Linear Vibration Motor Gas Spring Magnetic Suspension
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Solution Overview
Problem
Existing linear vibrating motors face challenges in manufacturing due to complex elastic member structures and suffer from reduced lifespan due to high stresses during vibration, leading to premature wear and tear.
Innovation Solution
A linear vibrating motor design incorporating a gas spring and electromagnetic levitation using a pair of sliding pairs with magnets to suspend the vibrating unit, allowing for oscillation without mechanical fatigue, even beyond the maximum elastic deformation of traditional springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional elastic member with integrated arm and splints is used to suspend the vibrating unit, then the vibrating unit can be suspended and vibrated, but the elastic member suffers from mechanical fatigue and reduced lifespan due to high stresses during vibration
Solution Approach 1:
The patent replaces the traditional mechanical elastic member (arm and splints) with a magnetic suspension system using permanent magnets and electromagnetic coils. The vibrating unit is suspended magnetically without physical contact, eliminating mechanical stress and fatigue on suspension components. This substitution of mechanical suspension with electromagnetic suspension resolves the contradiction by removing the source of mechanical fatigue while maintaining the suspension function.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the stationary base and the vibrating unit. Instead of direct mechanical contact through elastic members, the magnetic field mediates the suspension and actuation forces. This intermediary approach allows force transmission without mechanical stress concentration, thereby extending the lifespan of the suspension system.
2Ease of manufacture
If an integrated elastic member with complex structure is used, then the vibrating unit can be suspended, but the manufacturing process becomes inconvenient and complex
Solution Approach 1:
The patent segments the suspension system into separate functional components: a base with coils, permanent magnets mounted on the base, and corresponding magnets on the vibrating unit. This segmentation replaces the integrated complex elastic member with simpler, modular components that are easier to manufacture and assemble individually, while achieving the same suspension function through their coordinated interaction.
Solution Approach 2:
By replacing the mechanically complex integrated elastic member with an electromagnetic suspension system, the patent eliminates the need for complex mechanical shaping and integration. The electromagnetic components (coils and magnets) are simpler to manufacture using standard electromagnetic component fabrication processes, thereby improving ease of manufacture while reducing structural complexity.
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 the motor's vibration amplitude and extends the lifespan by avoiding mechanical fatigue in the elastic components, providing a more reliable and durable tactile feedback mechanism.
Implementation Method 1
a gas spring 4 for providing an elastic force to the vibrator 3
Implementation Method 2
a sliding pair 6 for suspending the vibrator 3 in the housing 1
Implementation Method 3
a driving coil assembly 2 located on the lid 11 and facing the magnet assembly 32 for actuating the magnet assembly 32 oscillate
Data Source
AI summary
A linear vibration motor includes a housing, a PCB at least partially covered by the housing, a sliding pair, a vibrator suspended in the housing by the sliding pair, the vibrator including a plurality of holes in a middle portion thereof for receiving a magnet assembly, a driving coil assembly located on the lid and facing the magnet assembly for actuating the magnet assembly oscillate along a direction paralleled to the bottom wall of the crust, a pair of gas springs separately located at two ends of the vibrator for providing a constantly and alternatively restoring force to vibrator for oscillating freely.