Rotor Core Cooling Passage Layout for Magnet Heat and Rigidity
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Solution Overview
Problem
Large cavities in rotor cores for cooling permanent magnets compromise the rigidity of the rotor core, making it difficult to effectively cool the magnets while maintaining structural integrity.
Innovation Solution
The rotor core design includes asymmetrically shaped first hole portions between magnet holes, allowing for differential cooling of magnets while maintaining rigidity by varying the size and shape of the cooling passages to match the cooling needs of each magnet, with oil flowing through these passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cavity size is increased to improve cooling of permanent magnets, then cooling efficiency is improved, but rotor core rigidity deteriorates
Solution Approach 1:
The patent applies asymmetry by providing a first hole portion with an asymmetric shape across a first virtual line passing through the center between a pair of first magnet holes. This asymmetric design allows differential cooling of magnets on opposite sides while maintaining structural rigidity, resolving the contradiction between cooling efficiency and rigidity preservation
2Temperature
If the cavity size is increased to enhance cooling capability, then cooling effectiveness is improved, but rotor core structural integrity deteriorates
Solution Approach 1:
The patent applies local quality by providing asymmetric hole portions that create different cooling conditions for magnets on opposite sides of the rotor core. The first hole portion has different dimensions on either side of the first virtual line, allowing localized cooling optimization without requiring a large overall cavity, thus maintaining structural integrity while improving cooling effectiveness
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 effectively cools the magnets while preserving the rotor core's rigidity, ensuring efficient operation and structural stability.
Implementation Method 1
cause a refrigerant such as oil to flow into the cavity of the rotor core as described above for the purpose of cooling the permanent magnet
Data Source
AI summary
One aspect of a rotor core of the present invention is a rotor core of a rotor rotatable around a central axis, the rotor core including a pair of first magnet holes adjacent to each other in a circumferential direction, and a first hole portion located between a pair of the first magnet holes in the circumferential direction. A pair of the first magnet holes extend in directions away from each other in the circumferential direction from the inner side in a radial direction toward the outer side in the radial direction when viewed in an axial direction. The first hole portion is provided at a position overlapping a first virtual line passing through the center in the circumferential direction between a pair of the first magnet holes and extending in the radial direction when viewed in the axial direction, and has an asymmetric shape across the first virtual line.