Electromagnetic Drive Layout for Strong Two-Axis Vibration
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Solution Overview
Problem
Existing electromagnetic drive devices, such as those described in Japanese Laid-Open Patent Application No. 2017-205766, face challenges in generating sufficient vibration in the second direction due to their structural limitations, requiring large currents to achieve strong vibrations.
Innovation Solution
The electromagnetic drive device incorporates a first yoke and a second yoke with permanent magnets and excitation coils, where the coils are arranged with a protruding part in between, allowing for magnetic flux generation and alternating current directions to induce reciprocal motion in both the X and Z directions, enabling effective vibration generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional vibration generator structure is used, then the device structure is simple, but the vibration in the second direction is weak and requires large current
Solution Approach 1:
The permanent magnet is segmented into three magnetized regions (first, second, and third regions) with alternating magnetic poles along the second direction. This segmentation creates multiple magnetic flux paths through the excitation coils, enabling efficient vibration generation in the second direction without requiring large currents.
Solution Approach 2:
Different regions of the permanent magnet have different magnetization directions and polarities. The first region is magnetized to a first magnetic pole, while the second and third regions are magnetized to second magnetic poles, creating localized magnetic field variations that enhance vibration efficiency in specific directions.
2Force
If the permanent magnet has a single magnetized region, then the structure is simple, but insufficient vibration is generated in the second direction
Solution Approach 1:
The permanent magnet is divided into three distinct magnetized regions arranged along the second direction, with alternating magnetic poles. This segmentation enables the generation of strong vibration in the second direction by creating multiple magnetic flux paths that interact with the excitation coils.
Solution Approach 2:
The magnetic flux paths are arranged to extend in both the first direction (through the yokes) and the second direction (through the alternating magnetic poles of the permanent magnet). This multi-dimensional flux path configuration enables efficient vibration generation in the second direction without significantly increasing structural 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
This configuration allows for the generation of sufficient vibrations in both perpendicular directions, providing haptic feedback with adjustable strength, effectively addressing the structural limitations of previous devices.
Implementation Method 1
a first excitation coil and a second excitation coil attached to the second yoke to generate magnetic flux when being energized
Implementation Method 2
a permanent magnet attached to a surface of the first yoke facing the second yoke
Data Source
AI summary
An electromagnetic drive device includes a permanent magnet attached to a surface of a first yoke facing a second yoke; and first and second excitation coils to generate magnetic flux when being energized. The second yoke includes a base, and a first protruding part protruding from the base toward the first yoke, between the first and second excitation coils. The permanent magnet includes a first region; and second and third regions positioned on respective sides of the first region. The first region is magnetized to be a first pole, and the second region and the third region are magnetized to be second poles. The first region is opposite to the first protruding part, a boundary between the first and second regions is opposite to the first excitation coil, and a boundary between the first and third regions is opposite to the second excitation coil.