No abstract

A contact model for describing the contact mechanics between the stator and slider of the standing wave linear ultrasonic motor was presented. The proposed model starts from the assumption that the vibration characteristics of the stator is not affected by the contact process. A modified friction models was used to analyze the contact problems. Firstly, the dynamic normal contact force, interface friction force, and steady-state characteristics were analyzed. Secondly, the infl uences of the contact layer material, the dynamic characteristics of the stator, and the pre-load on motor performance were simulated. Finally, to validate the contact model, a linear ultrasonic motor based on in-plane modes was used as an example. The corresponding results show that a set of simulation of motor performances based on the proposed contact mechanism is in good agreement with experimental results. This model is helpful to understanding the operation principle of the standing wave linear motor and thus contributes to the design of these types of motor.

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This paper presents a new linear piezoelectric actuator for linear translation. The positioning stage driven by the actuator has a very simple and compact structure consisting of a linear guide and the linear piezoelectric actuator. The operation principle of the linear piezoelectric actuator is first described. Then, the characteristics of the positioning stage are investigated. Experiments indicate that the step size is adjustable and the minimum is 26 nm with an inertial mass of 100 g in the open-loop condition; the stage motion driven by the actuator is controlled to the target position plus or minus <1 μm within 330 ms for a traveling distance of 10 mm in the closed-loop condition.