Abstract
Based on the equivalent principle, a linear spring contact model was established for the friction layer between stator and rotor. Different contact conditions were described by a distance index δ. Detailed analysis of the nonlinear contact behavior especially the static and dynamic slipping was carried on using a space-time equation. A contact deflection angle was proposed to quantitatively express the influence of friction force on the output performance. A more precision simulation model was established based on the theoretical analysis, and influences of different preload pressures and elastic modulus E m of friction layer on output performance were analyzed. The results showed the simulation results had very good consistency with experimental results, and the model could well reflect the output characteristics of contact interface.
Highlights
Ultrasonic motor possesses some excellent performances compared to the traditional magnetic motor such as high power density, large torque at low speed, quick response, running silently, and standstill force without excitation in the high technique area [1,2,3]
Supposing only the friction layer produces deflection which has the same figure as stator surface, the normal contact pressures are different at different contact points between stator and rotor owning to the Advances in Mechanical Engineering
The nonlinear dynamic behavior of contact interface between stator and rotor was studied based on a simplified linear spring model
Summary
Ultrasonic motor possesses some excellent performances compared to the traditional magnetic motor such as high power density, large torque at low speed, quick response, running silently, and standstill force without excitation in the high technique area [1,2,3]. According to different driving principles, contact force produced by traveling wave is steady and continuous which can generate steady output performance [7]. Hirata and Ueha [8] established a frictional interface model in 1993, and Wallaschek [9] summarized research of the model periodically in 1998. Linear model with simple results is the main model of the contact interface between stator and rotor [10]. Studies on nonlinear factors mainly depend on experiments and finite element method [11,12,13], which cannot systematically expound the influencing factors and the varying law of contact behavior. Thereafter, a simulation model including the nonlinear behavior was established which provided the foundation of further optimum design of the friction interface
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