Rotor Magnetic Barrier Layout for Saturation-Resistant Motors
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Solution Overview
Problem
Current clothing treating devices face performance limitations due to cross-axis armature reaction and magnetic saturation in electric motors, which are exacerbated by non-magnetically conductive materials entering the magnetic barrier during rotor injection molding, affecting uniformity and efficiency.
Innovation Solution
A rotor structure with a magnetic barrier positioned on the rotor iron core, comprising permanent magnet slots and rotor punching sheets, where the magnetic barrier is strategically placed to alleviate magnetic saturation and enhance torque density and overload capacity, while reducing the need for rare-earth permanent magnets and minimizing the entry of non-magnetically conductive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic barrier is configured to solve performance problems, then the cross-axis armature reaction is suppressed and magnetic saturation is alleviated, but non-magnetically conductive materials may enter the magnetic barrier during rotor injection molding, affecting uniformity
Solution Approach 1:
The patent introduces a magnetic barrier as an intermediary component between the permanent magnet and the rotor iron core. This magnetic barrier serves as a mediator that suppresses cross-axis armature reaction while preventing non-magnetically conductive materials from directly entering critical magnetic paths, thus resolving the contradiction between improving magnetic performance and maintaining manufacturing uniformity
Solution Approach 2:
The magnetic barrier is strategically positioned only in specific regions where cross-axis armature reaction is most severe, rather than uniformly throughout the entire rotor. This localized approach improves magnetic performance where needed while minimizing interference with the injection molding process and reducing the risk of material contamination
2Ease of manufacture
If the amount of permanent magnet is reduced to lower production costs, then production cost decreases, but the power density and torque density of the electric motor may be affected
Solution Approach 1:
The patent extracts the function of suppressing cross-axis armature reaction from the permanent magnet material itself and transfers it to a separate magnetic barrier component. This allows the permanent magnet to be optimized for its primary function of generating magnetic flux, while the magnetic barrier handles the suppression function, enabling cost reduction through reduced permanent magnet usage without sacrificing power density
Solution Approach 2:
The patent employs a composite structure combining permanent magnet material with magnetic barrier material. This composite approach allows each material to be optimized for its specific function - the permanent magnet for generating strong magnetic fields and the magnetic barrier for suppressing cross-axis armature reaction - achieving both cost efficiency and high power density
3Reliability
If the magnetic barrier is provided on all rotor punching sheets, then magnetic performance is optimized, but the complexity of rotor assembly and the risk of material contamination during injection molding increase
Solution Approach 1:
The patent applies partial action by providing magnetic barriers on only selected rotor punching sheets rather than all of them. Specifically, magnetic barriers are installed on punching sheets where cross-axis armature reaction is most severe, while omitting them from other areas. This partial approach achieves sufficient magnetic performance optimization while significantly reducing assembly complexity and minimizing the risk of non-magnetically conductive material contamination during injection molding
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 solution effectively inhibits cross-axis armature reaction, reduces magnetic saturation, and improves torque density and overload capacity, while maintaining cost-effectiveness and product competitiveness by optimizing the placement and design of the magnetic barrier within the rotor structure.
Implementation Method 1
the extending directions of the two ends of the magnetic barrier face the permanent magnet and the outer edge respectively
Implementation Method 2
under the action of the permanent magnet, the rotor structure can rotate with respect to a stator
Implementation Method 3
the rotor structure is capable of rotating unidirectionally or bidirectionally along a circumferential direction
Data Source
AI summary
A rotor structure, an electric motor structure and a clothing treating device are provided. The rotor structure includes a rotor iron core, a permanent magnet and a magnetic barrier. The rotor iron core includes rotor punching sheets arranged in a stacked manner. Permanent magnet slots are provided in the rotor iron core and the permanent magnet is disposed in the permanent magnet slots. The rotor structure rotates in one direction or two directions in a circumferential direction. In the rotation direction of the rotor structure, the magnetic barrier is provided on at least one side of the permanent magnet slot, and two ends of the magnetic barrier face an outer edge of the permanent magnet and an outer edge of the rotor iron core, respectively. The magnetic barrier is provided on a first punching sheet or a second punching sheet of the rotor punching sheets.