Doctors have miniaturized almost everything they need to send robots inside your brain's blood vessels to treat damaged tissue. But making a motor small enough to squeeze past blood cells has held things up. Now, engineers at Monash University in Australia have built a micromotor that brings bitty 'bots closer to reality.Shrunken versions of standard electric motors, which use spinning magnets, have traditionally lacked power or required a bulky gear box to prevent them from spinning too fast. So the Monash engineers decided to power their 0.14-inch-tall motor, called Proteus, using reverse piezoelectricity — a phenomenon that converts an electric charge into motion — which lets it maintain power and run at a reasonable speed at any size. An electrified ceramic element oscillates up and down, twisting a springlike rod that turns a tiny ball. The ball's rotation could then spin a flagellum to help a robot swim.
Video courtesy MicroNanophysics Research Laboratory, Monash University, Melbourne Australia
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.