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Micromachines 2018, 9(2), 68;

Design of Microscale Magnetic Tumbling Robots for Locomotion in Multiple Environments and Complex Terrains

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088, USA
A. Leon Linton Department of Mechanical Engineering, Lawrence Technological University, Southfield, MI 48075-1058, USA
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 25 January 2018 / Accepted: 30 January 2018 / Published: 3 February 2018
(This article belongs to the Special Issue Micro/Nano Robotics, Volume II)
Full-Text   |   PDF [3292 KB, uploaded 7 February 2018]   |  

Simple Summary


This paper presents several variations of a microscale magnetic tumbling ( μ TUM) robot capable of traversing complex terrains in dry and wet environments. The robot is fabricated by photolithography techniques and consists of a polymeric body with two sections with embedded magnetic particles aligned at the ends and a middle nonmagnetic bridge section. The robot’s footprint dimensions are 400 μ m × 800 μ m. Different end geometries are used to test the optimal conditions for low adhesion and increased dynamic response to an actuating external rotating magnetic field. When subjected to a magnetic field as low as 7 mT in dry conditions, this magnetic microrobot is able to operate with a tumbling locomotion mode and translate with speeds of over 60 body lengths/s (48 mm/s) in dry environments and up to 17 body lengths/s (13.6 mm/s) in wet environments. Two different tumbling modes were observed and depend on the alignment of the magnetic particles. A technique was devised to measure the magnetic particle alignment angle relative to the robot’s geometry. Rotational frequency limits were observed experimentally, becoming more prohibitive as environment viscosity increases. The μ TUM’s performance was studied when traversing inclined planes (up to 60°), showing promising climbing capabilities in both dry and wet conditions. Maximum open loop straight-line trajectory errors of less than 4% and 2% of the traversal distance in the vertical and horizontal directions, respectively, for the μ TUM were observed. Full directional control of μ TUM was demonstrated through the traversal of a P-shaped trajectory. Additionally, successful locomotion of the optimized μ TUM design over complex terrains was also achieved. By implementing machine vision control and/or embedding of payloads in the middle section of the robot, it is possible in the future to upgrade the current design with computer-optimized mobility through multiple environments and the ability to perform drug delivery tasks for biomedical applications. View Full-Text
Keywords: mobile microrobot; magnetic actuation; tumbling locomotion mobile microrobot; magnetic actuation; tumbling locomotion

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary materials

  • Supplementary File 1:

    ZIP-Document (ZIP, 48767 KB)

    The zip file containing Supplemental Files 1 through 5

  • Supplementary File 2:

    MP4-Document (MP4, 14652 KB)

    S1: μTUM lengthwise and sideways tumbling modes and inclination angle tests

  • Supplementary File 3:

    MP4-Document (MP4, 6892 KB)

    S2: μTUM locomotion tests

  • Supplementary File 4:

    MP4-Document (MP4, 8564 KB)

    S3: μTUM locomotion in different environmental conditions

  • Supplementary File 5:

    MP4-Document (MP4, 14491 KB)

    S4: μTUM inclined plane traversal tests

  • Supplementary File 6:

    MP4-Document (MP4, 4264 KB)

    S5: μTUM traveling over different terrains


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MDPI and ACS Style

Bi, C.; Guix, M.; Johnson, B.V.; Jing, W.; Cappelleri, D.J. Design of Microscale Magnetic Tumbling Robots for Locomotion in Multiple Environments and Complex Terrains. Micromachines 2018, 9, 68.

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