High-precision and high-torque piezoelectric rotary actuation device and method including h-shaped structure

Abstract

The invention discloses a high-precision large-torque piezoelectric rotary actuation apparatus with an H-type structure and a method. An actuator comprises an actuator base, an output shaft mounted on the base and capable of rotating freely, two actuator arms connected with the output shaft through a flexible hinge respectively, rhombic rings connected to the end parts of the actuator arms, piezoelectric ceramics mounted in the rhombic rings, a piezoelectric ceramic 6 connected between the actuator arms, and an upper top cover connected with the base through a support column. The distance between the base and the top cover after the installation is smaller than the transverse length of the rhombic rings, so that the piezoelectric ceramics can be ensured to lock the rhombic rings by installation pre-tightening in a power failure condition and the rotary motion of the output shaft can be locked. The invention furthermore provides the actuation method for the actuator. The piezoelectric ceramics are driven according to a certain sequence, so that the high-precision large-torque rotary motion of the actuator can be output. The apparatus has the characteristics of light structure weight, small size, capability of outputting large torque and large rotary angle, and low power consumption of self-locking in power failure. The apparatus and the method have wide application prospects and extremely high application values.

Description

technical field [0001] The invention relates to an actuating device driven by piezoelectric ceramics, in particular to a high-precision and high-torque piezoelectric rotary actuating device and method with an H-shaped structure. Background technique [0002] In recent years, the continuous development of piezoelectric drive devices has supported the development and construction of important industries such as national defense, aerospace, and machinery manufacturing, and has also derived a wide variety of piezoelectric actuators. Piezoelectric ceramic actuators are difficult to achieve large stroke output, especially the torque output of large rotation angle is more difficult to achieve. Therefore, there is an urgent need for a step-by-step rotary actuating device with a simple and lightweight structure, a large driving stroke and a high resolution. SUMMARY OF THE INVENTION [0003] In order to meet the above requirements, the purpose of the present invention is to provide...

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Problems solved by technology

[0002] In recent years, the continuous development of piezoelectric actuators has supported the development and construction of important industries such as national defense, aerospace, and machinery manufacturing, and has also derived a wide variety of piezoelectric actuators. However, due to the shortcoming of piezoelectric materials with small actuating strokes, Piezoelectric ceramic actuators are difficult to achieve large stroke output, especially torque output with large rotation angle is even more difficult to achieve

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