Linear Motor Assembly with Asymmetric Magnet for Stable Lens Alignment
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Solution Overview
Problem
Conventional three-dimensional scanners and medical care apparatuses using linear motors face accuracy issues due to assembly errors and varying lens inclination during operation, affecting measurement and driving precision.
Innovation Solution
A linear motor design with a movable element, permanent magnet, and stator, featuring asymmetrical placement of the permanent magnet relative to holding portions, and parallel linear guides with fitted support and holding portions to minimize assembly errors and maintain consistent orientation, ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If support portions and holding portions are fitted with play to minimize assembly errors, then ease of assembly is improved, but lens inclination varies depending on driving situation causing measurement accuracy deterioration
Solution Approach 1:
The permanent magnet is positioned asymmetrically with respect to the holding portions, creating a consistent magnetic bias that maintains a fixed inclination angle of the lens relative to the support portions. This asymmetric positioning ensures that the lens inclination remains constant regardless of the driving situation, thereby maintaining measurement accuracy while preserving the play-fit assembly structure.
2Stability of the object's composition
If permanent magnet is positioned symmetrically, then structural balance is improved, but lens inclination varies with driving situation
Solution Approach 1:
The permanent magnet is deliberately positioned asymmetrically relative to the holding portions, creating a controlled magnetic bias that maintains a fixed lens inclination. This asymmetric configuration sacrifices perfect structural symmetry to achieve consistent lens orientation, ensuring measurement accuracy remains stable throughout the driving cycle.
3Ease of operation
If linear guides are used to guide linear movement, then ease of operation is improved, but assembly errors affect measurement accuracy
Solution Approach 1:
The play is intentionally designed into the fitting between support portions and holding portions during assembly, creating preliminary clearance that compensates for assembly errors. This preliminary action allows the components to self-align within the play range, minimizing the impact of assembly errors on measurement accuracy while maintaining smooth linear movement through the linear guides.
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 enhances measurement accuracy and driving precision by maintaining consistent lens orientation, reducing the impact of assembly errors and operational variations, thereby improving the reliability of three-dimensional shape data acquisition and tool operation.
Implementation Method 1
a movable element (190) including a permanent magnet (53); a stator (51, 52) including a coil (52) positioned to face the permanent magnet (53)
Data Source
AI summary
The present disclosure provides a linear motor that undergoes no deterioration of the measurement accuracy or the driving accuracy depending on a driving situation, and a medical care apparatus including the linear motor. The linear motor of the present disclosure is a linear motor that moves linearly, the linear motor including: a movable element including a permanent magnet; a stator including a coil positioned to face the permanent magnet; and two parallel linear guides configured to guide the movable element to move linearly. Support portions provided on the linear guides, respectively, and holding portions provided on the movable element to correspond to the support portions are fitted with play and thereby the movable element is attached to the linear guides. A position where the permanent magnet is attached to the movable element is asymmetrical with respect to each of the holding portions.