Uneven Stator Tooth Layout for Stable Switched Reluctance Torque
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Solution Overview
Problem
Conventional switched reluctance motors with evenly distributed stator and rotor teeth suffer from inefficiencies in torque generation and stability during rotation, leading to torque ripple and unstable operation.
Innovation Solution
The design introduces unevenly distributed stator teeth divided into phase groups with specific angular alignments relative to evenly distributed rotor teeth, allowing staggered alignment and sequential power application to stabilize electromagnetic torque and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stator teeth are evenly distributed like rotor teeth, then the structure is simple and easy to manufacture, but torque ripple increases and operational stability deteriorates
Solution Approach 1:
The patent applies asymmetry by distributing stator teeth unevenly while maintaining rotational symmetry. Specifically, the stator teeth are arranged with different angular spacings: larger spacing in first and third regions, and smaller spacing in second and fourth regions. This asymmetric distribution creates staggered alignment with evenly distributed rotor teeth, reducing torque ripple and improving operational stability while remaining manufacturable.
2Reliability
If stator teeth are unevenly distributed to reduce torque ripple, then operational stability improves, but device complexity increases
Solution Approach 1:
The patent segments the stator tooth distribution into four distinct regions with different angular spacing characteristics. The first and third regions have larger angular spacings, while the second and fourth regions have smaller angular spacings. This segmentation allows optimization of torque characteristics in different angular zones, reducing overall torque ripple while maintaining a systematic structure that is not overly complex.
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 design achieves stable electromagnetic torque changes and reduced torque ripple, enhancing the operational efficiency and driving capability of the switched reluctance motor.
Implementation Method 1
a magnetic field of the stator may interact with a magnetic field of the rotor
Implementation Method 2
a magnetic flux always tends to close along a path with a minimum reluctance
Data Source
AI summary
A switched reluctance motor, an electric vehicle, and an electric device. The switched reluctance motor comprises a stator and a rotor. A plurality of rotor teeth are evenly distributed at a side of the rotor facing the stator. A plurality of stator teeth are unevenly distributed at a side of the stator facing the rotor, and the plurality of the stator teeth are divided into a plurality of phase groups arranged in sequence. An angle between centerlines of two stator teeth at a junction between two adjacent phase groups is different from an angle between centerlines of two adjacent rotor teeth, so that when the stator teeth in one of the plurality of phase groups are aligned with the rotor teeth, the stator teeth in the rest of the plurality of phase groups are staggered from the rotor teeth.