Magnetic Geared Machine Cooling With Independent Radial Gas Paths
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Solution Overview
Problem
Existing magnetic geared electrical machines face challenges in cooling design due to unequal heat generation and dissipation across the stator-side and rotor-side regions, with conventional cooling medium flow paths failing to account for these differences.
Innovation Solution
The magnetic geared electrical machine incorporates independent cooling gas flows through radial gaps between the stator and first rotor, and between the first and second rotors, facilitated by partition members such as baffle plates or labyrinth seals, allowing separate cooling gas paths for each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling medium flow paths are formed between circumferentially arranged pole pieces, then cooling can be provided to the electromagnetic steel magnetic path members, but cooling design that takes into account the amount of heat generated or dissipated in each region on both sides of the pole pieces is impossible
Solution Approach 1:
The cooling system is segmented into multiple independent flow paths: a first cooling medium flow path for cooling the stator and a second cooling medium flow path for cooling the rotor. This segmentation allows each region to be cooled independently according to its specific heat generation characteristics, resolving the contradiction between providing cooling and enabling flexible cooling design.
Solution Approach 2:
Different cooling strategies are applied to different regions: the stator region receives cooling through one flow path while the rotor region receives cooling through another flow path. This local differentiation allows the cooling design to adapt to the varying heat generation and dissipation characteristics of each region, achieving both effective cooling and design flexibility.
2Device complexity
If a single cooling system is used for both stator and rotor regions, then the structure is simplified, but the cooling design cannot account for unequal heat generation and dissipation in each region
Solution Approach 1:
The cooling system is divided into separate flow paths for the stator and rotor regions. Each flow path can be independently designed and controlled, allowing the system to account for unequal heat generation and dissipation in each region while maintaining manageable structural complexity through modular design.
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 enables tailored cooling based on the heat generation and dissipation in each region, improving cooling efficiency and flexibility by allowing independent control of cooling gas flows and temperatures.
Implementation Method 1
as a countermeasure against heat generation due to copper loss in the stator coils or iron loss in the pole pieces, each part of the magnetic geared electrical machine is cooled as appropriate
Implementation Method 2
cooling medium flow path is disposed between electromagnetic steel magnetic path members (pole pieces) arranged in the circumferential direction
Data Source
AI summary
A magnetic geared electrical machine includes: a stator including a stator coil; a first rotor including a plurality of pole pieces; a second rotor including a plurality of rotor magnets, and arranged opposite to the stator across the first rotor in a radial direction; a housing having a first inlet opening and a second inlet opening, and supporting the stator; a first inlet cavity defined by at least the housing so as to communicate with the first inlet opening provided in the housing and with a first radial gap between the stator and the first rotor; and a second inlet cavity defined by at least the housing so as to communicate with the second inlet opening provided in the housing and with a second radial gap between the first rotor and the second rotor.