Switched Reluctance Machine Odd Pole-Phase Index
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Solution Overview
Problem
Conventional switched reluctance machines suffer from high torque ripple, low torque density, vibration, and acoustic noise due to their design, and existing solutions require iterative configurations to achieve optimal performance.
Innovation Solution
A switched reluctance machine design with a predetermined number of salient stator and rotor poles, where the number of rotor poles is determined based on the number of phases using specific mathematical relationships to ensure symmetric and mutually coupled configurations, utilizing soft magnetic materials and equidistant pole placement for improved torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional switched reluctance machines use traditional pole configurations, then the structure is simple and easy to manufacture, but torque ripple is high and torque density is low
Solution Approach 1:
The patent applies parameter changes by modifying the pole-phase index to an odd number and using the specific relationship Nr = (Ns×m)/k to optimize the interaction between stator and rotor poles. This changes the fundamental geometric parameters of the machine to achieve smoother torque production while maintaining manufacturing simplicity through the systematic design approach.
Solution Approach 2:
The patent introduces asymmetry in the pole configuration by using an odd pole-phase index instead of the conventional even number. This asymmetric approach creates more favorable magnetic flux distribution patterns that reduce torque ripple and improve torque density without complicating the basic manufacturing process.
2Device complexity
If conventional switched reluctance machines use traditional pole configurations, then the design is straightforward, but vibration and acoustic noise are high
Solution Approach 1:
By changing the pole-phase index to an odd number and applying the Nr = (Ns×m)/k relationship, the patent modifies the magnetic interaction parameters to produce more uniform flux distribution. This reduces the harmonics that cause vibration and acoustic noise while keeping the design methodology systematic and manageable.
Solution Approach 2:
The patent converts the potentially harmful effects of magnetic flux irregularities into beneficial smooth operation by carefully selecting odd pole-phase indices. The specific pole configuration relationships transform what could be disruptive flux patterns into balanced, harmonious magnetic fields that reduce vibration and noise.
3Power
If the number of stator and rotor poles is increased to improve torque density, then torque density increases, but the machine complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the pole configuration into systematic groups defined by the relationship Nr = (Ns×m)/k with odd pole-phase index. This segmentation allows for optimized torque density through increased pole counts while maintaining manageable complexity through the structured mathematical framework that guides the configuration.
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 design achieves low manufacturing costs, reduced torque ripple, high torque density, and smoother operation by maintaining balanced flux patterns and symmetrical pole distribution, thereby minimizing vibration and noise.
Implementation Method 1
a plurality of coils provided around the predetermined number of stator poles to form at least one phase of the switched reluctance machine, the plurality of coils adapted to carry electric current to generate magnetic flux in the predetermined number of stator poles
Implementation Method 2
A reluctance machine is an electric machine in which torque is produced by the tendency of the movable part of the machine to move into a position where the inductance of an excited winding is maximized
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein comprises a stator including a predetermined number of salient stator poles (Ns), a rotor rotatably mounted with respect to the stator, with the rotor comprising a plurality of salient rotor poles, and a plurality of coils provided around the predetermined number of stator poles to form at least one phase of the switched reluctance machine, where the rotor poles and the stator poles are symmetrically disposed, and a number of rotor poles is related to Ns and a number of phases according to: i) Nsmkceilmodkmm for an odd number of phases, and ii) Nsmkceilmodkm2m2 for an even number of phases, where m is the number of phases, and k is a configuration index based on Ns and m.