Segmented Magnetization Ring for Narrow-Gap Rotor Magnetizing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The narrow gap between the stator and rotor in permanent magnet embedded type motors makes it difficult to efficiently magnetize permanent magnets using existing methods, requiring complex operations.
Innovation Solution
A magnetization ring with magnetic and nonmagnetic portions is disposed between the rotor and stator, allowing efficient magnetization by guiding magnetic flux to the permanent magnet while suppressing short-circuit flux, facilitating easy handling and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a strip having magnetism is inserted between the stator and rotor to efficiently magnetize the permanent magnet, then magnetization efficiency is improved, but the operation becomes complex due to the narrow gap of 0.25 to 1.5 mm making it difficult to insert the strip
Solution Approach 1:
The magnetization ring is divided into multiple segments: magnetic portions (facing the permanent magnets) and nonmagnetic portions (facing the inter-pole portions). This segmentation allows the ring to guide magnetic flux efficiently to the permanent magnets while preventing flux short-circuiting through the nonmagnetic portions, achieving effective magnetization without complex insertion operations
Solution Approach 2:
The magnetization ring acts as an intermediary component disposed between the stator and rotor. It mediates the magnetic flux path by providing magnetic portions that conduct flux to the permanent magnets and nonmagnetic portions that block flux short-circuiting paths, thereby enabling efficient magnetization through a simple structural addition rather than complex operations
2Volume of moving object
If the gap between stator and rotor is reduced to improve motor compactness, then device size is reduced, but magnetization becomes more difficult due to the narrow gap
Solution Approach 1:
The magnetization ring applies local quality by having different magnetic properties in different regions: magnetic portions with high permeability facing the permanent magnets to concentrate and guide flux, and nonmagnetic portions facing the inter-pole portions to prevent flux leakage. This localized differentiation enables effective magnetization even in the reduced gap space
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
The magnetization ring enables efficient magnetization of permanent magnets with reduced magnetization current and enhanced magnetic force, simplifying the process and preventing flux short-circuiting.
Implementation Method 1
magnetization magnetic flux from the core portion can efficiently flow to the permanent magnet
Implementation Method 2
since the nonmagnetic portion of the magnetization ring faces the inter-pole portion, short-circuit of the magnetization magnetic flux can be suppressed
Implementation Method 3
magnetizing the permanent magnet by applying current to a coil wound on the core portion
Data Source
AI summary
A magnetization ring is disposed between a rotor and a core portion surrounding the rotor, the rotor having permanent magnets and inter-pole portions which are arranged in a circumferential direction about an axis. The magnetization ring has a magnetic portion facing the center of the permanent magnet in the circumferential direction, and a nonmagnetic portion facing the inter-pole portion of the rotor.