volume | PIER Journals

Abstract

Wireless power transmission (WPT) based on near-field inductive coupling is a promising solution to power a tether-less capsule robot (CR) for medical application, and it is normally implemented with a one-dimensional transmitting coil for exciting an alternating magnetic field and an three-dimensional (3-D) receiving coil onboard the CR for induction. The connection way of the 3-D receiving coil has an influence on its output power supplied to the CR, but a method for quickly selecting series/parallel connection is not available yet. This paper is dedicated to developing such a method. Firstly, an analytical expression of the output power of the 3-D receiving coil when selecting series/parallel connection was derived, and its correctness was experimentally validated: the calculated output power using the analytical expression matched well with the measured one, having an average deviation of 1.42%/0.57% when selecting series/parallel connection. Then, a criterion for quickly selecting the connection way was deduced from the analytical expression, which indicates that the connection way is much related to the CR load: when the CR load is smaller than a critical load, parallel connection enables a larger output power average; otherwise, series connection does. A calculation method of the critical load is also given, which can be determined by available parameters relating to the transmitting coil and 3-D receiving coil. Thus, this paper provides a guidance for quickly selecting the connection way of the 3-D receiving coil.

1. Guo, S., Q. Yang, L. Bai, and Y. Zhao, "Development of multiple capsule robots in pipe," Micromachines, Vol. 9, No. 6, 259-274, 2018.
doi:10.3390/mi9060259 Google Scholar

2. Park, H., D. Kim, and B. Kim, "A robotic colonoscope with long stroke and reliable leg clamping," International Journal of Precision Engineering and Manufacturing, Vol. 13, No. 8, 1461-1466, 2012.
doi:10.1007/s12541-012-0192-2 Google Scholar

3. Valdastri, P., R. J. Webster, C. Quaglia, A. Menciassi, and P. Dario, "A new mechanism for mesoscale legged locomotion in compliant tubular environments," IEEE Transactions on Robotics, Vol. 25, No. 5, 1047-1057, 2009.
doi:10.1109/TRO.2009.2014127 Google Scholar

4. Gao, J., G. Yan, S. He, F. Xu, and Z. Wang, "Design, analysis, and testing of a motor-driven capsule robot based on a sliding clamper," Robotica, Vol. 35, 521-536, 2017.
doi:10.1017/S0263574715000697 Google Scholar

5. Kim, H. M., S. Yang, J. Kim, S. Park, J. H. Cho, J. Y. Park, T. S. Kim, E. Yoon, S. Y. Song, and S. Bang, "Active locomotion of a paddling-based capsule endoscope in an in vitro and in vivo experiment (with videos)," Gastrointestinal Endoscopy, Vol. 72, No. 2, 381-387, 2010.
doi:10.1016/j.gie.2009.12.058 Google Scholar

6. Ciuti, G., A. Menciassi, and P. Dario, "Capsule endoscopy: From current achievements to open challenges," IEEE Reviews in Biomedical Engineering, Vol. 4, 59-72, 2012. Google Scholar

7. Carta, R., G. Tortora, J. Thoné, B. Lenaerts, P. Valdastri, A. Menciassi, P. Dario, and R. Puers, "Wireless powering for a self-propelled and steerable endoscopic capsule for stomach inspection," Biosensors and Bioelectronics, Vol. 25, No. 5, 845-851, 2010. Google Scholar

8. Jia, Z., G. Yan, Z. Wang, and H. Liu, "Efficiency optimization of wireless power transmission systems for active capsule endoscopes," Physiological Measurement, Vol. 32, No. 10, 1561-1573, 2011.
doi:10.1088/0967-3334/32/10/005 Google Scholar

9. Basar, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "Application of wireless power transmission systems in wireless capsule endoscopy: An overview," Sensors, Vol. 14, No. 6, 10929-10951, 2014.
doi:10.3390/s140610929 Google Scholar

10. Ke, Q., W. Luo, G. Yan, and K. Yang, "Analytical model and optimized design of power transmitting coil for inductive coupled endoscope robot," IEEE Transactions on Biomedical Engineering, Vol. 63, No. 4, 694-706, 2016.
doi:10.1109/TBME.2015.2469137 Google Scholar

11. Basar, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "Stable and high-efficiency wireless power transfer system for robotic capsule using a modified helmholtz coil," IEEE Transactions on Industrial Electronics, Vol. 64, No. 2, 1113-1122, 2017.
doi:10.1109/TIE.2016.2614268 Google Scholar

12. Basar, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "An improved wearable resonant wireless power transfer system for biomedical capsule endoscope," IEEE Transactions on Industrial Electronics, Vol. 65, No. 10, 7772-7781, 2018.
doi:10.1109/TIE.2018.2801781 Google Scholar

13. Carta, R., J. Thoné, and R. Puers, "A wireless power supply system for robotic capsular endoscopes," Sensors and Actuators A: Physical, Vol. 162, No. 2, 177-183, 2010.
doi:10.1016/j.sna.2009.12.025 Google Scholar

14. Gao, J., G. Yan, Z. Wang, S. He, F. Xu, P. Jiang, and D. Liu, "Design and testing of a motor-based capsule robot powered by wireless power transmission," IEEE/ASME Transactions on Mechatronics, Vol. 21, No. 2, 683-693, 2016.
doi:10.1109/TMECH.2015.2497083 Google Scholar

15. Luo, W., Q. Ke, G. Yan, and K. Yang, "Analytical computation of AC resistance of single-layer air-core Helmholtz coils," Progress in Electromagnetics Research C, Vol. 51, 111-119, 2014.
doi:10.2528/PIERC14042803 Google Scholar

16. Gao, J. and G. Yan, "A novel power management circuit using a super-capacitor array for wireless powered capsule robot," IEEE/ASME Transactions on Mechatronics, Vol. 22, No. 3, 1444-1455, 2017.
doi:10.1109/TMECH.2016.2646859 Google Scholar

Professor Jinyang Gao

Dr. Guozheng Yan

Dr. Yunbo Shi

Dr. Huiliang Cao

Dr. Kun Huang

Dr. Hui Gao

Dr. Jun Liu