Stator Winding System Reducing Half-Bridge Count
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Solution Overview
Problem
The complexity and cost of stator winding systems for electric machines increase with the number of slots or phases, which affects the distribution of magnetomotive force and requires numerous half-bridges, making the system inefficient and costly.
Innovation Solution
A winding system with at least two short-circuit means and half as many half-bridges as conductor segments, where each conductor segment is connected to a half-bridge to generate a rotating field, reducing the number of required half-bridges while maintaining similar quality, thus simplifying the system and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of slots or phases in the stator is increased to improve the distribution of magnetomotive force and quality of rotating field, then the quality of the rotating field is improved, but the number of half-bridges increases, leading to increased system complexity and costs
Solution Approach 1:
The stator winding is segmented into two independent sets of conductor segments (first and second sets), each connected to a common short-circuit means. This segmentation allows the use of fewer half-bridges per set while maintaining the overall quality of the rotating field through the combined effect of both sets.
Solution Approach 2:
The common short-circuit means serves multiple functions: it electrically connects all conductor segments within each set, provides a return path for currents, and enables the generation of rotating magnetic fields with different pole numbers using the same physical structure.
2Reliability
If the number of slots or phases is increased to approach sinusoidal magnetomotive force distribution, then the quality of the rotating field is improved, but the cost of the winding system increases
Solution Approach 1:
The winding system is divided into two independent sets of conductor segments that can be manufactured and assembled separately. Each set uses a common short-circuit means, reducing the total number of connection points and associated costs compared to traditional per-slot connections.
Solution Approach 2:
The system enables flexible generation of rotating magnetic fields with different pole numbers (2p = 2, 4, 6, ...) using the same physical winding structure by changing the excitation parameters, eliminating the need for multiple specialized windings for different applications.
3Ease of operation
If each slot has its own phase requiring separate switches or half-bridges, then the control of each conductor segment is precise, but the number of switches or half-bridges equals the number of slots, increasing complexity
Solution Approach 1:
Multiple conductor segments within each set are merged into a common electrical connection through the common short-circuit means. This merging reduces the total number of half-bridges from one per slot to one per set, while the independent control of the two sets maintains sufficient control precision for generating rotating fields.
Solution Approach 2:
The common short-circuit means provides a universal connection point for all conductor segments in each set, serving as both a electrical connector and a control node. This universal approach simplifies the control architecture while maintaining the ability to generate precise rotating magnetic fields.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed winding system achieves reduced complexity and cost while maintaining the quality of the rotating field, allowing for efficient operation of electric machines with fewer half-bridges, thereby enhancing the efficiency of the electric machine.
Implementation Method 1
The half-bridges can be set up to respectively supply the first and second conductor segments of a pair with a phase current. The winding system can be configured to generate a time-varying rotating field
Implementation Method 2
The first conductor segments are electrically conductively connected to each other on a first side of the stator via the first short-circuit means. In addition, the second conductor segments are electrically conductively connected to each other on the first side of the stator via the second short-circuit means
Data Source
AI summary
A winding system for a stator of an electric machine is specified. The winding system comprises at least two first conductor segments and at least two second conductor segments, at least two half-bridges, at least one first short-circuit means and at least one second short-circuit means. Each half-bridge is connected to least one first conductor segment and one second conductor segment, each first conductor segment is connected to the first short-circuit means, and each second conductor segment is connected to the second short-circuit means. Further, an electric machine having a winding system is specified.