Multi-Slice Switched Reluctance Motor Layout for Uniform Torque
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Solution Overview
Problem
Conventional Switched Reluctance Motors (SRMs) suffer from low material utilization, leading to inefficiencies, increased costs, weight, torque ripple, and noise due to the limited active phases at any given time, and starting issues related to single pole pair excitation.
Innovation Solution
The arrangement of multiple single-phase SRM slices in a tandem fashion with aligned stator poles and offset rotor poles, along with the use of auxiliary windings and slices, allows for uniform torque delivery, reduced torque ripple, and improved starting capabilities by ensuring at least one slice is always in a torque-producing region and minimizing magnetostrictive noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional SRM uses one or at most two phases active at any point in time, then the structure remains simple, but material utilization is low leading to higher costs and increased weight
Solution Approach 1:
The motor is divided into multiple single-phase slices (first slice, second slice, third slice) arranged in tandem, where each slice can be independently controlled. This segmentation allows more phases to be active simultaneously across different slices, improving material utilization while maintaining the simplicity of individual single-phase slice structures.
Solution Approach 2:
The patent transitions from a conventional single-phase or two-phase SRM structure to a multi-slice configuration where slices are arranged along the axial dimension. This dimensional expansion enables multiple phases to operate simultaneously across different slices, increasing material utilization without complicating the basic single-phase slice design.
2Ease of manufacture
If conventional SRM uses one or at most two phases active at any point in time, then the structure remains simple, but efficiency is lower
Solution Approach 1:
The motor is divided into multiple single-phase slices (first slice, second slice, third slice) arranged in tandem, where each slice can be independently controlled. This segmentation allows more phases to be active simultaneously across different slices, improving material utilization while maintaining the simplicity of individual single-phase slice structures.
Solution Approach 2:
By arranging multiple slices in tandem with offset rotor poles, the patent ensures continuous torque production across all slices. At any given time, multiple phases across different slices can be active, providing continuous useful action and improving overall motor efficiency compared to conventional single-phase or two-phase SRMs.
3Device complexity
If conventional SRM uses single pole pair excitation, then the structure remains simple, but torque ripple and noise increase
Solution Approach 1:
The motor is divided into multiple single-phase slices (first slice, second slice, third slice) arranged in tandem, where each slice can be independently controlled. This segmentation allows more phases to be active simultaneously across different slices, improving material utilization while maintaining the simplicity of individual single-phase slice structures.
Solution Approach 2:
The patent merges multiple single-phase slices into a unified multi-slice SRM system where the slices work together. By combining the torque output from multiple slices with offset rotor poles, the system achieves smoother torque delivery and reduced ripple while maintaining the simplicity of individual single-phase slice excitation structures.
4Device complexity
If conventional SRM uses single phase configuration, then the structure remains simple, but starting problem occurs
Solution Approach 1:
The motor is divided into multiple single-phase slices (first slice, second slice, third slice) arranged in tandem, where each slice can be independently controlled. This segmentation allows more phases to be active simultaneously across different slices, improving material utilization while maintaining the simplicity of individual single-phase slice structures.
Solution Approach 2:
The offset arrangement of rotor poles across multiple slices creates preliminary torque conditions that facilitate starting. The offset configuration ensures that at least one slice is always in a torque-producing region, providing preliminary action that enables reliable motor starting without requiring additional starting mechanisms.
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
This configuration achieves complete material utilization, reduces noise and torque ripple, and addresses starting problems, resulting in higher efficiency, reduced costs, and optimized performance for various applications including electric vehicles and home appliances.
Implementation Method 1
Switched Reluctance Motor or SRM...both of the stator and the rotor have the salient pole structure, the SRM may be considered as having a double salient pole type structure
Implementation Method 2
noise is because of the single pole pair excitation of the stator leading to magneto strictive noise
Data Source
AI summary
The embodiments herein provide a multitude of single-phase Switch Reluctance Motor (SRM) arranged in a suitable fashion in order to achieve uniform torque with complete material utilization. The embodiment herein also provides a series of single-phase Switch Reluctance Motor (SRM) arranged in appropriate manner for better utilization of material leading to better efficiencies, reduced cost, reduced size or weight and reduction in torque ripple and noise. In addition, the embodiments herein also provide a two-slice SRM system and method, which correspondingly resolves the starting problem.