Scientists develop battery-free and wire-foldable robots

According to foreign media reports, folding robots inspired by Japanese traditional origami art can enter environments that cannot be reached by traditional robots and accomplish tasks that conventional robots cannot achieve. However, these devices have a huge drawback: they must be equipped with batteries or wires. Today, researchers at Harvard University have found a solution to this problem. Their collapsible robots can use wireless magnetic fields for control. Collapsible robots are a stylish, on-demand robot. The user can fold it up and send it into an environment where other shapes cannot enter, and then let the robot restore its shape and perform tasks.

The problem is that the most complex origami robots today require batteries and wires, so they are heavy and clumsy and are not safe from a biological point of view.

True, the most exciting aspect of collapsible robots is their great potential in the medical awards. Future doctors can send miniature origami robots into the patient's body and deploy them before performing treatment tasks, such as sending drugs to designated body parts. Wires and batteries obviously can cause interference. So scientists at the Weiss Institute for Biological Engineering and the John A. Paulson School of Engineering and Applied Science at Harvard University decided to develop an externally powered wireless collapsible robot.

Previously, scientists have developed foldable robots that do not require batteries or wires, but their design is too simple. In contrast, the shape and function of the new foldable robot are more complicated.

Under the leadership of robot scientist Mustafa Boyvat, the researchers designed and tested several different systems, including a quadrilateral robot that can be folded into a quarter size and a A palm-sized ship robot made of paper.

In order to allow these robots to operate without batteries, the researchers installed two components at their joints: one is a coil made of shape memory alloy that allows the robot to return to its original shape when heated, and the second is at a specific magnetic resonance frequency. A small circuit that produces electricity.

By changing the frequency of the magnetic field, the robot can fold one joint according to the needs without interfering with each other. If the magnetic field is superimposed, multiple joints can be folded at the same time. The research team demonstrated a variety of degrees of freedom, which can be achieved in centimeters and millimeters.

"Like origami, our design is very simple." The co-author Je-sung Koh points out, "The system only needs to install basic passive electronic components on the robot to generate electricity, and the rest of the problems are left to the robot itself. ."

Researchers can move and unfold these devices without touching them, even if they are invisible.

"We believe that this study reflects the feasibility of wirelessly powered, wirelessly controlled origami robots," the authors of the study pointed out. "This technology can be used to develop a collapsible medical device that does not require power storage or control components for remote patient use." operation."

In addition, the researchers are still contemplating a robot that can be swallowed into the body to replace the endoscope. The device can shuttle within the body and perform simple tasks such as grabbing tissue or taking video. The most exciting thing is that the size of the device can be changed at will.

“The research on miniaturization can continue to go deeper,” Boywate pointed out. “I think we have not yet reached the lower limit of the robot's volume. We are more excited to further study our design and use it in the medical field.”

Next, the researchers plan to experiment with robots of different sizes and configurations and test their performance at different frequency bands. But to see more complex and sophisticated origami robots, I do not know how long to wait.

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