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Indexed by:期刊论文

Date of Publication:2009-07-01

Journal:SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES

Included Journals:SCIE、EI

Volume:52

Issue:7

Page Number:2079-2086

ISSN No.:1006-9321

Key Words:variable diameter capsule robot; Radial offset distance; Magnetic torque; Equivalent magnetic charge method

Abstract:A drive and control method is put forward for a variable diameter capsule micro robot to screw forward in intestine using magnetic coupling between an inner actuator inside the robot and the rotational magnetic field generated by a rotating outer actuator. The structures of the outer and inner actuators are magnet cylinders with multiple magnetic poles in tegular shape alternating with dissimilar radial magnetization. An universal mathematical model of magnetic torque at eccentric state is established based on the equivalent magnetic charge method, and the characteristics of magnetic torque with respect to structural parameters of actuators are theoretically studied. Experiments show that the driving method features advantages such as powerful magnetic torque, high safety, reliability, etc. The driving ability of the variable diameter capsule micro robot is greatly improved by its automatic radial clearance compensation. The magnetic drive system has a promising prospect of medical applications in intestine.