Effect of the Hydrodynamic Bearing on Rotor/Stator Contact in a Ring-Type Ultrasonic Motor

Takashi Maeno, David B. Bogy

研究成果: Article査読

51 被引用数 (Scopus)


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 obtained by calculating the actual rotor deformation due to a normal point load using a finite element elastic analysis code. 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. The disagreement between the friction coefficient needed in the numerical analysis and the experimentally measured one in the previous study, which did not include the air bearing, is settled as well.

ジャーナルIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
出版ステータスPublished - 1992 11月

ASJC Scopus subject areas

  • 器械工学
  • 音響学および超音波学
  • 電子工学および電気工学


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