Magnetorheological Haptic Actuator for Compact Force and Vibration Feedback
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Solution Overview
Problem
Current magnetorheological dampers are expensive and have large volumes, limiting their application in haptic devices like haptic shoes and VR controllers, necessitating a downsized and cost-effective solution.
Innovation Solution
A haptic actuator using a magnetorheological elastomer and fluid, where the elastomer surrounds a ferrous elastomer and fluid, increases rigidity and viscosity upon magnetic field application, providing kinesthetic and vibration feedback through compression and restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetorheological dampers are used for haptic devices, then vibration control and shock absorption are improved, but volume and cost increase
Solution Approach 1:
The patent changes the physical parameters of the magnetorheological fluid by confining it within an elastomer housing that responds to magnetic fields. This transforms the fluid from a bulk damper component into a integrated actuator element, reducing overall volume while maintaining vibration control functionality through field-induced viscosity changes
Solution Approach 2:
The invention combines magnetorheological fluid with an elastomer housing to create a composite structure. This composite material approach integrates the damping function directly into the actuator body, eliminating the need for separate damper components and reducing overall device volume
2Reliability
If magnetorheological dampers are used for haptic devices, then vibration control and shock absorption are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the damper function with the haptic actuator function into a single integrated component. The magnetorheological fluid serves dual purposes: providing shock absorption and enabling haptic feedback, thereby eliminating the need for separate damper assemblies and reducing overall manufacturing cost
Solution Approach 2:
The magnetorheological fluid is designed to perform multiple functions simultaneously: vibration damping, shock absorption, and haptic feedback generation. This multi-functionality reduces the total component count and assembly complexity, leading to lower production costs
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 actuator offers miniaturized, cost-effective kinesthetic and vibration feedback, suitable for haptic shoes and VR controllers, enhancing user experience and reducing manufacturing costs.
Implementation Method 1
when an external magnetic field is applied, rigidity of the magnetorheological elastomer housing (110) increases
Implementation Method 2
viscosity of the magnetorheological fluid (130) increases
Implementation Method 3
when an external alternating current magnetic field is applied, the magnetorheological elastomer housing (110) generates vibration while being repeatedly compressed and restored
Data Source
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AI summary
The present invention relates to a haptic actuator using a magnetorheological elastomer and a magnetorheological fluid, which has a shape in which a magnetorheological elastomer surrounds a ferrous elastomer and a magnetorheological fluid, the haptic actuator being capable of providing kinesthetic feedback related to an external force by increasing rigidity of the magnetorheological elastomer and increasing viscosity of the magnetorheological fluid, and capable of providing vibration feedback by generating vibration by being repeatedly compressed and restored in shape when an alternating current magnetic field is applied.