a new way of designing robotic systems. Instead of depending only on powerful motors and heavy gears, future robots could use lightweight smart mechanisms that are stronger, more efficient, and more flexible.

Electroadhesive clutch technology could help create robotic hands that combine the best qualities of machines and humans: strength, precision, safety, and adaptability.

As researchers continue improving this technology, it may bring us closer to a future where robots can naturally interact with people and perform tasks that once seemed impossible for machines.

Reference: Aksoy, B., Shilati, A., Forbes, B. et al. Strong yet backdrivable robots through capstan-amplified electroadhesive clutches. npj Robot 4, 23 (2026). https://doi.org/10.1038/s44182-026-00084-1

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