Cascaded amplified type adjustable-step piezoelectric actuator

Abstract

A cascaded amplified type adjustable-step piezoelectric actuator comprises an external displacement amplification mechanism, an internal displacement amplification mechanism and a piezoelectric stack. The internal displacement amplification mechanism is sleeved in and fixed with the external displacement amplification mechanism, and the piezoelectric stack is arranged in the external displacement amplification mechanism or between the external displacement amplification mechanism and the internal displacement amplification mechanism; and the external displacement amplification mechanism and the internal displacement amplification mechanism are arranged vertical to each other. According to the cascaded amplified type adjustable-step piezoelectric actuator, the external displacement amplification mechanism is coupled with the internal displacement amplification mechanism, so that the piezoelectric stack produces displacement along the X direction after being electrified, the displacement is output in the Y direction after being amplified by the external displacement amplification mechanism, and the displacement of the Y direction is transmitted to the internal displacement amplification mechanism to be amplified to be output in the Z direction, thus, displacement can be output in the X,Y and Z directions, the displacement in the Z direction is amplified twice than that in the X direction, and accordingly, large displacement is output in the Z direction. The piezoelectric actuator is simple in structure, small in size and light in weight.

Description

technical field [0001] The invention relates to a piezoelectric actuator, in particular to a cascaded amplified piezoelectric actuator with adjustable step length. Background technique [0002] Actuators are widely used in all aspects of human life. In some fields (such as aerospace and medical fields), it is often required that the actuator can output both large and small steps, that is, it is required that the actuator not only has a larger Wide range of action, while the output displacement has a high resolution, and requires a simple structure, small size, and light weight. However, traditional piezoelectric actuators are difficult to have the above characteristics at the same time. Contents of the invention [0003] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a cascaded amplified piezoelectric actuator with adjustable step length, which can not only output displacement in a large range, but also h...

AI Technical Summary

Problems solved by technology

However, traditional piezoelectric actuators are difficult to have the above characteristics

Images