This paper proposes a cableless in-piping
magnetic actuator that exhibits a very high-speed locomotion into inner pipe of
8 mm. The cableless
magnetic actuator is moved according to the vibration amplitude and resonance
energy of a mass-spring system excited by using an electromagnetic force. The
iron core size of the bobbin type electromagnet was roughly designed by
computer simulation and then optimized experimentally. The proposed actuator
incorporates an electrical inverter that directly transforms DC from button
batteries into AC. The electrical DC-AC inverter incorporates a mass-spring system, a reed
switch and a curved permanent magnet that switch under an electromagnetic
force. The duty ratio is changed into this electrical inverter by changing the
position of the curved magnet and the reed switch. Experimental result
demonstrates that the cableless magnetic actuator was able to move horizontally
at 471 m, and horizontal
speed at 327 mm/s when Maxell
SR621W silver-oxide button batteries were used.
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