Stator Winding Segmentation for Circulating Current Suppression
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Solution Overview
Problem
Conventional stators in rotary electric machines with multiple phase windings arranged in parallel face challenges in suppressing circulating currents, leading to energy losses, as existing techniques do not effectively prevent circulating current generation when the number of phase windings exceeds two.
Innovation Solution
The stator design incorporates a distributed winding structure with conductors stacked in multiple layers across adjacent slots, where conductors in each layer are electrically connected to prevent circulating currents, and phase windings can be configured in star, delta, or star-delta connections to manage electrical potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple phase windings are arranged in parallel to increase power output, then the power capability is improved, but circulating currents are generated causing energy losses
Solution Approach 1:
The stator windings are segmented into multiple independent phase windings (e.g., U1, U2, V1, V2, W1, W2) that are connected in parallel. Each phase winding is further divided into multiple coils that can be independently connected, allowing the system to achieve high power output while providing multiple connection configurations to suppress circulating currents.
Solution Approach 2:
The patent provides multiple dynamic connection configurations (star connection, delta connection, star-delta connection) that can be selected based on operational requirements. These different connection modes allow the system to adaptively suppress circulating currents while maintaining high power output capability, making the solution dynamic rather than fixed.
2Ease of manufacture
If conventional parallel winding structures are used to simplify manufacturing, then manufacturing complexity is reduced, but circulating current suppression becomes ineffective when phase windings exceed two
Solution Approach 1:
The winding structure is segmented into multiple independent phase windings with clear identification of terminals and connection points. This segmentation maintains manufacturing simplicity by providing a modular structure while enabling reliable circulating current suppression through the multiple connection configurations available for the segmented windings.
Solution Approach 2:
The patent changes the connection parameters (star, delta, star-delta) of the phase windings to achieve circulating current suppression. By providing multiple connection mode options, the system can adjust its electrical parameters to match different operational requirements, maintaining both ease of manufacture and reliability.
3Power
If phase windings are connected in parallel to improve power density, then the power density is improved, but circulating currents cause additional energy losses
Solution Approach 1:
The patent implements dynamic connection configurations that can be adjusted based on operational conditions. The multiple phase windings can be connected in star, delta, or star-delta modes, allowing the system to optimize power density while suppressing circulating currents through appropriate configuration selection.
Solution Approach 2:
By changing the connection parameters (star/delta/star-delta) of the parallel-connected phase windings, the system can achieve high power density while eliminating circulating current losses. The parameter changes allow adaptation to different load conditions and operational requirements.
Data Source
AI summary
In a stator having a stator core and phase windings, slots are formed in the stator core and each slot accommodates conductors in a layer structure from one end to the other end of the slot in a radial direction of the stator core. The phase windings in one phase have conductors accommodated in a first slot and a second slot which are adjacently formed in the stator core. An electrical connection between the conductors in a n-th layer and the conductors in a (n+1)-th layer includes that the conductors accommodated in the first slot are electrically connected together, the conductors accommodated in the second slot are electrically connected together, and the conductors accommodated in the first slot are electrically connected with the conductors accommodated in the second slot. This connection eliminates a phase difference in the first slot and the second slot in a distributed winding structure.