Large torque large stroke rotary actuator with hybrid drive of piezoelectric stack and motor, and method

Abstract

A large torque large stroke rotary actuator with hybrid drive of a piezoelectric stack and a motor, and a method are disclosed. The actuator comprises an actuator piezoelectric stack; a rhombic ring installed at an outer side of the piezoelectric stack; a threaded rod connected to an end of the rhombic ring; a lock-up nut which is connected with the threaded rod through a thread, meanwhile acts as a rotating mechanism rotor, and is embedded with a drive rotor at an outer side; a connecting rod with a large pitch lead screw and connected to the other end of the rhombic ring, a lock-up nut connected with the connecting rod through a thread, used as a rotor and embedded with a drive stator at an outer side; a screw nut connected with the threaded connecting rod at the other end through the large pitch screw; and thrust ball bearings installed to two ends of the screw nut, the above structure being packaged in a housing. The invention further provides an actuation method, and can achieve stepping output of large torque large stroke rotary motion by driving the piezoelectric stack and the motor according to a certain order; and the actuator has the characteristics of large rotation drive stroke, bidirectional output large torque, power outage lock-up, and reliable and stable locking.

Description

technical field [0001] The invention relates to a rotary actuator and a method, in particular to a rotary actuator with large torque and large stroke driven by a piezoelectric stack and a motor and a method. Background technique [0002] With the continuous development of science and technology, higher requirements are put forward for the driving device in important industrial fields such as national defense, aerospace, and machinery manufacturing. Due to the limitations of its working principle and structural form, the traditional electromagnetic motor has been unable to meet the new requirements. requirements. In recent years, piezoelectric stack driving devices have effectively filled this gap. However, due to the shortcoming of the small actuating stroke of the piezoelectric material, it is difficult to realize the output of a large stroke, especially for the output of the rotary motion with a large rotation angle. Moreover, the stepping actuator designed solely with p...

AI Technical Summary

Problems solved by technology

However, due to the shortcoming of the small actuating stroke of the piezoelectric material, it is difficult to achieve the output of a large stroke, especially for the output of the rotary motion with a large rotation angle.

Moreover, the stepping actuator designed solely with piezoelectric materials is also difficult to guarantee the output locking ability of the actuator, and cannot meet the higher requirements for the actuator. There is an urgent need for a stepping actuator with a large driving stroke, a large output torque, and a resolution Stepping rotary actuator with high efficiency and reliable self-locking ability

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