Motor and compressor including the same
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Solution Overview
Problem
Compressive stress on the stator in compressors, such as those used in air conditioners and clothes dryers, degrades the electromagnetic properties of the motor, leading to reduced efficiency.
Innovation Solution
Incorporating a stress absorber with a deformation portion, contact portion, and cavity in the stator's back yoke, which absorbs compressive stress from the housing, allowing the stator to be securely fixed while minimizing stress on non-contact areas, thus maintaining electromagnetic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is interference fitted into the housing to secure fixation, then the fixation reliability is improved, but compressive stress occurs on the stator degrading electromagnetic properties
Solution Approach 1:
The back yoke is divided into multiple deformation portions, each corresponding to a tooth, with independent cavities and contact portions. This segmentation allows localized stress absorption at each tooth position while maintaining overall structural integrity and electromagnetic properties in non-stress areas.
Solution Approach 2:
The deformation portions with cavities are strategically positioned at specific locations where stress concentration occurs (at the back of each tooth). This local modification allows stress absorption precisely where needed without affecting the electromagnetic properties of the main stator body and coil windings.
2Stability of the object's composition
If the stator is securely fixed to the housing, then the mechanical stability is improved, but the electromagnetic properties degrade due to stress
Solution Approach 1:
The deformation portions act as intermediary elements between the housing and the main stator body. These intermediaries absorb compressive stress through elastic deformation within their cavities, preventing direct stress transmission to the electromagnetic components while maintaining the fixed connection between stator and housing.
Solution Approach 2:
The cavities within the deformation portions change their volume parameter under compressive load, allowing the structure to accommodate dimensional changes and absorb stress. This parameter change enables the stator to remain securely fixed while protecting electromagnetic properties from stress-induced degradation.
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 solution effectively reduces compressive stress on the stator, enhancing motor efficiency and preventing degradation of electromagnetic properties.
Implementation Method 1
a deformation portion compressed and deformed by the housing
Data Source
AI summary
A compressor including a housing, and a motor including a stator to be interference fitted into and fixed to an inner circumferential surface of the housing and a rotor rotatable inside the stator. The stator includes an annular back yoke disposed inside the housing, a plurality of teeth extending radially inward from the back yoke, and a coil wound on the plurality of teeth. The back yoke includes a deformation portion compressed and deformed by the housing while the stator is interference fitted into the inner circumferential surface of the housing, a contact portion which protrudes radially outward from the deformation portion and being in contact with the housing, and a cavity formed on a radial inner side of the deformation portion into which the deformation portion is deformed.