Wye-Delta Hybrid Winding Parallel Circuit Configuration
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Solution Overview
Problem
Conventional rotary electric machines with wye-delta hybrid windings face non-uniform temperature distribution due to differing current densities in delta and wye windings, requiring different conductor wire sizes which complicates manufacturing and affects bendability and tooling needs.
Innovation Solution
Configuring phase windings of wye windings into parallel circuits using conductor wires of identical cross-sectional area to equalize current densities with delta windings, allowing for uniform temperature distribution and simplified manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If different cross-sectional area conductor wires are used to equalize current densities in wye and delta windings, then uniform temperature distribution is achieved, but manufacturing complexity increases and coil bendability becomes nonuniform
Solution Approach 1:
The patent changes the electrical connection configuration rather than physical parameters. By connecting wye-phase windings in parallel between delta windings, the current density in wye windings is reduced to match delta windings while using identical conductor wires, achieving uniform temperature distribution without manufacturing complexity
Solution Approach 2:
The patent uses identical conductor wires for both wye and delta windings, copying the same wire specification throughout. This eliminates the need for different wire sizes while achieving current density equalization through the parallel connection configuration
2Temperature
If different cross-sectional area conductor wires are used to equalize current densities, then uniform temperature distribution is achieved, but dedicated tools are required for each wire type
Solution Approach 1:
The patent changes the electrical connection configuration rather than physical parameters. By connecting wye-phase windings in parallel between delta windings, the current density in wye windings is reduced to match delta windings while using identical conductor wires, achieving uniform temperature distribution without manufacturing complexity
Solution Approach 2:
The patent makes the conductor wires universal by using identical wires for both wye and delta windings. This single wire type can be shaped with the same tools and processes, eliminating the need for dedicated tools for different wire types and simplifying manufacturing
3Ease of manufacture
If identical conductor wires are used for both wye and delta windings, then manufacturing rationalization is improved, but current density difference causes nonuniform temperature distribution
Solution Approach 1:
The patent changes the electrical connection configuration rather than physical parameters. By connecting wye-phase windings in parallel between delta windings, the current density in wye windings is reduced to match delta windings while using identical conductor wires, achieving uniform temperature distribution without manufacturing complexity
Solution Approach 2:
The patent achieves homogeneity in both material and electrical characteristics. Identical conductor wires are used throughout, and the parallel connection configuration ensures uniform current density distribution, resulting in homogeneous temperature distribution across all windings
Data Source
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AI summary
The stator winding includes: a first three-phase wye-delta hybrid winding that is configured by connecting phase windings of a first wye winding to respective output ends of a first delta winding; and a second three-phase wye-delta hybrid winding that is configured by connecting phase windings of a second wye winding to respective output ends of a second delta winding. The phase windings of the first and second wye windings are configured by connecting two winding portions in parallel, and those two winding portions are configured such that distributions of radial positions inside slots of conductor wires that constitute the winding portions are equal.