Linear Motor Guide Layout for Stable Scanner Position Accuracy
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Solution Overview
Problem
Conventional three-dimensional scanners and medical care apparatuses using linear motors face issues with measurement and driving accuracy due to variations in the inclination of components, which can be influenced by the driving situation of the motor, leading to potential inaccuracies in data collection and tool operation.
Innovation Solution
A linear motor design featuring a movable element with a permanent magnet and a stator coil, supported by two parallel linear guides with asymmetrical placement of the permanent magnet relative to holding portions, minimizing the impact of assembly errors and ensuring consistent orientation regardless of the driving situation.
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 manufacture is improved, but the movable element may become inclined and measurement precision deteriorates
Solution Approach 1:
The permanent magnet is positioned asymmetrically with respect to the holding portions, creating an inherent stabilizing effect that prevents inclination of the movable element. This asymmetric positioning generates a restoring moment that counteracts any inclination caused by play in the support and holding portions, thereby maintaining measurement precision while preserving the ease of manufacture benefits from the fitted play design.
2Manufacturing precision
If play is provided between support portions and holding portions to accommodate assembly variations, then manufacturing tolerance is improved, but driving accuracy deteriorates due to varying inclination
Solution Approach 1:
The asymmetric positioning of the permanent magnet relative to the holding portions creates a stabilizing mechanism that maintains consistent orientation of the movable element during operation. This ensures that driving accuracy remains reliable even when play is provided to accommodate manufacturing tolerances in the support and holding portions.
3Ease of operation
If the movable element is allowed to move freely with play in support portions, then ease of operation is improved, but the inclination varies depending on driving situation leading to accuracy deterioration
Solution Approach 1:
The asymmetric positioning of the permanent magnet creates a self-stabilizing effect that maintains consistent inclination of the movable element regardless of the driving situation. This allows the movable element to move freely with play in the support portions for ease of operation, while the asymmetric magnet positioning prevents inclination variations that would otherwise deteriorate measurement precision.
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 maintains measurement and driving accuracy by stabilizing the movable element's inclination, ensuring high precision in data collection and tool operation, even under varying motor conditions.
Implementation Method 1
a movable element 190 including a permanent magnet 53; a stator 51 including a coil 52 positioned to face the permanent magnet 53
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A linear motor is provided 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 moves linearly and includes: a movable element including a permanent magnet (53); a stator including a coil (52) positioned to face the permanent magnet (53); and two parallel linear guides configured to guide the movable element to move linearly. Support portions (180) provided on the linear guides, respectively, and holding portions provided on the movable element to correspond to the support portions (180) are fitted with play and thereby the movable element is attached to the linear guides. A position where the permanent magnet (53) is attached to the movable element is asymmetrical with respect to each of the holding portions.