Halbach Magnet Assembly for Stronger Vibration Motor Drive
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Solution Overview
Problem
Existing vibration motors in portable electronic devices suffer from low magnetic field utilization and insufficient driving force due to simple magnetic circuit designs and single magnetization directions.
Innovation Solution
A vibration motor with a magnet assembly featuring a Halbach array structure and complex magnetization patterns, including three-pole or five-pole magnetization circuits, enhances magnetic field performance and driving force by optimizing magnet polarity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple magnetic circuit with single magnetization direction is used, then the device complexity is reduced, but the magnetic field utilization and driving force are insufficient
Solution Approach 1:
The magnet is divided into multiple magnetization regions (first through fifth magnetization regions) with different magnetization directions, creating a segmented magnetic circuit structure that generates a more complex and effective magnetic field pattern, thereby improving magnetic field utilization and driving force without requiring multiple separate magnets
Solution Approach 2:
Different regions of the magnet are assigned different magnetization directions (vertical to vibration direction for odd regions, along vibration direction for even regions) to create localized magnetic field variations that optimize the overall magnetic field distribution and interaction with the coil, enhancing the driving force
2Ease of manufacture
If a regular shape magnet with single magnetization direction is used, then the manufacturing is simplified, but the magnetic field performance is limited
Solution Approach 1:
The magnet is segmented into multiple magnetization regions with distinct magnetization directions, creating a complex magnetic field pattern that improves magnetic field performance and reliability while maintaining a single regular magnet structure that is relatively easy to manufacture
Solution Approach 2:
The magnetization direction parameter is varied across different regions of the magnet (vertical vs. along vibration direction) to optimize magnetic field performance without changing the physical shape or size of the magnet, maintaining manufacturing simplicity
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 improved magnetic field performance significantly increases the driving force, providing stronger vibration feedback and enhancing user experience.
Implementation Method 1
The vibration component typically consists of a mass block and a magnet fixed to the mass block, while the stator component includes a coil that interacts with the magnet to provide driving force
Implementation Method 2
the magnet has a magnetizing magnetic circuit with a Halbach array structure
Data Source
AI summary
This invention provides a vibration motor. The vibration motor includes a housing with a containment space, a vibration component, and a stator component. The vibration component includes a mass block, a magnet assembly fixed to the mass block, and an elastic component supporting the mass block in the containment space. The magnet assembly includes a magnet fixed to the mass block, which has a magnetized magnetic circuit with a Halbach array structure. By designing the magnetized magnetic circuit in a Halbach array manner, the complex distribution of magnetic pole enhances the magnetic field performance of the magnet assembly and significantly increases the driving force of the vibration motor, providing users with strong vibration feedback and enhancing user experience.