Compressor Motor Stator Spot-Welding Vibration Reduction
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Solution Overview
Problem
Conventional compressors experience increased vibration and noise due to the transmission of motor stator vibrations to the casing, particularly when the motor stator is fixed using shrink-fit methods, leading to problematic vibration and noise levels.
Innovation Solution
The motor stator is spot-joined to the casing at specific positions different from the compression mechanism-side spot-joined portions, dispersing vibrations in the circumferential direction and avoiding areas with teeth to reduce transmission, while ensuring stable attachment with multiple spot-joined portions on steel plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor stator is fixed to the casing by shrink-fit method, then the motor stator is securely attached to the casing, but the vibration of the motor is transmitted to the casing, causing increased vibration and noise of the compressor
Solution Approach 1:
The motor stator is divided into multiple steel plates that are stacked and secured by compression rings and retaining rings. This segmentation allows the vibration to be distributed across multiple interfaces rather than transmitted as a single rigid connection, reducing the overall vibration and noise transmitted to the casing.
Solution Approach 2:
Compression rings and retaining rings are introduced as intermediary elements between the motor stator steel plates and the casing. These intermediaries provide secure attachment while allowing for vibration isolation, preventing direct rigid contact between the motor stator and the casing that would transmit harmful vibrations.
2Ease of manufacture
If the motor stator is fixed using conventional methods, then the attachment is simple, but the vibration transmission from motor to casing is increased
Solution Approach 1:
The motor stator is constructed from multiple steel plates stacked together and secured by compression rings. This segmented structure is relatively simple to manufacture and assemble while effectively reducing vibration transmission through the distributed connection points and flexible interfaces.
Solution Approach 2:
The physical state of the motor stator is changed from a rigid single-piece structure to a flexible stacked plate structure. This parameter change allows the structure to absorb and dampen vibrations while maintaining secure attachment, reducing vibration transmission without significantly complicating the manufacturing process.
3Stability of the object's composition
If multiple spot-joined portions are provided on the motor stator, then the attachment to the casing is stabilized, but the complexity of the attachment structure increases
Solution Approach 1:
The motor stator is segmented into multiple steel plates, each requiring attachment to the casing. This segmentation naturally requires multiple spot-joined portions distributed across the steel plates, providing stable attachment while the modular nature of the segmentation makes the complexity manageable through standardized attachment procedures.
Solution Approach 2:
Multiple spot-joined portions on different steel plates are combined to form a unified attachment system. The compression rings and retaining rings merge the attachment function across all steel plates, stabilizing the overall structure while avoiding the need for complex individual attachment mechanisms at each spot.
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 reduces motor and compression mechanism vibrations transmitted to the casing, minimizing noise and stabilizing the motor stator attachment, thereby reducing overall compressor vibration and noise.
Implementation Method 1
the motor stator vibrates in the radial direction... the vibration of the motor is transmitted to the casing, thus vibrating the entire compressor
Data Source
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AI summary
The present invention is directed to a compressor including a compression mechanism, a motor, and a casing. The vibration and the noise of the compressor due to the vibration of the motor are reduced. A compressor (1) includes a compression mechanism (2), a motor (4) coupled with the compression mechanism (2) via a driving shaft (5), and a casing (10) for accommodating the compression mechanism (2) and the motor (4). The motor (4) includes a stator (41), and a rotor (42) disposed inside the stator (41) and coupled to the driving shaft (5). The stator (41) is spot-joined to the casing (10) via a plurality of stator-side welded portions (6a, ... , 6b, ...) provided at different positions in an axial direction of the driving shaft (5). The plurality of stator-side welded portions (6a, ... , 6b, ...) are provided at different positions in a circumferential direction of the driving shaft (5).