Abstract
A high-thrust screw-type piezoelectric ultrasonic motor with a three-wavelength exciting mode is proposed in this paper. The motor mainly includes a stator and a screw output shaft, and the stator is composed of twelve rectangular piezoelectric plates and a hollow metal elastomer with an internal thread. The stator can be excited to generate the combined micro ultrasonic vibration mode. With this ultrasonic vibration mode, a three-wavelength traveling wave can be synthesized. The three-wavelength traveling wave is used to drive the screw output shaft by means of the frictional force between the stator and the shaft. Rotary-linear motion can be achieved without any additional conversion mechanism. Large thrust output can be easily obtained using a three-wavelength exciting mode. The exciting mode is analyzed in detail. The prototype is designed, simulated, and fabricated. A series of experiments are carried out and the results indicate that the maximum output thrust is 50.8 N at an excitation frequency and peak-to-peak voltage of 28.9 kHz and 120 Vp-p, respectively. The maximum force density is 247.8 N/kg.
Highlights
Ultrasonic motors have attracted lots of attention in the past few decades due to their distinctive characteristics such as simple structure, low speed without a reducer, self-locking in the power-off state, anti-electromagnetic interference, rapid dynamic response, etc., which make them good candidates for precise positioning systems such as aerospace mechanisms, optical instruments, micro electromechanical systems, micro robots, and so on [1,2,3,4]
The ultrasonic motor based on circumferential traveling wave vibrations is an important type of piezoelectric actuator that utilizes the inverse piezoelectric effect of piezoelectric materials to produce micro-amplitude vibrations at ultrasonic frequencies
The stator is composed of metal elastomer and piezoelectricelements
Summary
Ultrasonic motors have attracted lots of attention in the past few decades due to their distinctive characteristics such as simple structure, low speed without a reducer, self-locking in the power-off state, anti-electromagnetic interference, rapid dynamic response, etc., which make them good candidates for precise positioning systems such as aerospace mechanisms, optical instruments, micro electromechanical systems, micro robots, and so on [1,2,3,4]. The ultrasonic motor based on circumferential traveling wave vibrations is an important type of piezoelectric actuator that utilizes the inverse piezoelectric effect of piezoelectric materials to produce micro-amplitude vibrations at ultrasonic frequencies. This type of motor generally includes a stator and a rotor. The traditional ultrasonic motor is generally designed with large preloads when applied in a precise positioning system that needs high thrust, which inevitably decreases the equipment lifespan [11,12,13].
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