Stator with Star-Delta Composite Winding for Noise Suppression
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Solution Overview
Problem
Conventional rotary electric machines experience operation noise and circulating currents due to the detailed adjustment of wiring connections between phase windings, which limits their output characteristics and increases manufacturing costs.
Innovation Solution
A stator design with phase windings arranged in a star Y-delta composite connection, where conductors are connected in series across multiple layers in adjacent slots, preventing circulating currents and allowing for various electrical connections, including star and delta configurations, to suppress operation noise and circulating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detailed adjustment of wiring connection is performed to achieve wide variation of output characteristics, then adaptability is improved, but operation noise and circulating current are generated
Solution Approach 1:
The stator windings are divided into two distinct groups: star-connected windings accommodated in first slots and delta-connected windings accommodated in second slots. This segmentation allows each group to function independently, preventing circulating currents while maintaining adaptability through selective connection configurations.
Solution Approach 2:
Different connection configurations (star or delta) are applied to different local groups of windings rather than uniformly across all windings. The first slots contain star-connected windings while second slots contain delta-connected windings, allowing localized optimization of electrical characteristics without generating harmful circulating currents.
2Reliability
If star Y-delta composite connection is implemented to suppress circulating current, then reliability is improved, but device complexity increases
Solution Approach 1:
Star-connected and delta-connected winding groups are merged into a single stator structure with adjacent first slots and second slots. This combination allows the system to benefit from both connection types simultaneously while maintaining a unified, manageable structure rather than requiring separate independent systems.
Solution Approach 2:
The stator is designed to accommodate multiple connection configurations (star and delta) within a single structure. The first slots and second slots can be configured in various combinations, allowing the same physical structure to serve multiple functional purposes and adapt to different operational requirements.
Data Source
AI summary
In a stator having a stator core and three phase windings, slots are formed in the stator core. The phase winding are accommodated in layers, from one side to the other side in the corresponding slot along a radial direction of the stator core. The phase windings are arranged in a star-delta composite connection structure. The phase winding in each phase is comprised of conductors accommodated in a first slot and a second slot adjacently arranged in the stator core so that the conductor in the n-th layer is electrically connected to the conductor in the (n+1)-th layer, ascending order, per slot. Because each winding has the same length and no difference in electric potential occurs between the star connection and the delta connection, this structure suppress generation of operation noise and a circulating current through the stator core and prevents loss due to the circulating current.