Rotating Electric Machine Terminal Radial Positioning
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Solution Overview
Problem
Conventional rotating electric machines with distributed winding coils face challenges in downsizing, as the arrangement of terminals leads to increased size in both the axial and radial directions due to the positioning of conductor-exposed portions.
Innovation Solution
The rotating electric machine design alternately arranges first and second coils in the circumferential direction, with their terminals projecting from the same slot, and positions the conductor-exposed portions on the inner side in the radial direction, allowing for a more compact configuration by reducing the radial extent of the terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the first outer-peripheral-side terminal and the second inner-peripheral-side terminal are arranged on the outer side in the radial direction, then the axial length is reduced, but the radial length increases
Solution Approach 1:
The patent transitions the terminal arrangement from a single-plane configuration to a multi-dimensional configuration by having terminals project from different slots in the circumferential direction. The first outer-peripheral-side terminal projects from one slot while the second inner-peripheral-side terminal projects from a different slot, utilizing the circumferential dimension to reduce radial protrusion while maintaining compact axial length.
Solution Approach 2:
The patent divides the terminal arrangement into separate first coils and second coils that are alternately arranged in the circumferential direction. Each coil type has its terminals projecting from different slots, segmenting the overall terminal configuration to achieve more compact radial and axial dimensions through distributed arrangement.
2Length of moving object
If the terminals are arranged to minimize axial length, then the axial dimension is reduced, but the radial dimension increases
Solution Approach 1:
The patent utilizes the circumferential dimension by having first and second coils alternately arranged around the stator core, with their respective terminals projecting from different slots. This three-dimensional distribution of terminals across axial, radial, and circumferential dimensions achieves compact overall size by spreading terminal functions across multiple spatial dimensions rather than concentrating them in one plane.
Data Source
AI summary
To obtain a rotating electric machine capable of downsizing the rotating electric machine in an axial direction and in a radial direction. A first inner-peripheral-side terminal includes a first conductor-exposed portion and a second inner-peripheral-side terminal includes a second conductor-exposed portion opposed to the first conductor-exposed portion. An opposing portion being a portion, at which the first conductor-exposed portion and the second conductor-exposed portion are opposed to each other, extends in a radial direction, and at least a part of the opposing portion of the first conductor-exposed portion and the second conductor-exposed portion is arranged on an inner side in the radial direction compared to the first outer-peripheral-side terminal and the second outer-peripheral-side terminal.