Segmented Yoke Actuator Structure for Compact Vibration Mass
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing actuators that use magnetic and coil components to create vibration in a movable body face challenges in increasing the acceleration of vibration without increasing the size and cost of the device, which hinders miniaturization and affects vibration characteristics.
Innovation Solution
The actuator design incorporates a movable body with a first and second yoke, each composed of stacked inner and outer members, with connecting plate portions that are bonded together to increase the weight of the yoke without increasing its width, thus maintaining vibration space and avoiding cost increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the first yoke and the second yoke is increased to increase the weight of the movable body, then the acceleration of vibration is improved, but the height and width of the movable body increase, which is detrimental to miniaturization
Solution Approach 1:
The first yoke and second yoke are each divided into multiple segments (first through fourth yokes) that can be stacked and assembled together. This segmentation allows the weight of the movable body to be increased by adding more segments without necessarily increasing the overall dimensions, as the segments are arranged in a compact stacked configuration rather than requiring uniform thickness increases throughout the entire structure.
Solution Approach 2:
Instead of increasing weight by uniformly thickening the yokes in all dimensions, the invention increases weight by adding multiple thin yoke segments stacked in the thickness direction (one dimension) while keeping the width and length dimensions relatively small. This dimensional approach allows weight increase without proportional increases in overall volume, addressing the miniaturization requirement.
2Volume of moving object
If the gap between the first yoke and the second yoke is reduced to suppress the increase in height, then the space for the connecting body to be joined becomes narrower, which affects vibration characteristics
Solution Approach 1:
The yoke structure is segmented into multiple thin sections (first through fourth yokes) with connecting bodies positioned between them. This segmentation allows for optimized spacing - the gaps between segmented yokes can be sufficiently large to accommodate connecting bodies with appropriate thickness for maintaining vibration characteristics, while the overall height is controlled by the number and thickness of segments rather than requiring large uniform gaps.
Solution Approach 2:
Connecting bodies are introduced as intermediary elements between the yoke segments. These connecting bodies serve as mediators that require sufficient space to maintain proper vibration characteristics and connection reliability, while allowing the yoke segments to be arranged in a compact stacked configuration. The intermediaries enable the system to achieve both compact overall dimensions and adequate local spacing for proper function.
3Volume of moving object
If the gap between the connecting portions is narrowed to reduce the increase in width, then the space for the movable body to vibrate cannot be secured
Solution Approach 1:
The yoke structure is divided into multiple segments arranged in a stacked configuration, where the width of the movable body is determined by the width of individual thin segments rather than the thickness of thick uniform plates. This segmentation allows the connecting portions to be positioned at the edges of segments with adequate spacing for vibration, while the overall width remains compact due to the thin-profile segment design.
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
This configuration effectively increases the weight of the movable body while maintaining the vibration characteristics and preventing enlargement, thus supporting miniaturization and reducing costs.
Implementation Method 1
a magnetic drive circuit including a coil 10 and a magnet 7 facing the coil 10 in a first direction (Z1 direction or Z2 direction), the magnetic drive circuit causing the movable body 5 to vibrate in a second direction (X direction) intersecting the first direction
Data Source
AI summary
A movable body of an actuator includes a first yoke to which a first magnet facing a coil from a Z1 direction is fixed, and a second yoke to which a second magnet facing the coil from a Z2 direction is fixed. The portion of the first yoke to which the first magnet is fixed consists of two members: a first inner member and a first outer member. The portion of the second yoke to which the second magnet is fixed consists of two members: a second inner member and a second outer member. The portions surrounding both sides of the coil in the X direction bond first connecting plate portions of the first outer member and second connecting plate portions of the second outer member.