Stator Segment Design for Synchronous Reluctance Machines
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Solution Overview
Problem
Conventional synchronous reluctance motors with concentrated windings suffer from low torque density and power factor due to high spatial harmonic components, leading to torque ripples and inefficiencies compared to distributed winding systems.
Innovation Solution
A method for designing stator segments with concentrated windings that involves selecting the optimal number of stator teeth and winding phases, determining winding and torque factors, and arranging windings in series and/or parallel connections to maximize the product of these factors, achieving high torque density and efficiency while maintaining production advantages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concentrated windings are used in synchronous reluctance motors, then ease of manufacture and production automation are improved, but torque density and power factor deteriorate due to high spatial harmonic components
Solution Approach 1:
The patent applies parameter changes by optimizing the number of stator teeth z and winding phases m, determining winding factor FW and torque factor FT, and arranging windings in specific series and/or parallel connections. The method maximizes the product FT·FW by selecting optimal design parameters including the number of concentrated windings per phase, their arrangement across tooth structures, and connection configurations, thereby improving torque density while maintaining concentrated winding manufacturing advantages
Solution Approach 2:
The patent applies segmentation by dividing the stator into a ferromagnetic base body with peripherally distributed tooth structures and a winding system with concentrated windings assigned to specific tooth structures. The stator can be divided into a single stator segment or into a plurality of stator segments, each with z tooth structures and corresponding winding phases, enabling modular design and optimized winding distribution to reduce harmonic interference
2Extent of automation
If concentrated windings are used in synchronous reluctance motors, then production automation and installation ease are improved, but power factor deteriorates due to higher spatial harmonic components
Solution Approach 1:
The patent optimizes winding configuration parameters including the number of concentrated windings per phase, their distribution across tooth structures, and series/parallel connection arrangements. By determining optimal winding factor FW and torque factor FT values and maximizing their product, the method improves power factor while maintaining the automation benefits of concentrated windings
Solution Approach 2:
Instead of accepting the conventional disadvantage of concentrated windings regarding power factor, the patent inverts the approach by systematically optimizing winding arrangement and connection methods. The method determines optimal designs by calculating and maximizing the product of winding factor and torque factor across multiple design options, transforming concentrated windings from a disadvantageous configuration into an optimized solution that achieves high power factor
3Power
If concentrated windings are used with optimal winding factor and torque factor, then torque density and power factor are improved, but device complexity increases due to multiple design parameters
Solution Approach 1:
The patent manages complexity by systematically varying and optimizing key parameters: number of stator teeth z, number of winding phases m, winding factor FW, torque factor FT, and their product FT·FW. The method evaluates multiple design and arrangement options for winding phases and selects optimal configurations, balancing improved torque density against the complexity of parameter selection through a structured optimization process
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 method enables the design of synchronous reluctance machines with high torque density and power factor, reducing torque ripples and maintaining production-related benefits of concentrated windings, such as ease of manufacturing and divisibility.
Implementation Method 1
Distributed windings generate a sinusoidal magnetomotive force (MMF) with very low harmonic interference components
Implementation Method 2
a ferromagnetic base body with peripherally distributed tooth structures and a winding system mounted in the base body
Implementation Method 3
synchronous reluctance machines are used as a cost-neutral replacement for asynchronous motors due to their high robustness and high efficiency
Data Source
AI summary
The disclosure relates to a method for designing a stator segment for a stator of an m-phase synchronous reluctance machine with concentrated windings, the stator being divided into a stator segment or a plurality of stator segments and comprising a ferromagnetic base body with peripherally distributed tooth structures and a winding system mounted in the base body, which comprises, per stator segment, z tooth structures and a number of winding phases (U, V, W) corresponding to the number of phases m, each of said winding phases comprising a series connection and/or a parallel connection of a plurality of the concentrated windings, a rotor of the synchronous reluctance machine comprising a pole number p in a peripheral section corresponding to the stator segment.