High-Frequency Rotor Magnet Layout to Reduce Iron Core Stress
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Solution Overview
Problem
High-frequency rotary motor rotors experience stress concentration and deformation due to centrifugal forces from large permanent magnets, leading to potential damage to the iron core.
Innovation Solution
A high-frequency rotary mechanism with an odd number of permanent magnets disposed in each pole, where adjacent magnets are separated by a repulsive distance, reducing the need for position limiting structures and dispersing centrifugal forces using multiple small-volume magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If large volume permanent magnets are disposed in each pole of the rotor, then the electromagnetic characteristics are improved, but the centrifugal force causes stress concentration on the rotor iron core leading to deformation or damage
Solution Approach 1:
The patent divides each magnetic pole into multiple permanent magnets (at least three per pole) arranged in series along the radial direction. This segmentation reduces the volume and mass of each individual magnet while maintaining the total magnetic strength, thereby reducing centrifugal force and stress concentration on the rotor iron core during high-speed rotation.
Solution Approach 2:
The patent creates different local structures within each magnetic pole by arranging multiple permanent magnets with alternating polarity orientations. The adjacent ends of permanent magnets are positioned to maintain a repulsion distance without direct contact, creating localized stress distribution patterns that reduce overall stress concentration on the rotor core.
2Stability of the object's composition
If position limiting structures are added to maintain relative positions of permanent magnets, then the structural stability is improved, but the complexity of the rotor structure increases and centrifugal force still acts on these supporting structures
Solution Approach 1:
The patent utilizes the inherent magnetic repulsion force between adjacent permanent magnets with the same polarity at their adjacent ends to automatically maintain their relative positions. This self-positioning mechanism eliminates the need for additional mechanical position limiting structures, reducing structural complexity while maintaining stability during high-speed rotation.
Solution Approach 2:
The patent replaces mechanical position limiting structures with magnetic field-based positioning. The repulsive magnetic force between adjacent permanent magnets serves as the positioning mechanism, substituting mechanical constraints with electromagnetic forces that are more suitable for high-speed rotation applications.
3Object-affected harmful factors
If the number of permanent magnets per pole is increased, then the centrifugal force effect is dispersed, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The patent segments each magnetic pole into multiple standardized permanent magnets that can be manufactured independently and then assembled into magnetic sets. This standardization facilitates mass production and simplifies assembly processes while achieving the goal of dispersing centrifugal force effects through multiple smaller magnets.
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 stress on the rotor iron core, minimizing the risk of deformation and damage while maintaining optimal electromagnetic characteristics and structural rigidity.
Implementation Method 1
adjacent ends of the permanent magnets located on two sides are made as a same magnetic pole, so that the adjacent ends are separated without directly abutting against each other by a repulsion distance under a repulsive effect of the same pole
Implementation Method 2
using a large number of the dispersed permanent magnets with small volume and mass to disperse an effect of centrifugal force
Data Source
AI summary
In an improved structure of high-frequency rotary mechanism, permanent magnets with an odd number of at least five are disposed in each pole of a motor rotor, one of the permanent magnets serves as a center, the other permanent magnets are symmetrically connected in series on two sides of the center, and adjacent ends of the permanent magnets located on two sides are made as a same magnetic pole, so that the adjacent ends are separated without directly abutting against each other by a repulsion distance under a repulsive effect of the same pole, relative positions between the adjacent permanent magnets are maintained by the repulsive effect, and structures of position limiting and support in the prior art for positioning are not required, thereby avoiding centrifugal force of high-speed rotation to act on the structures of position limiting and support, and reducing negative impact on a rotor iron core.