Displacement control method of piezoelectric ceramics actuator

A piezoelectric ceramic, displacement control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of complex, difficult to understand, and application of the control system

Active Publication Date: 2015-12-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, since this control system uses feedforward controller and feedback controller at the same time, there are usually disadvantages such as complex control system, difficult to understand and use.

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  • Displacement control method of piezoelectric ceramics actuator
  • Displacement control method of piezoelectric ceramics actuator
  • Displacement control method of piezoelectric ceramics actuator

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] The invention provides a displacement control method of a piezoelectric ceramic actuator, which uses a control system of feedforward and feedback to control the displacement of the piezoelectric ceramic actuator. The structure of the control system is as follows figure 1 As shown, the hysteresis compensator based on the improved PI model is used as the feedforward part to compensate the nonlinear hysteresis characteristic of the piezoelectric ceramic actuator as a linear system, which improves the shortcoming of the traditional PI model with low fitting accuracy and can obtain more Good compensation effect; the displacement of the piezoelectric ceramic actuator is controlled by the combination of the disturbance estimator and the Backstepping controller, and the uncertain disturbance of the system can be estimated online through the disturbance estim...

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Abstract

The invention discloses a displacement control method for a piezoelectric ceramics actuator. The control precision of a high-precision servo positioning platform can be improved by adopting the method provided by the invention. According to the invention, a traditional PI hysteresis model is improved and two new parameters are introduced. The improved PI hysteresis model can have compensation on symmetry and residue displacement in an easily-implementing manner. Then, the sum of uncertain disturbance including errors of PI hysteresis compensation, model establishing errors and unknown interference is estimated online in real time and is fed to a backstepping controller, so that numerical values of constant parameters of the backstepping controller can be reduced; the control system robustness on external interference can be improved and the control effect of a control system can be enhanced. By adopting the method, good tracking precision and robustness can be maintained and the whole control system is simple in structure and convenient to implement.

Description

technical field [0001] The invention relates to the technical field of electromechanical control, in particular to a displacement control method of a piezoelectric ceramic actuator. Background technique [0002] Traditionally, the driving methods used for micro-displacement positioning usually use friction transmission, screw transmission, etc., but their nonlinear characteristics are strong, and the structure is relatively complicated, so it is difficult to meet the control requirements of small size and high precision. The inverse piezoelectric effect is a phenomenon in which an electric field is applied in the polarization direction of a piezoelectric crystal to produce controllable mechanical deformation. The piezoelectric ceramic actuator (Piezoelectric Actuator, PEA) made by using the inverse piezoelectric effect overcomes the shortcomings of traditional actuators, with high control accuracy (steady state up to 10 nanometers), fast response speed (about 10 microseconds...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 甘明刚王力乔陟陈杰窦丽华蔡涛邓方
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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