Double-Stator Single-Winding Switched Reluctance Machine Torque Ripple
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Solution Overview
Problem
Conventional switched reluctance machines experience torque ripple due to the periodic fluctuation of torque profiles, which can be attributed to the configuration of stators and rotors, leading to inefficiencies in motor drive systems.
Innovation Solution
A switched reluctance machine design featuring a rotor with salient poles and two stators, where only one stator has coils wound around its poles, and the other stator does not, with specific relationships between the number of poles and phases to minimize torque ripple, and optimized using finite element analysis for improved torque quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coils are wound around all stator poles in a conventional switched reluctance machine, then the machine can produce torque, but torque ripple occurs due to periodic fluctuation of torque profiles
Solution Approach 1:
The stator is segmented into two separate stators (first stator and second stator), each with distinct pole configurations. The first stator has coils wound around selected poles while the second stator has no coils, creating complementary torque profiles that when combined reduce overall torque ripple while maintaining power output.
2Power
If coils are wound around all stator poles, then torque can be produced, but the manufacturing complexity and cost increase
Solution Approach 1:
The coil winding operation is extracted from the second stator entirely, eliminating the need to wind coils around all stator poles. Only the first stator requires coil windings on selected poles, significantly reducing manufacturing complexity and cost while sufficient torque production is maintained through the dual-stator configuration.
3Stability of the object's composition
If a dual-stator configuration is implemented with one stator having coils and the other without, then torque ripple is reduced, but the device complexity increases
Solution Approach 1:
The second stator without coils serves multiple functions: it provides magnetic flux paths, contributes to torque production through its pole structure, and helps reduce torque ripple through its geometric configuration. This multi-functionality allows the structure to achieve torque ripple reduction without proportionally increasing device complexity.
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 configuration reduces torque ripple and enhances average torque, facilitating more efficient operation and manufacturing by focusing coil windings on specific stator poles, thereby improving the overall performance of switched reluctance machines.
Implementation Method 1
A respective winding is disposed between every pair of adjacent poles of either stator. A controller is electrically coupled to the windings. The apparatus operates with a plurality of separately excitable phases, a given phase being excited by energizing the windings corresponding to the given phase.
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
AI summary
A three-phase switched reluctance machine has a rotor, a first stator and a second stator. The rotor, first stator and second stator are coaxially and concentrically disposed. The rotor and both the first stator and second stator have corresponding poles. Only one of the stators has coils wound about its poles, while the other stator does not have any coils. A defined relationship between the number of rotor poles, the number of stator poles on the first stator and the number of stator poles on the second stator may improve the torque quality of the switched reluctance machine.