Armature Joint Insulation Using Expandable Sheet-Wrapped Connections
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Solution Overview
Problem
The existing armature designs face challenges in easily forming insulating members for joint portions, as resin-based insulators are difficult to manufacture, leading to inefficiencies in insulation and space utilization within the armature slots.
Innovation Solution
The armature incorporates a sheet-shaped insulating member that can be easily formed by bending, covering facing surfaces and extending circumferentially to insulate joint portions, allowing for expansion and contraction, and increasing the space factor within the slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin-based insulating members are used to insulate joint portions, then insulation effectiveness is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent applies this principle by using a sheet-shaped insulating member that can be easily bent and formed to wrap around joint portions. The flexible sheet structure allows simple manufacturing through bending and shaping operations, while still providing effective insulation between adjacent joint portions in the radial direction.
Solution Approach 2:
The patent changes the physical form of the insulating member from rigid resin blocks to flexible sheets. This parameter change in material form enables easier manufacturing through bending and shaping, while maintaining the insulation function by covering the necessary surfaces of joint portions.
2Ease of manufacture
If sheet-shaped insulating members are used, then ease of formation is improved, but space utilization may be reduced
Solution Approach 1:
The sheet-shaped insulating member is designed as a thin flexible structure that conforms to the joint portions without adding excessive bulk. This thin-film approach provides necessary insulation while minimizing space occupation, thereby maintaining a high space factor for the coil portion within the slot.
3Reliability
If facing surface insulating parts are connected in both circumferential directions, then insulation coverage is improved, but flexibility and expandability are reduced
Solution Approach 1:
The insulating member is segmented into facing surface insulating parts and circumferential surface insulating parts. The circumferential surface insulating part is intentionally left unconnected at one end, creating a segmented structure that allows radial expansion and contraction while the facing surface parts provide the necessary insulation coverage.
Solution Approach 2:
The insulating member is designed with dynamic characteristics by leaving one circumferential end open. This allows the structure to expand and contract radially as needed, providing adaptability while maintaining insulation effectiveness through the facing surface coverage.
Data Source
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AI summary
In this armature (100), a joint portion (90) is insulated by a joint portion insulating member (21) that has a sheet shape and that includes a facing surface insulating part (21a) that covers a facing surface (90a) of the joint portion (90) and a circumferential surface insulating part (21b) that covers a circumferential surface (90b) of the joint portion (90). The facing surface insulating parts (21a) adjacent to each other in a radial direction are connected by the circumferential surface insulating part (21b) on one side or another side in the circumferential direction.