Abstract
We previously proposed a novel micro-actuator that provides propulsion using the mechanical resonance energy of a system excited by an electromagnetic force, allowing relatively high speeds. Long-distance movement proved difficult, however, because of the need for a power supply cable. In this paper, we propose a new cable-free actuator with a mechanical dc-ac micro-inverter that can move a long distance. The mechanical dc-ac inverter incorporates a double cantilever beam that switches under an electromagnetic force. The prototype actuator is capable of moving inside a very small pipe 10 mm in diameter. Experimental results show that the actuator can move upwards at a speed of 5.1cm/s. This cable-free actuator has many possible applications, including small pipe inspection and maintenance.
