Experimental Study of Micro Vibration of the Ring Gear in Internal Gear Motor and Pump Under Unstable Working Condition

  • Trong Hoa PhamEmail author
  • Dinh Tu Nguyen
  • Thanh Cong Nguyen
  • Juergen Weber
  • Lutz Müller
Conference paper
Part of the Lecture Notes in Networks and Systems book series (LNNS, volume 104)


Analysis of micro movement of the ring gear is important for the understanding of dynamic behavior of the internal gear motor and pump. This paper presents the experimental results of micro movement of the ring gear under different working conditions by using the micro displacement sensors. An interesting phenomenon of ring gear is that the backward whirl phenomenon in case of instability has been occurred and observed. Experimental results pointed out that if the internal gear motor and pump operate under stable conditions, the ring gear center has small vibration and it whirls in forwards sense. However, when the internal gear motor and pump runs at unstable working conditions then the vibration amplitude of ring gear reaches much large value and it turns into spinning in backward sense. Due to backward whirl phenomenon, the solid contact between the outer ring gear and inner housing can occur. This is an unwanted phenomenon for internal gear motor and pump during operation.


Micro vibration Backward and backward whirl Internal gear motor and pump Micro movement 



This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 107.03-2019.17.


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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Trong Hoa Pham
    • 1
    Email author
  • Dinh Tu Nguyen
    • 1
  • Thanh Cong Nguyen
    • 1
  • Juergen Weber
    • 2
  • Lutz Müller
    • 2
  1. 1.Faculty of Mechanical EngineeringUniversity of Transport and Communications (UTC)HanoiVietnam
  2. 2.Institute of Fluid PowerTechnical University of Dresden (TUD)DresdenGermany

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