Abstract
A kind of nonresonance shaking beam motors is proposed with the advantages of simple structure, easy processing, and low cost due to its wide application prospects in precision positioning technology and precision instruments. The normal vibration model between the stator and slider is divided into contact and noncontact types to investigate the nonresonance friction drive principle for this motor. The microscopic kinematics model for stator protruding section and the interface friction model for motor systems during both operating stages are established. Accordingly, the trajectory of the stator protruding section consists of two different elliptical motions, which differ from those of resonance-type motors. The output characteristic of the nonresonance shaking beam motor is proposed under steady working conditions with reference to the research method of standing-wave-type ultrasonic motors. Numerical analysis is used to simulate the normal vibration and mechanical output characteristics of the motor. Experimental and theoretical data fitting validates the numerical analysis results and allows the future optimization of nonresonance-type motors.
Highlights
Piezoelectric actuators are characterized by high efficiency, high positioning accuracy, fast response, and good stability [1,2,3]; these devices are effective precision actuation technologies for precision instruments [4, 5], guidance technology [6], biomedicine [7], and high-technology fields [8, 9]
Resonance-type linear piezoelectric motors include a type of linear motor based on “shaking beam” principle
This motor is composed of two piezoelectric vibrators with a phase difference of 90∘ to cause two-phase longitudinal vibration, the coupling effect of which produces an elliptical trajectory at the protruding section [10, 11]. This motor type can be developed with two Langevin-type transducers or a pair of piezoelectric ceramics and has simple structure, easy processing, and low cost
Summary
Piezoelectric actuators are characterized by high efficiency, high positioning accuracy, fast response, and good stability [1,2,3]; these devices are effective precision actuation technologies for precision instruments [4, 5], guidance technology [6], biomedicine [7], and high-technology fields [8, 9]. Resonance-type linear piezoelectric motors include a type of linear motor based on “shaking beam” principle This motor is composed of two piezoelectric vibrators with a phase difference of 90∘ to cause two-phase longitudinal vibration, the coupling effect of which produces an elliptical trajectory at the protruding section [10, 11]. With reference to the research method of the friction drive mechanism of standing wave motors, the longitudinal normal pressure and the tangential friction force on the interface between stator and slider will be obtained on the basis of the elliptical trajectory at the protruding section. The research results can provide a theoretical model for nonresonancetype piezoelectric motors and predict the mechanical properties of this type of motors
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