A dime-size inchworm-like robot, which adopts wireless power transmission for power supply, has a great potential for a minimally invasive intestinal exploration. The powering coil onboard the robot is usually composed of a ring-shaped ferrite core and a ring-shaped winding. This paper presents a fast design method for power coil. Firstly, the integrated environment model of the powering coil is established by modeling the geometry of the ring-shaped winding, measuring the permeability distribution of the ferrite core, and analyzing the influence of eddy-current effect of the metal parts on the powering coil. Then, by referring to electromagnetic theory, the equivalent series resistance and mutual inductance of the powering coil are calculated. Finally, axial location, number of layers, number of turns, and wire diameter of the winding are optimized, with an aim of maximizing the output power of the powering coil and with a consideration of temperature rise safety and limited space. And some guiding rules for selecting the design parameters are obtained. The optimized winding, having a compact size of (12.0—12.4)mm×9.9mm, can output an electric power of 1478.3mW.
GAO Jinyang, YAN Guozheng, SHI Yunbo, LIU Jun
. Optimization of a Powering Coil Onboard a Dime-Size
Inchworm-Like Robot for Exploring the Intestine[J]. Journal of Shanghai Jiaotong University, 2020
, 54(2)
: 152
-159
.
DOI: 10.16183/j.cnki.jsjtu.2020.02.006
［1］沈悦, 姜志华, 颜国正, 等. 微型胃肠道机器人钳位机构和无线能量接收线圈的优化［J］. 上海交通大学学报, 2018, 52(1): 39-44.
SHEN Yue, JIANG Zhihua, YAN Guozheng, et al. Optimization and realization of wireless capsule robot［J］. Journal of Shanghai Jiao Tong University, 2018, 52(1): 39-44.
［2］陈雯雯, 颜国正, 王志武, 等. 肠道内窥镜活检机器人系统［J］. 上海交通大学学报, 2014, 48(5): 674-678.
CHEN Wenwen, YAN Guozheng, WANG Zhiwu, et al. Intestinal biopsy endoscopic robot system ［J］. Journal of Shanghai Jiao Tong University, 2014, 48(5): 674-678.
［3］贺术, 颜国正, 柯全, 等. 肠道驻留机构的设计和实验［J］. 光学精密工程, 2015, 23(1): 102-109.
HE Shu, YAN Guozheng, KE Quan, et al. Design and experiment of an intestinal anchoring mechanism［J］. Optics and Precision Engineering, 2015, 23(1): 102-109.
［4］PHEE L, ACCOTO D, MENCIASSI A, et al. Analysis and development of locomotion devices for the gastrointestinal tract［J］. IEEE Transactions on Biomedical Engineering, 2002, 49(6): 613-616.
［5］KWON J, CHEUNG E, PARK S, et al. Friction enhancement via micro-patterned wet elastomer adhesives on small intestinal surfaces［J］. Biomedical Materials, 2006, 1(4): 216-220.
［6］PARK H J, KIM D, KIM B. A robotic colonoscope with long stroke and reliable leg clamping ［J］. International Journal of Precision Engineering and Manufacturing, 2012, 13(8): 1461-1466.
［7］GAO J Y, YAN G Z, WANG Z W, et al. Design and testing of a motor-based capsule robot powered by wireless power transmission［J］. IEEE/ASME Transactions on Mechatronics, 2016, 21(2): 683-693.
［8］GAO J Y, YAN G Z. Locomotion analysis of an inchworm-like capsule robot in the intestinal tract［J］. IEEE Transactions on Biomedical Engineering, 2016, 63(2): 300-310.
［9］CHEN W W, YAN G Z, WANG Z W, et al. A wireless capsule robot with spiral legs for human intestine［J］. International Journal of Medical Robotics and Computer Assisted Surgery, 2014, 10(2): 147-161.
［10］HE S, YAN G Z, GAO J Y, et al. Frictional and viscous characteristics of an expanding-extending robotic endoscope in the intestinal environment［J］. Tribology Letters, 2015, 58(3): 1-10.
［11］CHEN W W, YAN G Z, HE S, et al. Wireless powered capsule endoscopy for colon diagnosis and treatment［J］. Physiological measurement, 2013, 34(11): 1545-1561.
［12］CARTA R, SFAKIOTAKIS M, PATEROMICHELAKIS N, et al. A multi-coil inductive powering system for an endoscopic capsule with vibratory actuation［J］. Sensors and Actuators A: Physical, 2011, 172(1): 253-258.
［13］GAO J Y, YAN G Z, WANG Z W, et al. A capsule robot powered by wireless power transmission: Design of its receiving coil［J］. Sensors and Actuators A: Physical, 2015, 234: 133-142.
［14］JIA Z W, YAN G Z, WANG Z W, et al. Efficiency optimization of wireless power transmission systems for active capsule endoscopes［J］. Physiological Measurement, 2011, 32(10): 1561-1573.
［15］GAO J Y, YAN G Z. A novel power management circuit using a super-capacitor array for wireless po-wered capsule robot［J］. IEEE/ASME Transactions on Mechatronics, 2017, 22(3): 1444-1455.
［16］LE BIHAN Y. Study on the transformer equivalent circuit of eddy current nondestructive evaluation［J］. NDT & E International, 2003, 36(5): 297-302.
［17］RAJU S, WU R X, CHAN M S, et al. Modeling of mutual coupling between planar inductors in wireless power applications［J］. IEEE Transactions on Power Electronics, 2014, 29(1): 481-490.
［18］WOJDA R P, KAZIMIERCZUK M K. Winding resistance of litz-wire and multi-strand inductors［J］. IET Power Electronics, 2012, 5(2): 257-268.
［19］YU Q, HOLMES T W, NAISHADHAM K. RF equivalent circuit modeling of ferrite-core inductors and characterization of core materials［J］. IEEE Transactions on Electromagnetic Compatibility, 2002, 44(1): 258-262.
［20］修成竹, 任亮, 李宏男. 自感式拉力传感器理论模型与实验研究［J］. 仪器仪表学报, 2016, 37(12): 2797-2804.
XIU Chengzhu, REN Liang, LI Hongnan. Theoretical model and experimental research of self-inductance tension sensor ［J］. Chinese Journal of Scientific Instrument, 2016, 37(12): 2797-2804.
［21］KAZIMIERCZUK M K. High-frequency magnetic components ［M］. Chichester, UK: Wiley, 2009: 45-46.
