Linear Machine Primary Part End Tooth Modules Force Ripple
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Solution Overview
Problem
Linear electrical machines experience significant active and passive force ripple, leading to vibrations, unsteady running, and tracking errors due to magnetic interactions at the ends of the primary part, resulting in asymmetric induced voltages and power losses.
Innovation Solution
The primary part is enhanced with flux-guiding end tooth modules that include permanent magnets without windings, arranged to match the geometry of existing tooth modules, allowing for reduced force ripple by modifying the magnetization or size of the permanent magnets at the ends, which compensates for the latching forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the primary part has several active means for generating magnetic fields, then the machine can generate electromagnetic force, but significant active and passive force ripple occurs leading to vibrations and unsteady running
Solution Approach 1:
The primary part is segmented into multiple tooth modules, each containing permanent magnets and windings. This segmentation allows the magnetic field generation to be distributed across multiple identical units, which helps to balance and reduce the overall force ripple through the periodic arrangement of these segments along the linear path.
Solution Approach 2:
The patent applies different magnetic field generation approaches at different locations: permanent magnets are installed in all tooth modules including end tooth modules, while windings are only installed in intermediate tooth modules. This local differentiation optimizes the magnetic field distribution to reduce force ripple at critical end regions while maintaining power generation capability in the central region.
2Power
If the primary part has several active means for generating magnetic fields, then electromagnetic force is generated, but asymmetric induced voltages occur resulting in power losses
Solution Approach 1:
The primary part is divided into multiple identical tooth modules with consistent permanent magnet installation. This segmentation creates a more uniform magnetic field distribution along the linear path, which symmetrizes the induced voltages in the windings and reduces the asymmetric power losses that would otherwise occur at the ends of the primary part.
Solution Approach 2:
Permanent magnets are strategically installed in end tooth modules where they are needed to compensate for the lack of magnetic flux at the ends, while windings are positioned in intermediate modules where they can effectively convert the symmetrized magnetic field into electrical energy with minimal asymmetric losses.
3Object-generated harmful factors
If flux-guiding end tooth modules with permanent magnets are added, then force ripple is reduced, but the device complexity increases
Solution Approach 1:
The primary part is divided into standardized tooth modules that can be manufactured independently and assembled in sequence. The end tooth modules are identical in structure to intermediate modules, differing only in the absence of windings. This modular segmentation simplifies the overall design and manufacturing process while achieving force ripple reduction through the consistent permanent magnet arrangement across all modules.
4Power
If permanent magnets are installed in end tooth modules, then induced voltages are enhanced and force ripple is reduced, but manufacturing complexity increases
Solution Approach 1:
The primary part is constructed from multiple identical tooth modules that can be manufactured using the same tooling and processes. Each module contains permanent magnets installed in the same positions, allowing for standardized manufacturing procedures. The end modules are simply assembled without windings, maintaining ease of manufacture while achieving enhanced induced voltages through the continuous permanent magnet arrangement.
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 significantly reduces active and passive force ripple, enhances induced voltages, and improves motor operation by minimizing cogging forces, resulting in better synchronism, higher nominal force, and reduced electromagnetic asymmetries.
Implementation Method 1
a first means for generating a first magnetic field and a second means for generating a second magnetic field
Implementation Method 2
superimposition of the first magnetic Field with the second magnetic field is made possible
Implementation Method 3
By attaching flux-guiding elements, a reduction in the active and especially the passive force ripple
Implementation Method 4
The induced voltages in the winding-carrying end teeth of the primary part are increased
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a primary part (2) of a linear electric machine (1, 10, 20), wherein the primary part (2) comprises: - a first means for generating a first magnetic field, - a second means for generating a second magnetic field, - wherein the first means and the second means are arranged in such a way that a superposition of the first magnetic field with the second magnetic field is enabled, - wherein a flux-carrying element for reducing the force ripple is arranged on one and/or both end faces of the primary part (2).