Linear Vibration Motor Compact Stator Embedding
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Solution Overview
Problem
Conventional linear vibration motors for portable consumer electronics face challenges in reducing the size of the housing due to the space taken up by the stator, which limits the miniaturization of the device.
Innovation Solution
The design incorporates a housing made of non-permeability magnetic material with a unique configuration of a stator and a vibrator, where the stator's ends are embedded into specific holes in the housing, allowing for a more compact structure by optimizing the magnetic field and the placement of permanent magnets and coils to enhance magnetic force without increasing the motor's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is inserted into the receiving hole and fixed to the housing, then the stator is securely fixed, but the stator takes up space in the housing which increases the overall size of the linear vibration motor
Solution Approach 1:
The patent repositions the permanent magnets from the stator to the vibrator, and places coils on the housing wall surrounding the receiving hole. This spatial rearrangement allows the magnetic field generation to occur in a different dimensional configuration, eliminating the need for the stator to occupy space within the receiving hole while maintaining secure fixing through the elastic support member.
Solution Approach 2:
The patent extracts the permanent magnets from the stator and relocates them to the vibrator. This extraction allows the stator to be simplified and fixed more compactly in the housing, reducing the space required for the stator assembly while maintaining the magnetic field generation function through the relocated magnets on the vibrator.
2Volume of moving object
If the stator is made compact to reduce housing size, then the overall motor size is reduced, but the magnetic force may be insufficient for effective vibration
Solution Approach 1:
The patent concentrates the magnetic field generation function at the local position of the vibrator by placing permanent magnets directly on it. This local quality enhancement ensures strong magnetic force interaction occurs precisely where needed, between the vibrator-mounted magnets and the coils on the housing wall, maintaining effective vibration force while allowing compact overall dimensions.
Solution Approach 2:
The patent uses the housing wall as an intermediary structure to mount the coils around the receiving hole. This intermediary placement allows the coils to be positioned optimally for magnetic field interaction with the vibrator-mounted permanent magnets, achieving sufficient magnetic force without requiring the stator to occupy additional space within the housing.
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 a reduction in the internal space of the linear vibration motor, allowing for a smaller form factor while maintaining effective vibration functionality, thus addressing the size constraints of portable electronic devices.
Implementation Method 1
a coil and a permanent magnet, wherein the permanent magnet is disposed in the receiving hole and the coil is disposed at an outer periphery of the receiving hole; the linear vibration motor further comprises a stator, wherein the stator comprises a fixed part fixed to the housing and a magnetic part fixed to the fixed part and surrounding the receiving hole
Data Source
AI summary
The present disclosure provides a linear vibration motor. The linear vibration motor includes: a housing and a stator; a vibrator including a mass with a receiving hole and a first driving member disposed in the receiving hole and fixed to the mass; and an elastic support member. The stator includes a fixed member fixed to the housing and passing through the mass via the receiving hole, and a second driving member fixed to the fixed member and spaced apart from the first driving member. One of the first driving member and the second driving member includes a permanent magnet, and the other includes a coil. A first through hole is formed in the top wall. A second through hole is formed in the bottom wall. Two opposite ends of the fixed member in the vibration direction are respectively embedded into the first through hole and the second through hole.