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Eap actuator and driving method

An actuator, actuation technology, applied in the direction of piezoelectric device/electrostrictive device, piezoelectric/electrostrictive/magnetostrictive device, piezoelectric device or electrostrictive device components, etc. Solve problems such as the difficulty of fast and accurate mechanical response, hinder the application of EAP equipment, etc., to achieve the effect of improving performance

Inactive Publication Date: 2020-01-10
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This inconsistency can hinder the application of EAP devices, for example, it can cause difficulties in fast and accurate mechanical response

Method used

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  • Eap actuator and driving method
  • Eap actuator and driving method
  • Eap actuator and driving method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The present invention provides a method of driving an electroactive polymer (EAP) actuator and provides an EAP actuator capable of or adapted to perform the method. With the present invention, an adjusted drive scheme is used to more accurately change actuation from one actuation state (first actuation state or start actuation state) to another actuation state (second actuation state or desired actuation state) state). In particular, the actuator utilizes a look-up table storing look-up table data representative of the change in actuation level over time for actuation from a first actuation state to a second actuation state. The driver applies a drive waveform between the first drive voltage and the second drive voltage, the drive waveform taking into account the look-up table data. In this way, the actuator's response is taken into account, eg, based on different historical drive levels and the actuator's response to static drive levels, so that the actuator can be op...

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PUM

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Abstract

The proposed concept of driving an electroactive polymer actuator (70) makes use of a memory, comprising for example a look-up table (74), which stores data representing changes in actuation level over time for switching from a first actuation state to a second actuation state. A controller (76) controls a driver (72) to apply a drive waveform between two drive voltages, taking into account said stored data. In this way, non-ideal response (hysteresis, creep) of the actuator material is taken into account, so that the actuator may be operated as quickly and precise as possible. It is particularly suitable for ferroelectric relaxor polymers such as PVDF.

Description

technical field [0001] The present invention relates to electroactive polymer actuators and devices or systems comprising such actuators and methods for driving such actuators. The invention also relates to a computer-implemented invention for carrying out the method. Background technique [0002] An electroactive polymer actuator is a device capable of converting an electrical input into a (mechanical) output (eg force or pressure) or vice versa. Thus, the EAP actuator can be used as a mechanical actuator and, depending on the EAP used, often also as a sensor. To this end, EAP actuators contain electroactive polymers (EAPs), which are able to deform or change shape under the influence of an actuating stimulus or signal. Some examples of field-driven EAPs include piezoelectric polymers, electrostrictive polymers (eg, PVDF-based relaxation polymers), and dielectric elastomers, but there are others. [0003] EAP actuators can be easily made into various shapes, allowing for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/04H01L41/09H01L41/193H10N30/80H10N30/20H10N30/857
CPCH10N30/802H10N30/204H10N30/857
Inventor R·A·范德莫伦赫拉夫D·A·范登恩德M·T·约翰逊
Owner KONINKLJIJKE PHILIPS NV