Haptic Electromagnetic Actuator With Alternating Pole Array
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Solution Overview
Problem
Existing haptic feedback mechanisms, such as vibratory motors, provide a limited range of sensations and lack the necessary travel distance and force for effective tactile feedback in computing devices.
Innovation Solution
A flat haptic electromagnetic actuator is developed using an array of electromagnets with alternating poles and an attraction plate, fabricated from a laminated metal sheet, which generates a large travel distance and high magnetic force, allowing for precise control of haptic responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional vibratory motors are used for haptic feedback, then the device structure is simple, but the travel distance is limited and the range of sensations is limited
Solution Approach 1:
The actuator is divided into multiple independent electromagnet assemblies arranged in an array, each capable of independent operation. This segmentation allows the attraction plate to be pulled by multiple magnets simultaneously, achieving greater travel distance while maintaining a relatively simple overall structure that can be integrated into existing devices.
Solution Approach 2:
The invention transitions from the traditional single-axis vibratory motion to a planar array configuration where multiple electromagnets are arranged in two dimensions. This dimensional change enables the attraction plate to move in a broader range of directions and distances, significantly increasing travel distance and the variety of haptic sensations while keeping each individual magnet assembly simple.
2Force
If traditional vibratory motors are used, then the device is compact, but the magnetic force is insufficient for effective tactile feedback
Solution Approach 1:
Multiple electromagnet assemblies are merged into a single coordinated system that acts on the attraction plate simultaneously. The combined magnetic force from multiple magnets provides strong tactile feedback, while the system can be controlled to activate only the necessary magnets, optimizing energy consumption based on the specific haptic effect required.
Solution Approach 2:
The invention replaces traditional mechanical vibratory motors with an electromagnetic system. This substitution eliminates mechanical wear and allows for precise control of magnetic force through electrical signals, providing stronger and more controllable tactile feedback while enabling energy-saving modes where only required electromagnets are activated.
3Adaptability or versatility
If an array of electromagnets is used to increase travel distance, then the haptic feedback range is improved, but the device complexity increases
Solution Approach 1:
The array of electromagnets is designed to perform multiple haptic functions through different activation patterns. By controlling which magnets are active and their timing, the system can produce various haptic effects including vibration, tapping, and resistance, making the electromagnet array a universal haptic actuator that replaces multiple specialized components.
Solution Approach 2:
The system achieves diverse haptic feedback by changing electrical parameters such as which electromagnets are activated, the duration of activation, and the timing sequences. These parameter changes allow a single electromagnet array structure to provide a wide range of haptic effects without increasing physical complexity.
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 provides a more forceful and abrupt sensation compared to traditional vibratory motors, enabling a wider range of tactile feedback experiences in computing devices like trackpads and smartphones.
Implementation Method 1
an array of electromagnets with alternating South and North poles on a first end, each magnet comprising a metal core and an electrical wire around the metal core
Implementation Method 2
the attraction plate moves toward the magnets when an electrical current flows through the electrical wire around the metal core
Data Source
AI summary
A haptic electromagnetic actuator for track pad is provided. The actuator includes an array of electromagnets with alternating South and North poles on a first end, each magnet comprising a metal core and an electrical wire around the metal core. The array of magnets is coupled to a base plate on a second end opposite to the first end. The actuator also includes an attraction plate at a distance from the first end of the array of the magnets such that the attraction plate moves toward the magnets when an electrical current flows through the electrical wire around the metal core and moves away from the magnets when the current becomes zero. The array of magnets is configured to form a uniform gap from the attraction plate.