Vibration Motor Magnetic Stabilization for Impact Resistance
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Solution Overview
Problem
Conventional vibration motors can experience unwanted vibration and discomfort when subjected to external impacts, such as those from writing operations, due to uncontrolled movement of the movable portion even when the coil is not energized.
Innovation Solution
The vibration motor design includes a peripheral wall portion with a magnetic portion and through holes, where the magnetic portion is strategically positioned to reduce interference with the magnetic force generated by the coil, and the through holes help in weight reduction and stabilization, preventing unwanted vibration of the movable portion when the coil is not energized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the movable portion is made lightweight to improve vibration response, then the vibration performance is improved, but the movable portion becomes more susceptible to external impacts causing unwanted vibration
Solution Approach 1:
The magnetic portion is positioned in advance to generate a preliminary magnetic force that counteracts external impacts before they cause unwanted vibration. This preemptive magnetic force stabilizes the movable portion, preventing the harmful effect of impact-induced vibration while maintaining the lightweight design for good vibration response.
Solution Approach 2:
The patent changes the magnetic field parameters by introducing a magnetic portion that generates a static magnetic force. This additional magnetic force parameter counterbalances the movable portion, reducing its susceptibility to external impacts while maintaining the lightweight construction for improved vibration response.
2Power
If the magnetic portion is positioned close to the coil to enhance magnetic force, then the driving efficiency is improved, but the interference with the magnetic force generated by the coil increases
Solution Approach 1:
The magnetic portion is strategically positioned to create a localized magnetic field in specific regions where it complements rather than interferes with the coil's magnetic force. This local optimization allows the magnetic portion to enhance driving efficiency in critical areas while minimizing interference in other regions.
Solution Approach 2:
The patent converts the potential harmful magnetic interference into a beneficial effect by carefully positioning the magnetic portion. The magnetic force that could have interfered with the coil is instead configured to supplement and enhance the overall magnetic drive, improving driving efficiency while eliminating the interference problem.
3Stability of the object's composition
If the housing structure is made solid to improve stability, then the structural stability is improved, but the weight increases and vibration damping is reduced
Solution Approach 1:
The housing employs a porous or lattice-like magnetic portion that provides structural stability through its geometric configuration rather than solid material. This porous structure maintains the necessary mechanical stability while significantly reducing the housing weight compared to a solid construction.
Solution Approach 2:
The patent uses composite construction combining magnetic and non-magnetic materials in the housing structure. This composite approach achieves structural stability through material properties and design while minimizing weight, avoiding the need for heavy solid construction.
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 design effectively reduces unwanted vibration and discomfort by stabilizing the movable portion and enhancing the driving efficiency and power consumption of the vibration motor, even in the absence of coil energization.
Implementation Method 1
When the coil is energized and a magnetic field is generated, the movable portion vibrates
Implementation Method 2
the magnetic portion... includes a magnetic body... preventing unwanted vibration of the movable portion when the coil is not energized
Data Source
AI summary
A vibration motor includes a stationary portion and a movable portion to vibrate in a central axis direction with respect to the stationary portion. The stationary portion includes a housing and a coil on an outer side in a radial direction of the movable portion. The movable portion includes a core portion including a magnet. The housing houses the movable portion and the coil, and includes a peripheral wall portion on an outer side in the radial direction of the coil and extending in an axial direction, and a magnetic portion on a portion of the peripheral wall portion and including a magnetic body. At least a portion of the magnetic portion opposes the coil in the radial direction and extends in a circumferential direction. The peripheral wall portion includes a through hole adjacent to the magnetic portion in the axial direction and extends in the circumferential direction.