Rotor Magnet Layout Using Mixed Magnetic Force Magnets
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Solution Overview
Problem
The high cost of electric motors due to the use of high-priced magnets with strong magnetic force, which are necessary to achieve sufficient magnetic force, necessitates a reduction in the amount of these expensive magnets while maintaining magnetic performance.
Innovation Solution
A rotor design incorporating both high and low magnetic force permanent magnets, where the high magnetic force magnets form part of the outer peripheral surface and are supplemented by lower magnetic force magnets arranged in a ring-shaped configuration, allowing for a reduction in the amount of expensive magnets used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high magnetic force permanent magnets form the entire outer peripheral surface of the rotor, then sufficient magnetic force is obtained, but the cost of the rotor increases
Solution Approach 1:
The patent applies local quality by differentiating the magnetic properties of different regions on the rotor's outer peripheral surface. High magnetic force permanent magnets are strategically positioned at specific locations where stronger magnetic fields are needed, while low magnetic force permanent magnets are used in other regions. This spatial differentiation of magnetic quality allows the rotor to achieve sufficient overall magnetic force while reducing the quantity of expensive high magnetic force magnets, thereby resolving the contradiction between magnetic force and cost.
2Force
If high magnetic force permanent magnets form the entire outer peripheral surface of the rotor, then magnetic force is enhanced, but the amount of expensive magnets increases
Solution Approach 1:
The patent implements local quality by creating non-uniform magnetic force distribution across the rotor's outer peripheral surface. High magnetic force permanent magnets are placed in specific local regions where enhanced magnetic force is critical for motor performance, while low magnetic force permanent magnets are used in regions where lower magnetic force is acceptable. This localized optimization reduces the total amount of expensive high magnetic force magnets required while maintaining sufficient overall magnetic force for the rotor to function effectively.
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 achieves sufficient magnetic force and induced voltage while reducing the cost of the rotor by approximately 20% through the strategic placement and arrangement of magnets, maintaining efficiency and accuracy of rotation control.
Implementation Method 1
permanent magnets having high magnetic force form the entire outer peripheral surface of the rotor
Implementation Method 2
magnetic force of the rotor can be effectively enhanced
Data Source
AI summary
A rotor includes at least one first permanent magnet and at least one second permanent magnet. The at least one first permanent magnet forms part of an outer peripheral surface of the rotor and is magnetized to have polar anisotropy. The at least one second permanent magnet is adjacent to the at least one first permanent magnet in a circumferential direction of the rotor and has lower magnetic force than magnetic force of the at least one first permanent magnet.