Magnetic Yoke Vibration Unit for Stable Tactile Feedback
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Solution Overview
Problem
Existing operation devices and vibration generating devices face instability in vibration magnitude due to unstable poses of movable and fixed components, leading to inconsistent tactile feedback.
Innovation Solution
The operation device incorporates a vibration generating unit with a movable yoke and a fixed yoke, a permanent magnet, and an exciting coil, where the magnetic attractive force and repulsive force interact with elastic supports to stabilize the vibration, ensuring consistent and stable vibrations by controlling the position of the movable yoke relative to the fixed yoke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration generating device uses a movable core supported by elastic portions, then vibration feedback can be provided, but the pose of the movable core becomes unstable leading to inconsistent vibration magnitude
Solution Approach 1:
The device is divided into separate functional components: a fixed yoke attached to the fixed portion, and a movable yoke attached to the movable portion. This segmentation allows independent optimization of each component's function while maintaining overall system stability.
Solution Approach 2:
The permanent magnet is positioned to create a magnetic field that acts on the movable yoke, establishing a magnetic potential well that stabilizes the movable yoke's position. The magnetic attractive force creates a stable equilibrium point that maintains consistent vibration characteristics.
2Reliability
If the movable yoke is energized by magnetic attractive force compressing the elastic support, then self-positioning is improved, but the initial configuration becomes more complex
Solution Approach 1:
The permanent magnet and exciting coil configuration enables the movable yoke to self-position through magnetic attractive force. The system automatically establishes the correct initial position by compressing the elastic support, eliminating the need for external positioning mechanisms or complex assembly procedures.
Solution Approach 2:
The mechanical positioning system is replaced with a magnetic field-based positioning system. Instead of using mechanical stops, guides, or adjustment mechanisms, the patent uses the interaction between the permanent magnet and movable yoke to achieve automatic self-positioning through magnetic forces.
3Force
If the exciting coil induces magnetic flux to create repulsive force, then vibration amplitude can be increased, but energy consumption increases
Solution Approach 1:
The exciting coil is driven to generate alternating current that periodically reverses the magnetic flux direction. This periodic action creates oscillating repulsive and attractive forces between the movable yoke and fixed yoke, generating vibration. The periodic nature of the current minimizes average energy consumption compared to continuous DC excitation.
Solution Approach 2:
The system changes the electrical parameters of the exciting coil, switching between different current states (off, ON, reverse ON) to control the magnetic flux. By adjusting the duration and timing of current flow, the system optimizes the balance between vibration amplitude generation and energy consumption.
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
This configuration provides stable vibrations and enhances tactile feedback, improving the self-positioning of the movable yoke, reducing rattles, and allowing for increased vibration amplitude, resulting in a more effective and stable operation device.
Implementation Method 1
by a magnetic attractive force of the permanent magnet, the movable yoke is configured to be energized in a direction of moving closer to the fixed yoke in the first direction
Implementation Method 2
the exciting coil being configured to induce magnetic flux in response to a current flowing through the exciting coil
Implementation Method 3
the first elastic support being compressed between the movable portion and the fixed portion
Data Source
AI summary
An operation device includes a movable portion, a vibration generating unit, a fixed portion, a detecting unit, and a control unit. The vibration generating unit includes a movable yoke attached to the movable portion, and a fixed yoke attached to the fixed portion and disposed facing the movable yoke in a first direction. The vibration generating unit includes a permanent magnet attached to one yoke among the movable yoke and the fixed yoke, both ends of the permanent magnet in the first direction being opposite magnetic poles created by magnetization. The vibration generating unit includes an exciting coil attached to a different yoke from the one yoke among the movable yoke and the fixed yoke, the exciting coil being configured to induce magnetic flux in response to a current flowing through the exciting coil.