Moving-Coil Linear Vibration Motor with Asymmetric Coil Angles
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Solution Overview
Problem
Existing linear vibration motors typically vibrate in a single direction, which is insufficient for applications requiring multi-directional vibration.
Innovation Solution
A moving-coil-type linear vibration motor design featuring a housing with oppositely connected elastic members, a mass block, coils forming acute or obtuse angles with respect to the elastic members' connection line, and magnets arranged to generate Lorentz forces in two perpendicular directions, allowing for vibration in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-direction vibrator assembly is used, then the structure is simple, but multi-directional vibration capability is lost
Solution Approach 1:
The vibrator assembly is segmented into two independent coils (first coil and second coil) that can be independently controlled. Each coil generates vibration in a specific direction, and by controlling the activation of different coils, the vibration motor can achieve multi-directional vibration capability while maintaining a relatively simple overall structure
Solution Approach 2:
The vibrator assembly is designed with multi-functionality by incorporating multiple coils that can operate independently or simultaneously. This universal design allows the same vibrator assembly to produce vibrations in multiple directions (single-direction, dual-direction, or circular vibration patterns) depending on the control signals applied to different coils
2Reliability
If magnets and coils are loosely mounted, then assembly is easy, but damage occurs upon impact
Solution Approach 1:
Mounting holes are pre-formed in the stator assembly at appropriate positions before the magnets and coils are installed. This preliminary preparation of the mounting structure allows for secure attachment of magnets and coils while maintaining ease of assembly, as the holes are already positioned correctly and components can be directly fastened without complex alignment procedures
3Adaptability or versatility
If coils are positioned at right angles to elastic members, then magnetic field alignment is optimal, but two-directional vibration is not achieved
Solution Approach 1:
The coils are deliberately positioned at asymmetric angles (acute angles) relative to the elastic members rather than at symmetric right angles. This asymmetric positioning, combined with the elastic members' mechanical properties, enables the system to achieve two-directional vibration capability while the angle specifications provide clear manufacturing guidelines
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
Enables two-directional vibration, providing a stronger vibration feel and increased stability through the use of Helbeck-structured magnetic steel and leaf spring structures, with secure mounting of magnets and coils to prevent damage upon impact.
Implementation Method 1
two coils, respectively fixedly connected with two sides of the mass block, and forming an acute angle or an obtuse angle with respect to a connection line between the centers of the two elastic members; two magnets, fixed on the housing and respectively spaced apart from a corresponding one of the coils, and forming an acute angle or an obtuse angle with respect to the connection line between the centers of the two elastic members. Lorentz forces acted on the two coils have the same direction
Implementation Method 2
two elastic members, oppositely connected on side walls of the housing; a mass block, hung inside the accommodation space of the housing through circumferential wall respectively connected with the two elastic members
Data Source
AI summary
The present disclosure provides a moving-coil-type linear vibration motor that includes a housing, having an accommodation space; two elastic members, oppositely connected on side walls of the housing; a mass block, hung inside the accommodation space of the housing through circumferential wall respectively connected with the two elastic members; two coils, respectively fixedly connected with two sides of the mass block, and forming an acute angle or an obtuse angle with respect to a connection line between the centers of the two elastic members; two magnets, fixed on the housing and respectively spaced apart from a corresponding one of the coils, and forming an acute angle or an obtuse angle with respect to the connection line between the centers of the two elastic members.