Effect of the hydrodynamic bearing on rotor/stator contact in a ring-type ultrasonic motor

Takashi Maeno, David B. Bogy

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

A hybrid numerical analysis that includes the hydrodynamic bearing effect and elastic contact in a ring-type ultrasonic motor is presented. The two-dimensional time-dependent compressible Reynolds equation is solved numerically by a second-order time accurate, noniterative, factored implicit finite-difference algorithm. The rotor deformation is described by a one-dimensional Green's function. The contact problem is solved by an iteration method so that the contact condition and the hydrodynamic bearing condition are satisfied simultaneously. The results show that the hydrodynamic bearing effect, especially the squeeze effect, is significant for ultrasonic frequency contact of the rotor and stator. Surface roughness, contact area, and normal vibrating speed of the stator are important parameters in the hydrodynamic bearing. A disagreement between the friction coefficient needed in the numerical analysis and the experimentally measured one in a previous study.

Original languageEnglish
Pages (from-to)675-682
Number of pages8
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume39
Issue number6
DOIs
Publication statusPublished - 1992 Nov
Externally publishedYes

Fingerprint

Bearings (structural)
stators
Contacts (fluid mechanics)
Stators
rotors
Hydrodynamics
Rotors
ultrasonics
Ultrasonics
hydrodynamics
rings
numerical analysis
Numerical analysis
Reynolds equation
Green's function
coefficient of friction
iteration
surface roughness
Green's functions
Surface roughness

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

Cite this

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