Partially Insulated Electrodes for Reliable Artificial Muscles

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Solution Overview

Problem

Current artificial muscles face limitations due to chemical buildup on non-insulated electrodes, leading to operation failure, and inefficiencies in fluid transport and control, particularly in soft robotics applications.

Innovation Solution

An artificial muscle system with a partially insulated electrode pair, where one electrode is insulated and coupled to the positive terminal of a power supply, while the other is coupled to the negative terminal, reducing chemical buildup and enhancing control and efficiency by directing dielectric fluid into an expandable region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a non-insulated electrode is electrically coupled to a positive terminal of a power supply, then the artificial muscle can be actuated, but chemical buildup (oligomerization) occurs on the exposed electrode surface leading to operation failure

Engineering Contradiction:

Improveactuation capabilityVSAvoidoperation reliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The electrode system is segmented into two distinct electrodes: a first non-insulated electrode and a second insulated electrode. This segmentation allows each electrode to have different functional properties - the non-insulated electrode enables efficient electrical coupling while the insulated electrode prevents chemical buildup, thereby resolving the contradiction between actuation capability and operation reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different surface qualities are applied to different electrodes: the first electrode maintains a non-insulated surface for optimal electrical contact and actuation efficiency, while the second electrode receives an insulator coating to prevent chemical buildup. This local differentiation of surface properties allows the system to simultaneously achieve both actuation power and operational reliability

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If fluidic actuators are used in artificial muscles, then the artificial muscles can perform tasks, but fluid transport through channels and tubes limits speed and efficiency

Engineering Contradiction:

Improvetask performance capabilityVSAvoidactuation speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent extracts and eliminates the fluid transport system (channels and tubes) from the artificial muscle design. By using direct electrical actuation of the electrode pair to control dielectric fluid movement, the system removes the intermediate fluid transport infrastructure that was limiting actuation speed and efficiency, while maintaining the ability to perform tasks through dielectric elastomer actuation

Inventive Principle:

Principle #2Taking out (Extraction)

3Force

If thermally activated polymer fibers are used, then the artificial muscles can generate force, but they are difficult to control and operate at low efficiencies

Engineering Contradiction:

Improveforce generation capabilityVSAvoidcontrol precision

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The patent replaces thermally activated mechanical actuation with electrically driven dielectric elastomer actuation. The electrode pair generates electrical fields that directly actuate the dielectric fluid and elastomer, providing precise control through electrical signals rather than thermal management, thereby improving both control precision and operational efficiency while maintaining force generation capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system provides improved actuation efficiency and reduced chemical buildup, enabling focused inflation and higher actuator power per unit volume, with enhanced displacement and force output, addressing the limitations of existing artificial muscles.

Implementation Method 1

a dielectric fluid housed within the housing. The electrode pair is actuatable between a non-actuated state and an actuated state such that actuation from the non-actuated state to the actuated state directs the dielectric fluid into the expandable fluid region

Methodology Applied

Scientific EffectDielectric: Dielectric

Implementation Method 2

an electrical insulator membrane fixed to a surface of the second electrode facing the first electrode

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Data Source

PatentUS12403588B2Artificial muscles comprising a partially insulated electrode pair and methods for optimizing voltage polarity conditions in the artificial muscles

Publication Date: 2025.09.02 TOYOTA JIDOSHA KK

AI summary

An artificial muscle system includes an artificial muscle and a power supply. The artificial muscle includes an electrode pair including a first electrode and a second electrode, an electrical insulator membrane fixed to the second electrode, a housing including an electrode region and an expandable fluid region, the electrode pair positioned in the electrode region of the housing, and a dielectric fluid housed within the housing. The power supply includes a positive terminal and a negative terminal. The positive terminal is electrically coupled to the second electrode. The negative terminal is electrically coupled to the first electrode. The electrode pair is actuatable between a non-actuated state and an actuated state such that actuation from the non-actuated state to the actuated state directs the dielectric fluid into the expandable fluid region.