Moving Magnet Vibration Assembly for Better Centering Control
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Solution Overview
Problem
Existing X-direction vibration motors suffer from poor centering effects and prolonged inertial vibrations, leading to suboptimal user experience due to excessive offset vibrations and prolonged vibration after power-off.
Innovation Solution
A vibration apparatus comprising a counterweight block with a first magnet group and an elastic member, suspended within a stator assembly featuring a coil and a second magnet group, where the first magnet group's side magnets are perpendicular to the coil plane and the second magnet group's magnetization is parallel, creating symmetrical attractions to center the vibration assembly and reduce inertial vibration duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional vibration motor structure is used, then the device is simple, but the centering effect of the vibrator is poor and offset vibration is excessive
Solution Approach 1:
The magnet group is segmented into two distinct parts: a first magnet group fixed on the vibrator and a second magnet group fixed on the stator. This segmentation allows independent optimization of each magnet group's function, with the first magnet group generating vibration and the second magnet group providing centering force, thereby improving centering effect without excessive complexity
Solution Approach 2:
The patent introduces a new dimension of magnetic interaction by placing magnets on both the vibrator and stator, creating a three-dimensional magnetic field configuration. The first magnet group's magnetic field interacts with the second magnet group's magnetic field in multiple directions, enabling improved centering control through dimensional magnetic field distribution
2Duration of action of moving object
If a conventional vibration motor is used, then the structure is simple, but inertial vibration lasts a long time after power-off
Solution Approach 1:
The second magnet group on the stator is positioned and magnetized to create a preliminary opposing magnetic force that acts against the vibrator's motion. When the vibrator moves, the second magnet group generates a counteracting magnetic field that opposes the inertial motion, thereby reducing the duration of inertial vibration after power-off
Solution Approach 2:
The patent converts the harmful effect of strong magnetic attraction (which causes prolonged inertial vibration) into a beneficial centering force. By strategically positioning the second magnet group, the magnetic field that would otherwise extend vibration duration is transformed into a centering effect that stabilizes the vibrator at its equilibrium position, reducing unwanted oscillations
3Manufacturing precision
If the magnet group is positioned to improve centering, then centering effect improves, but the device structure becomes more complex
Solution Approach 1:
The first magnet group serves multiple functions: it generates the primary vibration force and simultaneously interacts with the second magnet group to provide self-centering capability. This multi-functionality reduces the need for additional dedicated centering mechanisms, thereby improving positioning accuracy without proportionally increasing device complexity
Solution Approach 2:
The magnetic field acts as an intermediary between the first and second magnet groups, enabling indirect interaction and force transmission. This intermediary mechanism allows precise control of vibrator positioning through magnetic field distribution rather than direct mechanical constraints, achieving high positioning accuracy with relatively simple magnet arrangement
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 enhances centering effects and vibration performance, shortening inertial vibration time and improving user experience by utilizing symmetrical magnetic attractions and elastic damping to stabilize the vibration assembly.
Implementation Method 1
a magnetization direction of the second magnet group is parallel to the plane on which the coil is located, and two poles of the second magnet group and magnetic poles of the two side magnets adjacent to the coil are attracted to each other respectively
Implementation Method 2
the vibration assembly is suspended in the vibration apparatus through the elastic member
Data Source
AI summary
A vibration apparatus comprising: a vibration assembly comprising a counterweight block, a first magnet group and an elastic member, the first magnet group is fixed on the counterweight block, the vibration assembly is suspended in the vibration apparatus through the elastic member; a stator assembly comprising a coil and a second magnet group, the second magnet group is installed in a winding hole of the coil; the first magnet group comprises at least two side magnets, magnetization directions of the two side magnets are perpendicular to a plane on which the coil is located, the side magnets are magnetized in opposite directions, a magnetization direction of the second magnet group is parallel to the plane, two poles of second magnet group are respectively attracted to poles of side magnets adjacent to the coil, the vibration assembly is configured to produce vibration relative to the stator assembly.