Linear Motor Pole Structure Using Continuous Anisotropic Magnets
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Solution Overview
Problem
Conventional linear motors face challenges with increased part numbers and difficult assembly due to the need for multiple permanent magnets and yoke parts per pole, which are magnetized in repulsive directions.
Innovation Solution
The linear motor design incorporates polar anisotropic permanent magnets that are magnetized from end portions to a radial center, reducing the need for yoke parts between magnets and improving assembly by providing magnets in a continuous range along the axis, thus reducing the overall number of parts and enhancing assemblability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple permanent magnets and yoke parts are arranged per pole in conventional linear motors, then the magnetic field distribution can be controlled, but the number of parts increases and assembly becomes difficult
Solution Approach 1:
The patent combines multiple permanent magnets into a single continuous permanent magnet structure that spans across pole regions. This merging approach maintains the necessary magnetic field distribution while reducing the number of separate magnet components and eliminating the need for intermediate yoke parts between magnets, directly resolving the contradiction between magnetic field control and part reduction
2Reliability
If multiple permanent magnets and yoke parts are arranged per pole in conventional linear motors, then the magnetic field distribution can be controlled, but assembly difficulty increases
Solution Approach 1:
By merging multiple magnets into a continuous magnet structure, the patent reduces the number of assembly steps and eliminates the need to precisely position and secure multiple separate magnet components along with intermediate yoke parts, significantly improving ease of manufacture while preserving magnetic field distribution
Solution Approach 2:
The continuous permanent magnet is designed with internal segmentation or magnetization patterns that create distinct pole regions within a single unified structure, allowing controlled magnetic field distribution without requiring multiple separate physical magnet components, thus simplifying assembly
3Reliability
If permanent magnets are arranged in discrete sections with yoke parts between them, then magnetic pole control is achieved, but the overall number of parts increases
Solution Approach 1:
The patent merges discrete magnet sections into a continuous magnet structure where different regions are magnetized in opposite directions to create distinct poles. This approach maintains precise magnetic pole control while eliminating the need for separate yoke parts between magnets, directly reducing the total quantity of components
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 reduces the number of parts and improves assembly efficiency by eliminating the need for yoke parts between magnets and simplifying the assembly process, while maintaining motor performance.
Implementation Method 1
The permanent magnets are polar anisotropic magnets that are magnetized from both end portions along the first axis to a radial end portion at a center along the first axis
Data Source
AI summary
Disclosed is a linear motor which includes a stator and a mover. The stator extends along a first axis. The mover is arranged so as to extend along the first axis and radially face the stator. The mover has a pole interval along the first axis different from that of the stator. At least one of the stator and the mover has a plurality of permanent magnets arranged in alignment with each other along the first axis, and a plurality of yoke parts arranged in alignment with each other along the first axis. The permanent magnets are provided, for each pole, in a continuous range along the first axis. The permanent magnets are polar anisotropic magnets that are magnetized from both end portions along the first axis to a radial end portion at a center along the first axis, or magnetized in the reverse directions to these.