Robots without batteries, motors or electronics can lack power, but a tiny gearbox driven by an external magnetic field enabled one soft robot to jump almost 40 times its height
or motors on board. The technology could lead to medical robots that can travel through the human body, taking samples or delivering drugs.
Soft robots – which have no batteries, motors or electronics and are powered and controlled remotely by light or magnets – are a popular field of research because their simplicity enables them to be highly miniaturised. But they may be lacking in power when the task requires puncturing skin or opening collapsed cavities.
“In the future we may use the robot in confined spaces, like the human body, or in granular media [such as sand] like [how] an earthworm [moves],” he says. “Compared to other magnetic robots, ours just requires a very small magnetic field, so we can put our control system far away from the robot, because the gearbox amplifies the magnetic force to function. So maybe this robot can obtain a larger working distance [than existing soft robots].”
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