Axial Gap Rotor Yoke Recesses to Prevent Magnetic Short-Circuiting
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Solution Overview
Problem
Conventional axial gap motors experience reduced output torque due to magnetic short-circuiting between the rotor yoke and magnets, which decreases magnetic flux linkage.
Innovation Solution
The design incorporates recesses on the rotor yoke surface between facing areas, increasing magnetic resistance and preventing short-circuiting, allowing for enhanced magnetic flux linkage and increased output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rotor yoke surface is made flat and contacts the magnets directly, then the structure is simple and easy to manufacture, but magnetic short-circuiting occurs between the rotor yoke and magnets, reducing magnetic flux linkage and output torque
Solution Approach 1:
The rotor yoke surface is designed with different local properties: facing areas with flat surfaces for magnet contact and non-facing areas with recesses for magnetic isolation. This local differentiation prevents magnetic short-circuiting in the non-facing areas while maintaining simple manufacturing in the facing areas, thereby resolving the contradiction between ease of manufacture and output torque.
Solution Approach 2:
The rotor yoke surface is segmented into multiple facing areas and non-facing areas with recesses. This segmentation isolates the magnetic flux paths, preventing short-circuiting between adjacent magnets while maintaining structural simplicity, thus improving output torque without significantly complicating manufacturing.
2Power
If recesses are added to the rotor yoke surface to prevent magnetic short-circuiting, then magnetic flux linkage and output torque increase, but the structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The recesses are localized only in the non-facing areas of the rotor yoke surface, while the facing areas remain flat for simple magnet contact. This localized approach prevents magnetic short-circuiting where needed without adding complexity to the entire rotor structure, thereby improving output torque with minimal increase in device complexity.
3Power
If recesses are added to the rotor yoke surface to prevent magnetic short-circuiting, then magnetic flux linkage and output torque increase, but manufacturing precision requirements increase
Solution Approach 1:
The flat facing areas maintain simple manufacturing requirements for precise magnet alignment, while the recesses in non-facing areas have relaxed precision requirements as they primarily serve magnetic isolation functions. This differentiation allows the critical facing areas to meet precision requirements without overly complicating the manufacturing of the recessed areas, thus improving output torque with manageable precision requirements.
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 recesses on the rotor yoke surface effectively inhibit magnetic short-circuiting, resulting in a higher magnetic flux linkage and increased output torque compared to conventional designs.
Implementation Method 1
The recesses on the rotor yoke surface effectively inhibit magnetic short-circuiting, resulting in a higher magnetic flux linkage
Implementation Method 2
The recesses on the rotor yoke surface effectively inhibit magnetic short-circuiting, resulting in a higher magnetic flux linkage
Data Source
AI summary
This axial gap motor includes: a stator; and a rotor provided so as to be opposed to the stator in an axial direction. The rotor includes an annular rotor yoke, and a plurality of magnets provided to contact one surface of the rotor yoke so as to be arranged at predetermined intervals along a circumferential direction with magnetic poles thereof being different alternately. The one surface includes a plurality of facing areas facing and contacting the plurality of magnets, and a non-facing area not facing the plurality of magnets. The non-facing area includes partial areas each located between a pair of the facing areas adjacent to each other in the circumferential direction among the plurality of facing areas. The partial areas are formed to be recesses recessed in the axial direction relative to the facing areas.