Linear Vibration Motor Coil Configuration for Magnetic Field Utilization
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Solution Overview
Problem
Linear vibration motors suffer from low magnetic field utilization and moment deflection during vibration, leading to deflected vibrations that affect user experience.
Innovation Solution
A linear vibration motor design featuring a motor housing, stator, and elastic support member with a mass block and magnets, where the stator includes two coils and circuit boards with fixing plates and washer plates to optimize magnetic field utilization, reducing magnetic loss and stabilizing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-coil designs are used, then device complexity is reduced, but magnetic field utilization is low and moment deflection occurs
Solution Approach 1:
The single coil is divided into two separate coils (first coil and second coil) positioned on opposite sides of the mass block. Each coil independently generates magnetic field acting on opposite poles of the magnet, eliminating magnetic field leakage and improving utilization efficiency while maintaining manageable structural complexity through modular design.
Solution Approach 2:
Different regions of the magnetic field are optimized by placing coils at specific locations (opposite sides of the mass block) to target specific poles of the magnet. This localized magnetic field generation ensures efficient field utilization and prevents moment deflection by balancing forces on both sides.
2Length of moving object
If elastic support members are made flatter to reduce thickness, then portability is improved, but vibration stability deteriorates
Solution Approach 1:
The coil support function is extracted from the elastic support member and transferred to dedicated coil fixing plates. This separation allows the elastic support member to be optimized for flatness and thickness reduction while the fixing plates provide stable mechanical support for the coils, maintaining vibration stability without increasing overall thickness.
Solution Approach 2:
Coil fixing plates and washer plates are introduced as intermediary components between the coils and the motor housing. These intermediaries provide stable mounting for the coils while allowing the elastic support member to remain thin, thus decoupling the thickness constraint from vibration stability requirements.
3Stability of the object's composition
If coil fixing plates are added to stabilize coils, then magnetic field stability is improved, but device complexity increases
Solution Approach 1:
The coil fixing plate is merged with the circuit board as an integrated component. The circuit board serves dual functions: electrical connectivity and mechanical support for the coils. This integration reduces the number of separate parts while maintaining coil positioning stability, as the fixing plate is formed as part of the existing circuit board structure.
Solution Approach 2:
The circuit board is given multi-functionality by incorporating the coil fixing plate functionality. It simultaneously provides electrical pathways, mechanical support for coils, and structural integration with the motor housing through washer plates, thereby stabilizing coil positioning without adding dedicated single-function components.
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
The design enhances magnetic field utilization, providing a stronger driving force and preventing moment deflection, thus improving product performance and user experience by stabilizing vibrations during touch operations.
Implementation Method 1
an elastic support member which suspends the vibrator within the motor housing and is for supporting the vibrator and providing an elastic restoring force
Implementation Method 2
the vibrator comprises a mass block and magnets, the stator comprises coils and circuit boards
Implementation Method 3
the first coil and the second coil are located on two opposite sides of the mass block respectively
Data Source
AI summary
A linear vibration motor, comprising a housing, a stator, a vibrator, and an elastic support member (1). The vibrator comprises a mass block (2) and magnets (3). The stator comprises coils and circuit boards. The coils comprise a first coil (4) and a second coil (5). The circuit boards comprise a first coil fixing board (6) and a second coil fixing board (7). The first coil and the second coil are respectively located on two opposite sides of the mass block. The first coil is connected with the first coil fixing board. The second coil is connected with the second coil fixing board. The first coil fixing board is fixed on a first washer board (8). The second coil fixing board is fixed on a second washer board (9). The first washer board and the second washer board are respectively fixed on the motor housing. The vibration motor can reduce the loss of magnetic field and improve the utilization rate of magnetic field while implementing vibration feedback on a touch operation of a user.