Rotary Electric Machine Ball Coupling for Stator Vibration Isolation
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Solution Overview
Problem
Vibration and noise transmission from the stator to the housing in rotary electric machines, such as motor-generators, due to magnetostriction, is a significant issue that needs to be addressed.
Innovation Solution
The implementation of coupling mechanisms using annular members and balls with controlled backlash directions to couple the stator and housing, restricting radial movement and reducing vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator is rigidly coupled to the housing, then structural stability is improved, but vibration and noise transmission from the stator to the housing increases
Solution Approach 1:
A coupling mechanism comprising first and second annular members with balls interposed between them is introduced as an intermediary between the stator and housing. The balls are disposed in recesses of both annular members, creating a controlled connection that allows relative movement while maintaining structural integrity. This intermediary structure reduces direct rigid coupling, thereby minimizing vibration and noise transmission from the stator to the housing while preserving necessary structural stability.
2Ease of manufacture
If the coupling mechanism uses traditional rigid connection, then manufacturing simplicity is improved, but backlash control in multiple directions becomes difficult
Solution Approach 1:
The coupling mechanism employs asymmetric recess design where the first recesses in the first annular member and second recesses in the second annular member have different geometries. This asymmetric configuration allows the balls to be constrained differently in radial, circumferential, and axial directions, achieving controlled backlash characteristics without requiring complex manufacturing processes. The asymmetric recess shapes enable precise backlash control while maintaining relative manufacturing simplicity.
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 effectively minimizes vibration and noise transmission to the housing while maintaining an appropriate air gap, thereby enhancing the operational stability and reducing noise in motor-generators.
Implementation Method 1
Vibration and noise transmission from the stator to the housing in rotary electric machines, such as motor-generators, due to magnetostriction, is a significant issue that needs to be addressed
Data Source
AI summary
A rotary electric machine includes a rotor including a shaft, a stator disposed around the rotor, a housing configured to house the stator, a first annular member disposed on the stator and having first recesses disposed in a circumferential direction, a second annular member disposed on the housing and having second recesses disposed in the circumferential direction, and balls interposed between the first annular member and the second annular member. Each ball is disposed in both of each of the first recesses and each of the second recesses. The first annular member, the second annular member, and the balls constitute a coupling mechanism configured to couple the housing and the stator to each other. A backlash in a radial direction in the coupling mechanism is narrower than a backlash in the circumferential direction in the coupling mechanism and narrower than a backlash in an axial direction in the coupling mechanism.