Cantilever type piezoelectric rotary driver capable of adjusting friction by using mixing of permanent magnet and electromagnet

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 drives: piezoelectric drives, electrostrictive drives, and shape memory alloy drives. Among them, the piezoelectric driver has fast response speed, good electromagnetic compatibility, low power consumption, small size, low noise, no heat, large output power, high displacement resolution, and is convenient to realize closed-loop control together with power supply, displacement sensor, and microcomp...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a cantilever piezoelectric rotary driver using permanent magnet and electromagnetic hybrid friction adjustment. The technical problem to be solved is: by introducing magnetorheological fluid to optimize the solid-to-solid friction commonly existing in the friction force adjustment device in the driver, 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

Images