Magnetic Actuator Yoke Layout for Higher Thrust in Compact Travel
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Solution Overview
Problem
Existing actuators with magnetic drive mechanisms face challenges in maintaining a compact size when using larger coils, as the increased coil size requires larger yokes and a greater separation distance, leading to an overall increase in actuator dimensions.
Innovation Solution
The actuator design includes a magnetic drive mechanism with non-overlapping connection yokes and a coil holder structure that allows for a larger coil size without increasing the actuator's moving direction dimensions, by positioning the yokes to surround the coil and using cut-out parts to accommodate the yokes and prevent excessive separation, thereby maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a larger coil is used to increase thrust, then the thrust is improved, but the actuator size in the moving direction increases
Solution Approach 1:
The invention repositions the connection yokes from overlapping with the coil in the moving direction to being arranged side-by-side in the orthogonal direction. This dimensional rearrangement allows the coil to be enlarged in the orthogonal direction without increasing the actuator size in the moving direction, thereby maintaining compactness while enabling larger coil area for increased thrust.
Solution Approach 2:
The yoke is segmented into a coil holder portion and connection yoke portions. The connection yokes are separated from the coil holder and positioned at both ends in the orthogonal direction, allowing independent optimization of coil size and yoke positioning. This segmentation enables the coil to be enlarged without proportionally increasing the overall actuator length in the moving direction.
2Force
If the coil size is increased to improve thrust, then the thrust is improved, but the holding part size increases requiring greater yoke separation
Solution Approach 1:
The connection yokes are repositioned from a configuration where they overlap the coil in the moving direction to a configuration where they are arranged side-by-side in the orthogonal direction. This allows the coil holder to be enlarged in the orthogonal direction to accommodate larger coils without increasing the separation distance between connection yokes in the moving direction, thereby simplifying the overall structure.
3Force
If the facing area between coil and magnet is increased to obtain larger thrust, then the thrust is improved, but the actuator becomes larger in the moving direction
Solution Approach 1:
The invention enables enlargement of the coil's effective side portion in the orthogonal direction by repositioning the connection yokes to the sides in the orthogonal direction rather than overlapping the coil in the moving direction. This allows the facing area between coil and magnet to be increased through orthogonal expansion rather than longitudinal expansion, maintaining compact actuator size in the moving direction while achieving larger thrust.
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 design enables the actuator to maintain a stable size in the moving direction even with larger coils, ensuring efficient magnetic flux distribution and thrust generation without enlarging in the moving direction.
Implementation Method 1
a magnetic drive mechanism having a coil and a magnet to relatively move the movable body and the support body
Implementation Method 2
magnetic flux from the first magnet and magnetic flux from the second magnet flow so as to surround the coil according to a shape of the yoke
Data Source
AI summary
An actuator includes a support body, a movable body, a connection body, and a magnetic drive mechanism having a coil and a magnet for relatively moving the support body and the movable body. A winding part of the coil includes effective side portions, a first curved side portion connecting one side ends of the effective side portions, and a second curved side portion connecting the other side ends of the effective side portions. The magnet faces the effective side portions of the coil. A yoke fixed to the magnet includes a first yoke, a second yoke, a one side connection yoke and the other side connection yoke connecting the first yoke with the second yoke, and the one side connection yoke and the other side connection yoke are provided at positions so as not to overlap with the effective side portions and the magnet.