Dynamic characteristics of motor-gear system under load saltations and voltage transients

Wenyu Bai, Datong Qin, Yawen Wang, Teik C. Lim

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


In this paper, a dynamic model of a motor-gear system is proposed. The model combines a nonlinear permeance network model (PNM) of a squirrel-cage induction motor and a coupled lateral-torsional dynamic model of a planetary geared rotor system. The external excitations including voltage transients and load saltations, as well as the internal excitations such as spatial effects, magnetic circuits topology and material nonlinearity in the motor, and time-varying mesh stiffness and damping in the planetary gear system are considered in the proposed model. Then, the simulation results are compared with those predicted by the electromechanical model containing a dynamic motor model with constant inductances. The comparison showed that the electromechanical system model with the PNM motor model yields more reasonable results than the electromechanical system model with the lumped-parameter electric machine. It is observed that electromechanical coupling effect can induce additional and severe gear vibrations. In addition, the external conditions, especially the voltage transients, will dramatically affect the dynamic characteristics of the electromechanical system. Finally, some suggestions are offered based on this analysis for improving the performance and reliability of the electromechanical system.

Original languageEnglish (US)
Pages (from-to)1-16
Number of pages16
JournalMechanical Systems and Signal Processing
StatePublished - Feb 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications


  • Dynamic characteristics
  • Load saltations
  • Motor system
  • Permeance network model
  • Planetary gear system
  • Voltage transients


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