Electromagnetic Vibrating Alarm With Linear Oscillating Magnetic Mass
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Solution Overview
Problem
Conventional non-acoustic alarms for portable objects, such as timepieces, face challenges in design complexity, large dimensions, high manufacturing costs, and significant power consumption, making them difficult to integrate and maintain in portable devices without compromising their functionality.
Innovation Solution
A non-acoustic alarm featuring an electromagnetic motor with a movable magnetic circuit and resilient connection elements, allowing for a simplified design, reduced dimensions, and lower power consumption, which can be easily integrated into portable objects like watches without major structural modifications, utilizing a magnetic assembly that generates a vibratory effect through controlled oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional non-acoustic alarm uses a piezoelectric motor with an eccentric weight, then the alarm can generate a vibratory effect, but the alarm takes up a relatively large amount of space and requires complex manufacturing techniques
Solution Approach 1:
The patent inverts the conventional design by making the magnetic circuit movable rather than stationary. The coil is fixed to the support, and the magnetic circuit is attached to the oscillating mass, reversing the traditional arrangement where the coil moves with the mass. This inversion simplifies the structure and reduces the space required.
Solution Approach 2:
The patent combines the magnetic circuit and the oscillating mass into a single integrated assembly. The magnetic circuit is directly attached to the mass, eliminating the need for separate mounting mechanisms and reducing overall complexity and space requirements.
2Reliability
If a conventional non-acoustic alarm uses a piezoelectric motor, then the alarm can generate vibration, but the manufacture involves relatively complex techniques
Solution Approach 1:
The patent replaces the piezoelectric motor with a simpler electromagnetic motor consisting of a coil and magnetic circuit. This substitution eliminates the need for complex piezoelectric ceramics and their precise assembly, allowing for easier manufacturing using conventional electromagnetic components.
Solution Approach 2:
The patent employs readily available electromagnetic components (coil, permanent magnets, ferromagnetic materials) that can be manufactured using standard, cost-effective techniques rather than requiring specialized piezoelectric manufacturing processes.
3Ease of manufacture
If a non-acoustic alarm is designed with simpler components, then the manufacturing cost is reduced, but the power consumption may increase
Solution Approach 1:
The patent employs periodic electrical pulses to drive the coil, creating oscillatory motion of the magnetic circuit and mass. By timing the pulses to match the resonant frequency of the system, the alarm achieves efficient vibration generation with minimal energy input, reducing overall power consumption.
Solution Approach 2:
The patent optimizes parameters such as coil winding density, magnetic circuit geometry, and pulse frequency to achieve resonance. By tuning these parameters, the system maximizes vibratory output for a given input power, thereby reducing power consumption while maintaining simple, low-cost 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 solution provides a discreet, efficient, and cost-effective non-acoustic alarm with reduced power consumption, optimized magnetic design, and compact dimensions, suitable for integration into portable objects like watches, enhancing user experience and device longevity.
Implementation Method 1
the movable magnetic circuit comprises a coil, a ferromagnetic core magnetically coupled to a magnetic cage forming an extension of the ferromagnetic core
Implementation Method 2
it comprises resilient connection elements resiliently connecting the movable magnetic circuit to the stationary magnetic circuit, the resilient connection elements being shaped to guide and ensure that the movable magnetic circuit undergoes a linear, or quasi-linear, oscillatory motion
Implementation Method 3
the magnetic assembly of said movable magnetic circuit constituting a movable magnetic mass of said non-acoustic alarm capable of generating said vibratory effect
Data Source
AI summary
A non-acoustic alarm for a portable object includes an electromagnetic motor which can be electrically controlled in order to generate a vibratory effect. The electromagnetic motor includes a movable magnetic circuit and a stationary magnetic circuit. The movable magnetic circuit includes a coil, a ferromagnetic core coupled to a magnetic cage forming an extension of the ferromagnetic core. The magnetic assembly of the movable magnetic circuit constitutes a movable magnetic mass of the non-acoustic alarm capable of generating the vibratory effect. The non-acoustic alarm includes resilient connection elements resiliently connecting the movable magnetic circuit to the stationary magnetic circuit. The resilient connection elements are shaped to guide and ensure that the movable magnetic circuit undergoes a linear, or quasi-linear, oscillatory motion during the electrical control of the electromagnetic motor.