Miniature piezoelectric monocrystal linear motor

Abstract

The invention discloses a miniature piezoelectric monocrystal linear motor. The miniature motor comprises a piezoelectric monocrystal driver, a slide block and a drive power supply, wherein the piezoelectric monocrystal driver is a square-columnar piezoelectric monocrystal; a friction block is arranged in the centre of the lower surface of the piezoelectric monocrystal; the friction block is in frictional contact with the slide block; four electrodes which are respectively distributed on four edges symmetrically are arranged on the piezoelectric monocrystal along four axial directions; and a voltage generated by the drive power supply excites the piezoelectric monocrystal to perform high-frequency small-amplitude (nano-grade to micron-grade) directional vibration or synthetic elliptic orbit motion so as to drive the slide block to perform linear motion. The invention provides a compact linear drive structure, which has the characteristics of capability of greatly reducing a working voltage, simple structure and small size, and is particularly suitable to be used for driving ultra-miniature optical lens to zoom and the like. A piezoelectric monocrystal material has extremely high low-temperature piezoelectric property, so the miniature piezoelectric monocrystal linear motor also can be used for low-temperature or spatial precise driving.

Description

technical field [0001] The invention belongs to the technical field of precision driving components, and in particular relates to a miniature piezoelectric single-crystal linear motor. Background technique [0002] Compared with traditional electromagnetic motors, piezoelectric micromotors and piezoelectric drivers have shown many unique advantages, such as relatively high power density, large driving force, and relatively high efficiency. The manufacture of traditional electromagnetic motors in the order of several millimeters has become very difficult, and its efficiency is only a few percent (<8%) at several millimeters, because it lacks a strong enough magnetic field. The efficiency of piezo motors has neither size effects nor magnetic field issues. Piezo motors maintain low speed, and relatively high torque characteristics even at millimeter sizes. As precision driving components, piezoelectric motors and drivers are becoming the key components of some high-tech p...

AI Technical Summary

Problems solved by technology

The advantage of this piezoelectric drive system is a relatively simple structure and low operating voltage. The disadvantage is that the vibration system relies on inertial force to drive the efficiency of the system, and the vibration system itself is also sensitive to external vibrations.

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