Blower Motor Vibration Isolation via Nested Elastic Members
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor designs for continuous positive airway pressure (CPAP) devices face challenges in reducing vibration transmission to the motor housing and blower, leading to increased size and noise due to vibration-proof measures, and existing solutions do not effectively isolate the rotor and stator vibrations from the motor housing.
Innovation Solution
A motor design featuring a dual motor housing structure with concentric bearing housings and elastic members to isolate rotor and stator vibrations, where the first elastic member is interposed between the stator core and the motor housing and the second elastic member is used between the bearing and bearing housing, serially limiting vibration transmission and applying pre-load to bearings for extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration-proof measures such as wrapping or hanging with elastic components are applied to the motor, then vibration transmission to the motor housing is reduced, but the outer diameter of the motor and blower increases
Solution Approach 1:
The bearing housing is nested within the stator core structure, with the elastic member integrated into the radial space between the bearing housing outer peripheral surface and the stator core inner peripheral surface. This nested configuration allows vibration isolation without increasing the motor's outer diameter.
Solution Approach 2:
The elastic member is positioned locally at the radial interface between the bearing housing and stator core, providing vibration isolation specifically at the critical transmission path from bearing to motor housing without requiring global structural changes.
2Stability of the object's composition
If a cap made of an elastic body is mounted on the outer peripheral portion of the ball housing to suppress bearing creep, then bearing rotation is restricted, but the driving between stator and rotor is transmitted to the motor housing causing noise
Solution Approach 1:
The elastic member acts as an intermediary element between the bearing housing and the stator core, serving dual functions: suppressing bearing creep through radial constraint while simultaneously isolating the driving vibrations from transmission to the motor housing, thereby reducing noise.
3Object-affected harmful factors
If the motor is hung with an elastic component for vibration proofing, then vibration transmission is reduced, but the product shape becomes large due to required space
Solution Approach 1:
The elastic member is nested within the radial clearance between the bearing housing and stator core, utilizing existing internal space rather than requiring external attachment space. This eliminates the need for additional product volume while achieving vibration isolation.
4Object-affected harmful factors
If concentric bearing housings are integrally assembled with the stator core with elastic members, then vibration transmission is serially limited and pre-load is applied to bearings, but the device structure becomes more complex
Solution Approach 1:
The bearing housings are integrally assembled with the stator core, merging these components into a unified structure. The elastic members are integrated into the radial interface of this merged structure, providing both mechanical support and vibration isolation without requiring separate independent components.
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 effectively reduces rotational and stator vibrations transmitted to the motor housing, minimizing noise and allowing for a more compact blower configuration by serially isolating vibrations and applying stable pre-load to bearings, thereby enhancing the motor's operational efficiency and longevity.
Implementation Method 1
a first elastic member is interposed between an outer peripheral surface of the core back portion of the stator core and an inner wall surface of the second motor housing in a radial direction
Implementation Method 2
a second elastic member is assembled by being stacked between the bearing assembled in one of the pair of bearing housings and the bearing housing
Data Source
AI summary
A first elastic member is interposed between an outer peripheral surface of the circular core back portion and an inner wall surface of the second motor housing in a radial direction, both outer peripheral ends of the core back portion in the axial direction of the rotor are covered with the first elastic member, the first elastic member is assembled by being pinched between end surfaces of the first motor housing and the second motor housing which faces each other, and a second elastic member is assembled by being stacked between the bearing assembled in one of the pair of bearing housings and the bearing housing.