Linear Motor Marginal Tooth Layout for Smooth Transition Thrust
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Solution Overview
Problem
In multi-carrier transport systems, tooth pitch errors at transitions between linear motors lead to magnetic discontinuities and reduced drive force due to tolerances, assembly gaps, and space requirements, resulting in an inhomogeneous magnetic field and difficult controllability.
Innovation Solution
The linear motor design includes marginal teeth inclined relative to other teeth, allowing for a variable tooth pitch that optimizes the spacing between adjacent marginal teeth, reducing tooth pitch errors and enhancing the magnetic field homogeneity by adjusting the tooth base spacing and forming angles, thereby maximizing thrust force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard teeth spacing is used in linear motors, then manufacturing is simplified, but tooth pitch errors occur at transitions leading to magnetic discontinuities and reduced drive force
Solution Approach 1:
The patent applies local quality by making only the marginal teeth (first and last teeth of each linear motor) inclined while keeping the intermediate teeth straight and uniformly spaced. This localized modification to specific teeth at transition zones corrects tooth pitch errors and ensures magnetic field continuity without requiring changes to the entire teeth structure, thus maintaining manufacturing simplicity while improving reliability.
2Reliability
If marginal teeth are inclined to correct tooth pitch errors, then magnetic field homogeneity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent limits the complexity increase by applying the inclined geometry only to marginal teeth rather than all teeth. The intermediate teeth remain uniformly spaced and vertically aligned, maintaining simple manufacturing. The inclination angle is specifically designed to compensate for tooth pitch errors at transitions, achieving magnetic field homogeneity with minimal geometric variation.
Solution Approach 2:
The patent changes the geometric parameter (inclination angle) of marginal teeth to optimize the tooth pitch at transitions. By adjusting this specific parameter for marginal teeth only, the patent achieves continuous magnetic field homogeneity without requiring complex modifications to the entire teeth structure or intermediate teeth.
3Force
If tooth pitch is optimized at transitions, then drive force is maximized, but manufacturing precision requirements increase
Solution Approach 1:
The patent focuses precision requirements only on marginal teeth positioning and inclination rather than requiring high precision across all teeth. The intermediate teeth can be manufactured with standard tolerances and uniform spacing, while the marginal teeth receive the specialized inclined geometry to optimize tooth pitch at transitions, thereby maximizing drive force with localized precision requirements.
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 achieves a homogeneous magnetic field and optimized thrust force at transitions between linear motors, improving the controllability and flexibility of the transport system by minimizing tooth pitch errors and allowing for a more compact installation.
Implementation Method 1
The drive coils are configured to cooperate with drive magnets of a transport element to bring about a drive force for moving the transport element along a guide track
Implementation Method 2
at least one of the marginal teeth is inclined with respect to the other teeth... achieves a homogeneous magnetic field and optimized thrust force at transitions between linear motors
Data Source
AI summary
A linear motor for a transport system, in particular for a multi-carrier system, has a yoke comprising a plurality of teeth arranged after one another and a plurality of drive coils arranged at the teeth. The drive coils are configured to cooperate with drive magnets of a transport element to bring about a drive force for moving the transport element along a guide track of the transport system. The teeth have marginal teeth arranged at the two ends of the yoke. At least one of the marginal teeth is inclined with respect to the other teeth.