Electromagnetic Drive Structure Using Segmented Magnet for Two-Axis Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing vibration generator described in Patent Document 1 experiences weak vibration in the second direction and requires a large current to generate strong vibration, limiting its effectiveness.
Innovation Solution
An electromagnetic drive device is designed with a first yoke, a second yoke, a permanent magnet, and two excitation coils, where the coils are arranged with a protruding part in between, and the permanent magnet is magnetized to generate magnetic flux, allowing for vibration in two perpendicular directions by alternating current directions through the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional vibration generator structure is used, then the device is simple, but the vibration strength in the second direction is weak
Solution Approach 1:
The permanent magnet is segmented into three magnetized regions (first, second, and third regions) with alternating magnetic poles, allowing independent interaction with each excitation coil. This segmentation enables the generation of vibration in multiple directions without requiring a completely different structural design, thus improving vibration strength while maintaining reasonable structural complexity
Solution Approach 2:
The patent combines the functions of generating vibration in both the first and second directions within a single electromagnetic drive device structure. By integrating two excitation coils with different orientations and a multi-region permanent magnet, the device achieves multi-directional vibration capability without requiring separate vibration generators for each direction
2Force
If a large current is used to generate strong vibration in the second direction, then the vibration strength is sufficient, but the energy consumption increases
Solution Approach 1:
Different regions of the permanent magnet are magnetized with different polarities to create localized magnetic field interactions. The first region interacts primarily with one excitation coil while the second and third regions interact with the other coil, allowing efficient energy utilization in each direction without requiring excessive current throughout the entire system
Solution Approach 2:
The patent introduces a second excitation coil oriented perpendicular to the first excitation coil, creating a three-dimensional electromagnetic field interaction system. This dimensional addition allows vibration generation in multiple directions through coordinated activation of different coil-magnet region pairs, improving energy efficiency by utilizing spatial distribution rather than simply increasing current magnitude
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 enables the generation of sufficient vibration strength in both the X and Z directions, providing effective haptic feedback and adjustable vibration intensity.
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
The permanent magnet includes a first region, a second region positioned on one side of the first region in the second direction, and a third region positioned on another side of the first region in the second direction, wherein the first region is magnetized to be a first magnetic pole
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An electromagnetic drive device includes a permanent magnet attached to a surface of a first yoke facing a second yoke; and a first excitation coil and a second excitation coil 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 excitation coil and the second excitation coil. The permanent magnet includes a first region; a second region positioned on one side of the first region in the second direction; and a third region positioned on another side of the first region in the second direction. The first region is magnetized to be a first magnetic pole, and the second region and the third region are magnetized to be second magnetic poles. The first region is opposite to the first protruding part, a boundary between the first region and the second region is opposite to the first excitation coil, and a boundary between the first region and the third region is opposite to the second excitation coil.