Electric Machine Winding Insulation Layout With Variable Thickness
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Solution Overview
Problem
Current insulation systems for electric motors in electric vehicles apply uniform insulation thickness, leading to over-insulation and excessive material usage, increasing costs and thermal resistance, which reduces thermal efficiency.
Innovation Solution
An adaptive insulation system with varying insulation thickness for different winding types, where the first insulation section has a uniform thickness and the second insulation section has a greater thickness, arranged circumferentially to optimize material usage and reduce thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform insulation thickness is applied to all conductors, then insulation reliability is improved, but material cost and thermal resistance increase
Solution Approach 1:
The patent applies different insulation thicknesses to different conductor types based on their specific voltage requirements. High voltage conductors receive thicker insulation (first insulation layer) while low voltage conductors receive thinner insulation (second insulation layer), optimizing material usage while maintaining adequate insulation reliability for each conductor type.
2Reliability
If uniform insulation thickness is applied to all conductors, then insulation reliability is improved, but thermal efficiency deteriorates
Solution Approach 1:
The patent reduces insulation thickness for low voltage conductors where thick insulation is not required for reliability, thereby reducing thermal resistance in those areas. This local optimization allows heat to dissipate more efficiently from conductors that do not require thick insulation for electrical safety.
3Reliability
If greater insulation thickness is applied, then insulation reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies thick insulation only to high voltage conductors where it is necessary for safety and reliability, while using thinner insulation for low voltage conductors. This selective approach reduces the total amount of expensive insulation material required, thereby reducing manufacturing costs while maintaining adequate protection.
4Reliability
If greater insulation thickness is applied, then insulation reliability is improved, but thermal resistance increases
Solution Approach 1:
The patent minimizes insulation thickness where high voltage stress is absent, reducing thermal resistance in those regions. By concentrating thick insulation only where electrically necessary and using thinner insulation elsewhere, the overall thermal path resistance is reduced while maintaining electrical reliability.
Data Source
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AI summary
An insulation system (10) configured for use in an electric machine (100) includes at least one first insulation section (20) including at least one first insulation element (22), the first insulation element being configured to be applied to at least a portion of a first winding type (112) of a plurality of windings (110), and the first insulation element having a first insulation thickness, and at least one second insulation section (40) including at least one second insulation element (42), the second insulation element being configured to be applied to at least a portion of a second winding type (114) of the plurality of windings, and the second insulation element having a second insulation thickness greater than the first insulation thickness of the first insulation element, wherein the first insulation section is arranged adjacent the second insulation section in a circumferential direction.