Parallel Linear Vibration Motor for Miniaturization
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Solution Overview
Problem
Conventional micro-vibration motors in portable electronic devices face challenges in miniaturization due to the perpendicular placement of permanent magnets and coils, resulting in inefficient magnetic field utilization and reduced vibration effectiveness.
Innovation Solution
The linear vibration motor design places the vibrator and stator in parallel, with the electromagnet in the stator generating a variable magnetic field to drive the vibrator reciprocally along a parallel direction, optimizing magnetic field lines and reducing motor volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the permanent magnet and coil are placed perpendicular to each other to maximize magnetic field utilization, then the magnetic flux through the coil is improved, but the motor occupies a larger space which hinders miniaturization
Solution Approach 1:
The patent transitions from a traditional perpendicular arrangement (one dimension of interaction) to a parallel arrangement where the vibrator and stator are disposed side-by-side. This dimensional reconfiguration allows the magnetic field lines to be redirected through the electromagnet, enabling effective magnetic coupling while reducing the motor's overall footprint and enabling miniaturization.
2Loss of energy
If the permanent magnet is vertically magnetized to generate magnetic field lines, then the magnetic field is utilized, but the magnetic flux passing through the coil is insufficient resulting in weak vibration force
Solution Approach 1:
The electromagnet serves as an intermediary component that redirects and concentrates the magnetic field lines generated by the vertically magnetized permanent magnet. By positioning the electromagnet between the permanent magnet and the coil, it channels the magnetic flux more effectively through the coil, thereby enhancing the vibration force without requiring a change in the permanent magnet's magnetization direction.
3Force
If the vibrator and stator are arranged perpendicular to each other to generate magnetic field interaction, then the push-pull force is produced, but the structure occupies more space reducing miniaturization capability
Solution Approach 1:
The patent merges the vibrator and stator into a parallel arrangement where they occupy adjacent spaces rather than perpendicular volumes. This combining approach maintains the necessary magnetic field interaction for generating push-pull forces while consolidating the structural footprint, thereby enabling motor miniaturization without sacrificing force generation capability.
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 enhances miniaturization and increases vibration efficiency by maximizing magnetic flux through the coil, resulting in faster and stronger linear vibration responses.
Implementation Method 1
an electromagnet in the stator generates a variable magnetic field after being energized, so as to drive the vibrator to conduct a reciprocating motion along a direction parallel to a plane in which the stator is located, by changing directions of magnetic field lines of the magnetic field
Implementation Method 2
a permanent magnet in the vibration block and an electromagnet in the stator generate push-pull forces which interact with each other
Data Source
AI summary
A linear vibration motor comprises a vibrator and a stator arranged parallel to the vibrator. The vibrator comprises a counterweight block and a vibration block embedded and fixed in the counterweight block. Permanent magnets in the vibration block and electromagnets in the stator generate the push-pull forces acting on each other. The electromagnets in the stator generates a variable magnetic field after being energized, and drives the vibrator to move reciprocally along the direction parallel to the plane in which the stator is located by changing the direction of the magnetic field lines of the magnetic field. With the repulsive force between two ends the permanent magnets having the same polarity, the linear vibration motor allows the magnetic field lines of the permanent magnets to concentratedly pass through coils, thus obtaining a larger magnetic flux and a stronger vibration effect.