A Cantilever Piezoelectric Rotary Actuator Using Permanent Magnet Electromagnetic Mixture to Adjust Friction

Abstract

The invention relates to a cantilever type piezoelectric rotary driver capable of adjusting friction by using mixing of permanent magnet and electromagnet, which belongs to the technical field of piezoelectric precision driving. The middle part of a bearing disk is fixedly connected to a rotating shaft; a shaft sleeve is installed in the middle of the rotating shaft; a pair of piezoelectric vibrators are asymmetrically clamped in the middle of the shaft sleeve; a bearing is mounted on a top cover, and the top cover is fixed on a base; the bottom of the rotating shaft is bonded to a rotating disk, the rotating disk is immersed in a magnetorheological fluid, the magnetorheological fluid is contained in a magnetorheological fluid container, a seal ring is adhered to the top of the magnetorheological fluid container, and the magnetorheological fluid container is placed on the base; cylinders are disposed on the periphery of the magnetorheological fluid container, a plurality of cylindricalpermanent magnets are disposed inside the cylinders, and annular coils are wound around the cylinders; and the upper and lower sides of the magnetorheological fluid container are bonded with annularmagnet yokes. Advantages and characteristics of the driver are that: a friction form of a contact surface is transformed into a form of solid-liquid / solid-solid, the friction wear of the contact surface is small, and the stability and reliability are improved; and the friction is controlled by controlling an excitation current, and a control mode is simple.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric precision drive, and in particular relates to a cantilever type piezoelectric rotary driver which utilizes permanent magnet electromagnetic mixing to adjust friction. Background technique [0002] With the continuous deepening of research in the microscopic field, precision positioning technology is becoming more and more important, and its technical development level directly affects the research process of microscopic field technology. At present, there are mainly the following types of precision actuators: piezoelectric ceramic actuators, plate-induced strain actuators, electrostrictive actuators, and shape memory alloy actuators. Among them, the piezoelectric ceramic driver has fast response speed, good electromagnetic compatibility, low power consumption, small size, low noise, no heat generation, large output power, and high displacement resolution. It is convenient to realize closed-l...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a cantilevered piezoelectric rotary driver using permanent magnet and electromagnetic hybrid friction adjustment. The technical problem to be solved is: to optimize the friction force adjustment device in the driver by introducing magneto-rheological fluid and coupling with the magnetic field. Solid friction to solve the problems of common piezoelectric actuators such as friction and wear caused by solid to solid, uneven distribution of friction force, and difficulty in quantitative adjustment of friction force; the use of permanent magnet electromagnetic hybrid adjustment friction also increases the controllable range

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