Vibration Unit With Magnetic Insulator Rings For Noise Reduction
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Solution Overview
Problem
Existing vibration units face challenges in achieving accurate vibration frequency control, synchronizing with audio, and reducing mechanical noise, particularly in products with large weights or requiring high power.
Innovation Solution
A vibration unit design featuring a shell with a hollow cavity, a vibration shaft, multiple permanent magnet rings, magnetic insulator rings, and coils, where current changes in the coils alter the magnetic field to drive the vibration shaft, supported by elastic structures with noise-reduction spacers, ensuring efficient vibration and reduced noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a motor is used to drive a rotor to rotate, then the vibration frequency is directly related to the speed of the motor, but the vibration frequency is difficult to control and mechanical vibration noise occurs
Solution Approach 1:
The patent replaces the motor-driven mechanical vibration system with an electromagnetic driving system. Coils generate magnetic fields that interact with permanent magnets on the vibration shaft, producing electromagnetic forces that drive vibration. This substitution eliminates the need for rotational motion and mechanical coupling, enabling precise frequency control through electrical signals while reducing mechanical vibration noise.
Solution Approach 2:
The patent employs periodic electromagnetic excitation by controlling the current through the coils in a periodic manner. By adjusting the frequency of the periodic current, the vibration frequency can be precisely controlled to match audio signals. The elastic support structures provide periodic restoring forces that maintain stable oscillation at the desired frequency.
2Power
If a moving-coil is used to drive a vibrating plate, then the vibration effect is achieved, but the low power of vibration cannot meet product requirements and cannot drive products with large weight
Solution Approach 1:
The patent merges multiple permanent magnet rings and coils to create a multi-point electromagnetic driving system. Instead of a single moving-coil actuator, multiple electromagnetic interaction points are distributed along the vibration shaft, collectively generating higher driving force. This merged configuration enables the system to produce sufficient power to drive heavy products while maintaining vibration quality.
3Object-generated harmful factors
If electromagnetic drive is used to achieve vibration effect by elastic sheet suppression, then the vibration effect is achieved, but mechanical noise cannot be reduced
Solution Approach 1:
The patent introduces noise-reduction spacers as intermediary elements between the vibration shaft and the elastic support structures. These spacers act as vibration isolators that decouple the vibration transmission path, reducing the transmission of mechanical noise to the housing. The spacers maintain the electromagnetic driving function while effectively suppressing noise propagation.
4Object-affected harmful factors
If elastic support structures are used to support the vibration shaft, then the vibration shaft is supported, but noise is transmitted to the shell through the elastic sheet
Solution Approach 1:
The patent employs composite elastic support structures combining elastic sheets with reinforcing sheets and noise-reduction spacers. The elastic sheets provide flexibility and vibration isolation, while the reinforcing sheets add structural strength. The noise-reduction spacers, made from materials with different damping characteristics, further suppress noise transmission. This composite structure achieves both mechanical strength and noise reduction effectiveness.
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 vibration effect, reduces mechanical noise, and supports high-power operation, maintaining a compact and aesthetically pleasing cuboid structure suitable for various applications like small speakers and gaming devices.
Implementation Method 1
a change in a current flowing through each of the coils causes magnetic field force at two ends of each of the permanent magnet rings to change, so as to produce vibration of each of the permanent magnet rings in proportion to the change in the current
Implementation Method 2
each of the elastic support structures includes an elastic sheet and a reinforcing sheet; the elastic sheet has one end fixedly connected to the shell and another end fixedly connected to one end of the reinforcing sheet
Data Source
AI summary
A vibration unit includes a shell with a hollow cavity, a vibration shaft arranged in the hollow cavity and coils, wherein the shell is provided with two elastic support structures located at two ends of the vibration shaft, and at least two permanent magnet rings and at least one magnetic insulator ring are fixed to an outer periphery of the vibration shaft, with each magnetic insulator ring arranged between every two adjacent permanent magnet rings. The coils are fixed on an inner wall of the hollow cavity and located on an outer periphery of each of the permanent magnet rings, wherein a change in a current flowing through each of the coils produces vibration of each of the permanent magnet rings in proportion to the change in the current, which in turn drives the vibration shaft to vibrate in proportion.