Single-electrical signal-stimulated rotation ultrasonic motor

Abstract

The invention discloses a single-electrical signal-stimulated rotation ultrasonic motor which comprises a mandrel, a group of piezoelectric ceramic sheets, a window-shaped staggered mode converter, a friction disk, a bearing, a spring and a nut, wherein the piezoelectric ceramic sheets, the window-shaped staggered mode converter, the friction disk, the bearing, the spring and the nut are sequentially sleeved on the mandrel, the piezoelectric ceramic sheets are connected with electrode sheets, the mandrel, the piezoelectric ceramic sheets, the electrode sheets and the window-shaped staggered mode converter form the stator part of the ultrasonic motor, the friction disk and the bearing form the rotor part of the ultrasonic motor, and the spring and the nut form a positive-pressure pretightening force adjusting mechanism of the rotor and the stator parts of the ultrasonic motor. In the invention, a single-electrical signal-stimulated working mode is adopted, the elliptical orbit motion of stator end surface particles is realized by utilizing the longitudinal vibration mode of the group of piezoelectric ceramic sheets, a rotor is driven to rotate, and the ultrasonic motor has simple control-driven system, easy manufacture, easy miniaturization and integration, low cost, small control difficulty and broad application prospect.

Description

technical field [0001] The invention belongs to the field of ultrasonic motors, in particular to a piezoelectric ultrasonic motor excited by a single electric signal. Background technique [0002] Ultrasonic Motor (USM), also known as ultrasonic motor, is an electromechanical coupling device that realizes electrical energy-mechanical energy conversion through the inverse piezoelectric effect of piezoelectric materials. Due to the advantages of electromagnetic interference and strong environmental adaptability, it has been increasingly widely used in medical, aerospace, robotics, MEMS and other technical fields. [0003] According to the vibration theory, ultrasonic motors can be divided into traveling wave ultrasonic motors and standing wave ultrasonic motors. Most traveling wave and standing wave ultrasonic motors use two sets of piezoelectric ceramic vibrators to excite the stator to generate two vibration modes with a certain phase difference. In this state, the particle...

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Problems solved by technology

[0005] However, several types of ultrasonic motors based on mode conversion reported in the existing literature have problems such as complex structure, difficult manufacturing, high requirements for manufacturing and assembly, and high cost, which restrict their application in industrial production.

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