Vibration Motor with Magnetic Stop Assemblies
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Solution Overview
Problem
Vibration motors supported by spring structures face reliability issues due to narrow vibration frequency bands and a high risk of the vibrator hitting the housing, resulting in noise and reduced performance.
Innovation Solution
A vibration motor design incorporating stop assemblies with magnetized first and second magnets, a guiding member, and coils to prevent the vibrator from colliding with the housing, eliminating the need for a spring structure and enhancing reliability by using magnetic repulsion to control the vibrator's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring structure is used to support the vibrator, then the vibrator can be supported and driven to reciprocate, but the reliability is difficult to guarantee and the vibrator has a high risk of hitting the housing
Solution Approach 1:
The patent replaces the mechanical spring support structure with a magnetic field-based stop assembly system. The stop assembly includes stop magnets that generate magnetic repulsion forces to prevent the vibrator from hitting the housing, eliminating the need for physical spring contacts and thereby improving reliability while preventing harmful vibrations.
Solution Approach 2:
The stop assembly is positioned in advance to create magnetic repulsion forces before the vibrator can reach the housing. The stop magnets are arranged to generate opposing magnetic fields that actively prevent the vibrator from making contact with the housing, countering the harmful effect before it occurs.
2Productivity
If a spring structure is used to support the vibrator, then the vibrator can be driven to reciprocate, but the vibration frequency band is narrow
Solution Approach 1:
The patent replaces the mechanical spring system with an electromagnetic actuation system using coils and magnets. This substitution allows for electronic control of the vibration frequency, enabling a wider vibration frequency band while eliminating the reliability limitations of mechanical spring structures.
3Length of moving object
If a spring structure is used to support the vibrator, then the vibrator can be driven to reciprocate, but the stroke of the vibration motor is small
Solution Approach 1:
The patent replaces the spring support structure with a guiding member and stop assembly system. The guiding member provides smooth linear guidance for the vibrator, allowing for a larger stroke range, while the stop assembly with magnetic repulsion prevents contact with the housing throughout the extended travel distance.
4Ease of operation
If the vibrator is allowed to vibrate freely, then the vibration feedback can be generated, but the vibrator may hit the housing resulting in noise
Solution Approach 1:
The patent uses magnetic repulsion forces from the stop assembly to prevent the vibrator from hitting the housing during vibration operation. This allows the vibrator to move freely within the magnetic field boundary, maintaining smooth vibration feedback operation while eliminating impact noise through non-contact magnetic restraint.
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 effectively prevents the vibrator from colliding with the housing, improving reliability, expanding the vibration frequency band, and allowing for a larger stroke, while avoiding the limitations of spring-supported motors.
Implementation Method 1
a vibration motor includes a housing having a receiving space, a vibrator received in the receiving space, and a coil that drives the vibrator to reciprocate
Implementation Method 2
two stop assemblies received in the receiving space and spaced apart from each other; and coils configured to drive the vibrator to reciprocate between the two stop assemblies
Data Source
AI summary
The present invention provides a vibration motor including: a housing having a receiving space; a vibrator received in the receiving space; coils configured to drive the vibrator to reciprocate; and two stop assemblies received in the receiving space and spaced apart from each other, the vibrator reciprocates between the two stop assemblies and includes first magnets spaced apart from each other and at least one second magnet arranged between the first magnets, every two adjacent first magnets of the first magnets have opposite magnetization directions, and a magnetization direction of the second magnets is perpendicular to a magnetization direction of the at least one first magnet. Compared with the related art, the vibration motor provided by the present invention has higher reliability.