Stator Wire Connection Layout for Compact Y-Connected Windings
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Solution Overview
Problem
Existing rotary electric machines require further downsizing for mounting on moving bodies such as automobiles, while maintaining performance.
Innovation Solution
A stator design for rotary electric machines featuring a cylindrical core with slots, side-by-side coils connected in 2n sets of Y-connected wires, and a wire connection portion with overlapping conductive plate members and neutral-point connection plates to reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional connection plates are used to connect coil end portions, then the stator can be assembled, but the stator size becomes large and cannot be sufficiently downsized
Solution Approach 1:
The patent combines multiple connection functions into a single integrated connection plate structure. The connection plate simultaneously connects coil end portions of the same phase, connects neutral points of different phases, and provides mechanical support, thereby reducing the number of separate components and minimizing the overall wire connection portion area to achieve stator downsizing.
Solution Approach 2:
The connection plate extends in the axial direction of the stator core, utilizing the axial dimension to arrange connection points for multiple coils and neutral points. This three-dimensional arrangement allows multiple connection functions to be achieved within a compact radial and circumferential footprint, effectively reducing the stator's overall volume.
2Area of stationary object
If multiple separate connection plates are used to connect different phases and neutral points, then reliable electrical connection is achieved, but the wire connection portion occupies large area
Solution Approach 1:
The patent integrates phase connection functions and neutral point connection functions into a single connection plate structure. The connection plate includes first connection portions for connecting coil ends of the same phase and second connection portions for connecting neutral points of different phases, all within one unified component, thereby minimizing the total area while maintaining reliable electrical connections.
Solution Approach 2:
The connection plate serves multiple functions simultaneously: it connects coil end portions of the same phase, connects neutral points of different phases, provides mechanical support for the windings, and establishes electrical continuity. This multi-functionality reduces the number of separate components needed and minimizes the overall wire connection portion area.
Data Source
AI summary
A stator in a rotary electric machine includes a cylindrical-shaped core having a plurality of slots, and coils disposed side by side in the slots, the coils having respective end portions connected to each other to constitute 2n sets of Y-connected wires (n is an integer of 1 or more) constituted by a group of phase windings having different electric phases. The stator further includes a wire connection portion connecting the coils to each other. The wire connection portion includes a first conductive plate member, a second conductive plate member, and a third conductive plate member for connecting the end portions of the coils of the same phase to each other, and a neutral-point connection plate member for connecting neutral points of the group of phase windings to each other. The neutral-point connection plate member connects a coil disposed in an inner layer in a radial direction of the core and a coil disposed in an outer layer in the radial direction of the core to each other, and the neutral-point connection plate member is divided into a plurality of sections in a circumferential direction of the core. In the wire connection portion, at least one of the first conductive plate member, the second conductive plate member, and the third conductive plate member and at least one of the sections of the divided neutral-point connection plate member are disposed at positions overlapping each other in an axial direction of the core.