Switched Reluctance Machine Stator Isolation Bridges
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Solution Overview
Problem
Switched reluctance machines (SRMs) experience high levels of noise and vibration due to torque ripple, which current dampening and insulation methods fail to adequately address, leading to unacceptable levels of physical shaking and noise emission.
Innovation Solution
Incorporating a gap between the stator outer surface and the housing, with the stator and rotor supported by bridges connecting to housing endplates, and maintaining alignment through an intermediate structure, thereby isolating the stator/rotor mechanisms and eliminating direct mechanical contact between the stator and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator is directly connected to the housing for structural support, then mechanical stability is improved, but noise and vibration increase due to direct transmission of torque ripple
Solution Approach 1:
The patent introduces an intermediate structure (isolating bridges) between the stator and housing that mechanically decouples them. This intermediary element allows the stator to be supported while preventing direct transmission of vibration and noise to the housing, thus resolving the contradiction between mechanical stability and noise reduction.
Solution Approach 2:
The patent segments the mechanical connection by replacing a continuous stator-housing connection with discrete isolating bridges. This segmentation allows selective transmission of forces - providing structural support where needed while isolating vibration paths, thereby reducing noise and vibration while maintaining stability.
2Object-generated harmful factors
If dampening and insulation materials are added to reduce noise and vibration, then noise levels decrease, but device complexity and manufacturing cost increase
Solution Approach 1:
The isolating bridges serve as passive intermediary structures that inherently provide mechanical isolation without requiring additional dampening materials or complex insulation layers. This approach reduces noise and vibration through structural design alone, avoiding increased device complexity.
3Manufacturing precision
If the stator and rotor are tightly mounted to the housing for precision alignment, then alignment precision is improved, but torque ripple and resulting noise increase
Solution Approach 1:
The isolating bridges provide a unique dual function: they maintain precise alignment between stator and rotor while simultaneously acting as vibration isolators. The bridges are designed with sufficient stiffness for alignment but controlled flexibility for vibration isolation, resolving the contradiction between precision and noise.
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 significantly reduces noise and vibration by absorbing displacement and pressure waves through the gap, while maintaining effective heat dissipation and allowing for precise control of phase activations, resulting in a more stable SRM operation.
Implementation Method 1
a gap between the stator outer surface and the housing... significantly reduces noise and vibration by absorbing displacement and pressure waves
Implementation Method 2
the SRM runs by reluctance torque, where rotor position is rotationally urged by voltage strokes and the accompanying magnetic communication between rotor and stator
Data Source
AI summary
A switched reluctance machine exhibiting reduced noise and vibration, the machine comprising at least one rotor arranged to rotate about a central axis, the at least one rotor comprising a set of rotor poles arranged about the central axis; at least one stator positioned concentric to and radially outward from both the central axis and the at least one rotor, the at least one stator having an outer surface and an outer surface active zone; a housing having a sleeve positioned only radially outward from the stator outer surface active zone; at least one housing endplate coupled to an end of said housing; and wherein said stator has no direct connection to said housing.