Rotating Vibration Actuator Weight Layout for Stable Resonance
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Solution Overview
Problem
Vibration actuators of cantilever type face challenges in increasing inertia while maintaining a suitable resonance point without increasing size, as larger magnets lead to magnetic saturation and decreased inertia.
Innovation Solution
A vibration actuator design featuring a movable body with a coil and core, where the core has protruding ends and a weight part fixed in a notch, supported by a shaft, allowing for reciprocal and rotational vibration without increasing size, utilizing a magnetic spring formed by magnets and a coil to enhance inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of the magnet is enlarged to increase magnetic fluxes, then magnetic characteristics are improved, but the dimension of the vibration actuator increases and inertia decreases
Solution Approach 1:
The weight part is nested within the coil structure, specifically positioned in the inner peripheral region of the coil. This allows the weight part to be contained within the existing actuator footprint without increasing overall dimensions, while still adding mass to increase inertia. The weight part is integrated into the movable body assembly, creating a compact configuration that solves the contradiction between maintaining small size and increasing inertia.
Solution Approach 2:
Instead of increasing magnet size in the radial or axial directions (which would increase actuator dimensions), the invention adds mass in the form of a weight part positioned within the existing structural envelope. This utilizes the available three-dimensional space efficiently, adding inertia without expanding the actuator's external dimensions, thus resolving the contradiction between size constraints and inertia requirements.
2Force
If the thickness of the magnet is increased to increase magnetic fluxes, then magnetic characteristics are improved, but the yoke becomes magnetically saturated and the resonance point increases
Solution Approach 1:
The invention separates the functions of magnetic flux generation and inertia provision. The magnet maintains its original thickness for optimal magnetic characteristics, while the weight part separately provides the necessary inertia. This segmentation allows each component to be optimized independently, preventing magnetic saturation while maintaining stable resonance characteristics.
Solution Approach 2:
The invention changes the approach from modifying magnet thickness to adding a separate weight component. By positioning the weight part within the coil structure, the system achieves the desired inertia without altering the magnetic circuit parameters, thereby maintaining stable resonance characteristics and avoiding magnetic saturation issues.
3Weight of moving object
If the size of the vibration actuator is increased to increase inertia, then inertia is improved, but the device size increases which is not acceptable
Solution Approach 1:
The weight part is nested within the existing actuator structure, specifically positioned in the inner peripheral region of the coil. This allows the addition of mass for increased inertia without increasing the external dimensions of the actuator. The weight part is integrated into the movable body assembly, creating a compact configuration that solves the contradiction between increasing inertia and maintaining small size.
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 increases inertia and generates suitable vibrations without size increments, maintaining magnetic characteristics and resonance point stability.
Implementation Method 1
a vibration actuator which include: a fixing body including a coil; and a movable body including a magnet, and which generate vibration by reciprocating the movable body by utilizing a driving force of a voice coil motor formed of the coil and the magnet
Implementation Method 2
utilizing a magnetic spring formed by magnets and a coil to enhance inertia
Data Source
AI summary
Provided is a vibration actuator including: a movable body including a coil and a core around which the coil is wound; a fixing body including a magnet; and a shaft part turnably supporting the movable body with respect to the fixing body on a side of the one end part of the core. The movable body reciprocatingly and rotationally vibrates around the shaft part with respect to the fixing body by cooperation between the coil to be energized and the magnet. The magnet is disposed to face the other end part of the core in an extending direction of the core when energization is not performed. The magnet includes two magnetic poles having different polarities and arranged in a reciprocating and rotational vibration direction. A weight part is disposed in a notch on a side of the other end part of the core or in the coil.