Abstract
A hollow, linear, nut-type, ultrasonic motor based on two degenerate, 3 rd -order bending modes in the section plane of cylinders is presented in this paper. The stator and rotor of the motor are both cylindrical and hollow, making the motor appropriate for applications where a light path, electric wire or optic fiber is required to pass through the motor. A new structure with four PZT plates bonded on the stator is proposed here. and the other had all eight sides bonded with PZT plates. The results show that the new design with four PZT plates has a higher mechanical quality factor, vibrates with larger amplitude, and has comparable performance to the stator with eight PZT plates. The motor with four PZT plates reached an upward speed of 0.95 mm/s when the load force was 3 g, and the maximum thrust force was 0.35 N. DOI: http://dx.doi.org/10.5755/j01.mech.22.6.13366
Highlights
Ultrasonic motors (USMs) are a new type of motor that uses piezoelectric units to generate ultrasonic vibration in the stator and uses the vibration of the stator to drive the rotor by friction force between the rotor and stator
linear ultrasonic motors (LUSM) utilizing bending modes of a beam were proposed under direct inspiration of the idea of the disk type travelling wave rotary USM
We have developed a thread-drive, nut-type travelling wave LUSM that utilizes the two secondorder or third-order bending modes in the section plane [1820]
Summary
Ultrasonic motors (USMs) are a new type of motor that uses piezoelectric units to generate ultrasonic vibration in the stator and uses the vibration of the stator to drive the rotor by friction force between the rotor and stator. LUSMs utilizing bending modes of a beam were proposed under direct inspiration of the idea of the disk type travelling wave rotary USM. Both travelling wave and standing wave excitation methods have been developed for this type of motor [2,3,4]. When the two transducers are excited with a 90degree temporal phase difference, an elliptic motion is generated at the tip of the angle or hinge [9,10,11,12,13] These three motor types are complicated because of the separate slider and stator. The internal loss and stiffness are both impeding aspects for the resonant vibration amplitude of the stator
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