Soft Electrostatic Seat Actuators for Low-Frequency Haptic Feedback
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Solution Overview
Problem
Current haptic actuators, such as eccentric rotating motors, linear resonant actuators, and voice coils, are inadequate for providing tactile feedback in low-frequency ranges essential for human interactions, as they are complex, inefficient, and difficult to integrate into soft, wearable devices due to their rigid materials and mechanical impedance mismatch with human tissue.
Innovation Solution
Hydraulically amplified soft electrostatic actuators (HASEL) are integrated into seating systems and interfaces, utilizing a deformable shell with fluid dielectric and electrodes to provide haptic feedback, seat adjustment, alert notifications, and massage functions, with encapsulating shells for insulation and cushioning, allowing for low-power, silent operation over a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electromagnetic actuators (ERMs, LRAs, VCAs) are used for haptic feedback, then vibration in the 100-300 Hz range can be provided, but they are complex, require multiple moving parts, and have mechanical impedance mismatch with soft tissue
Solution Approach 1:
The patent replaces electromagnetic actuators with electrostatic actuators that use electrical fields to deform soft dielectric materials, eliminating the need for rotating motors, moving parts, and complex mechanical assemblies. The electrostatic actuator uses electrodes and dielectric layers to generate controlled deformation through electrical voltage, substituting mechanical vibration mechanisms with field-based actuation.
Solution Approach 2:
The patent employs soft dielectric materials and flexible encapsulating shells as the actuator structure, replacing rigid electromagnetic components. The soft dielectric layer deforms under electrostatic fields to produce haptic feedback, while the flexible encapsulating shell provides mechanical support and protection without adding complexity, enabling integration into soft wearable devices.
2Power
If rigid electromagnetic actuators are used, then electromagnetic force actuation is achieved, but mechanical impedance mismatch with soft human tissue results in inefficient energy transfer
Solution Approach 1:
The patent uses soft dielectric materials and flexible encapsulating shells that match the mechanical impedance of human tissue, enabling efficient energy transfer. The soft materials deform naturally when in contact with skin, transferring haptic energy effectively without the rigid structure-provided mechanical mismatch of traditional actuators.
Solution Approach 2:
The patent employs composite structures combining soft dielectric materials, flexible encapsulating shells, and electrode layers to create an actuator with optimized mechanical properties. This composite design achieves both softness for tissue compatibility and sufficient structural integrity for effective haptic feedback delivery.
3Adaptability or versatility
If traditional haptic actuators are used, then vibration feedback is provided, but they cannot adequately represent low-frequency interactions (10-50 Hz) essential for human touch
Solution Approach 1:
The patent employs a dynamically controllable electrostatic actuator that can operate across a wide frequency range from low frequencies (10-50 Hz) to high frequencies (100-300 Hz) by adjusting the applied voltage waveform. The soft dielectric material's inherent compliance allows it to respond accurately to varying frequencies without the mechanical resonance constraints of traditional vibratory actuators.
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
HASEL actuators offer efficient, low-power, and silent operation, providing effective tactile feedback and haptic sensations across a wide frequency range, enhancing user experience and comfort in automotive and other human-machine interfaces without adding complexity.
Implementation Method 1
Each actuator includes a deformable shell defining an enclosed internal cavity, a fluid dielectric contained within the enclosed internal cavity, a first electrode disposed on a first side of the deformable shell, and a second electrode disposed on a second, opposing side of the deformable shell
Data Source
AI summary
A seating system includes a seat, with structures for supporting a user thereon, and actuators. Each actuator includes a deformable shell with an enclosed internal cavity containing a fluid dielectric contained, a pair of electrodes disposed on opposing sides of the deformable shell. The actuators are integrated into the structures and configured for providing at least one function, such as haptic feedback, seat adjustment, alert notification, vibratory signal, user input receiving, and massage function. A portion of the plurality of actuators may be enclosed within an encapsulating shell to form an encapsulated sheet of actuators. Each actuator may be a part of a button-on-demand system, wherein the actuator is normally in a collapsed position such that a user-facing surface of the encapsulating shell is substantially flat and, when activated by a user, the actuator is configured to expand such that the encapsulating shell is raised to form a button.