Z-shaped single-mode standing wave linear ultrasonic motor based on multiple vibration modes of piezoelectric ceramics

Abstract

The invention provides a single-mode standing wave type linear ultrasonic motor with a Z-shaped structure based on multiple vibration modes of piezoelectric ceramics. The single-mode standing wave type linear ultrasonic motor comprises a stator and a rotor, wherein the stator comprises an upper surface piezoelectric ceramic, a left-end piezoelectric ceramic, a right-end piezoelectric ceramic, a left driving foot, a right driving foot and a metal elastomer; the metal elastomer is a Z-shaped metal elastomer; the metal elastomer comprises a middle part of the elastomer and a projection; the middle part of the elastomer and the projection are integrally presented as the Z-shaped structure; a left groove and a right groove are arranged in the both ends of the projection and the middle part of the elastomer respectively; the left-end piezoelectric ceramic is bonded in the left groove; and the right-end piezoelectric ceramic is bonded in the right groove. The piezoelectric ceramics are bondedto the ends and the upper surface of the metal elastomer of the motor stator; compared with a traditional piezoelectric ceramic which is singly bonded on the upper surface of the elastomer, the vibration amplitude of the stator can be increased, the size is small, the structure is compact, and the output of the motor is larger.

Description

technical field [0001] The invention relates to a Z-shaped structure single-mode standing wave linear ultrasonic motor based on multiple vibration modes of piezoelectric ceramics. Background technique [0002] The currently popular standing wave linear ultrasonic motor is mainly based on the transverse vibration mode and longitudinal vibration mode of the piezoelectric ceramic to excite the composite mode of the stator. The piezoelectric ceramic is mainly pasted on the top, bottom and front of the metal elastomer for simultaneous The two working modes are stimulated to combine to form a new working mode of the stator, forming an elliptical motion, and then driving the mover to move in a straight line. The stator structure of the composite mode linear ultrasonic motor must consider the excitation of multiple mode shapes at the same time, so the stator design process is relatively complicated. The single-mode linear ultrasonic motor only needs to consider the excitation of on...

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Problems solved by technology

[0005] The object of the present invention is to provide a Z-shaped structure single-mode standing wave linear ultrasonic motor based on piezoelectric ceramic multi-vibration modes. One of the three piezoelectric ceramics contained in the stator is pasted on the upper surface of the elastic body, and the other two are attached to the upper surface of the elastic body. The concave parts formed by the protrusions at both ends of the Z-shaped elastic body are closely bonded. Compared with the current popular linear ultrasonic motor, the motor has a compact structure and a larger output. It is suitable for driving small precision devices and solves problems in the prior art. The output is small, relatively suboptimal for the problem

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