Motor Compressor Suction Shaft for Stator Support
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Solution Overview
Problem
Existing motor-operated compressors face issues with uneven radial supporting force leading to stator deformation, reduced motor efficiency, increased vibration noise, and limited refrigerant passage due to recessed suction flow paths, which restrict the outer diameter of the stator and lengthen the compressor.
Innovation Solution
A motor-operated compressor design with a uniform casing rigidity and a suction communication passage within the rotation shaft or its outer surface, eliminating the need for a separate passage between the casing and stator, allowing for a wider refrigerant passage and improved motor efficiency by maintaining a consistent gap between the stator and rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If suction flow paths are recessed into the inner circumferential surface of the motor unit housing, then refrigerant can flow from front space to rear space, but the stator core becomes deformed due to uneven radial supporting force
Solution Approach 1:
The suction flow path is localized to the rotation shaft rather than being distributed around the motor unit housing, concentrating the refrigerant passage in one specific location to avoid creating multiple unsupported areas on the stator core
Solution Approach 2:
The rotation shaft serves as an intermediary structure that provides a dedicated refrigerant passage, separating the refrigerant flow function from the motor unit housing structure, thereby eliminating the need for recessed flow paths in the housing that would compromise stator support
2Productivity
If suction flow paths are formed at the outer circumferential surface of the stator, then refrigerant passage is provided, but the outer diameter of the stator is reduced limiting motor output
Solution Approach 1:
The suction flow path function is extracted from the stator structure and relocated to the rotation shaft, allowing the stator to maintain its full outer diameter for optimal motor output while the rotation shaft provides the necessary refrigerant passage
Solution Approach 2:
The refrigerant passage is moved from the radial dimension (affecting stator outer diameter) to the axial dimension (within the rotation shaft), allowing independent optimization of both motor output and refrigerant flow
3Productivity
If multiple suction flow paths are recessed along the circumferential direction, then refrigerant flow is enabled, but the compressor length increases
Solution Approach 1:
Multiple separate suction flow paths recessed in the motor unit housing are merged into a single integrated refrigerant passage within the rotation shaft, simplifying the structure and reducing the overall compressor length while maintaining refrigerant flow capability
Data Source
AI summary
A motor-operated compressor includes a compression unit including a compression chamber formed by a plurality of scrolls engaged with each other. The compressor includes a rotation shaft having one end coupled to one of the scrolls and a rotor coupled with another end of the rotation shaft. The compressor includes a stator radially separated from the rotor by a predetermined gap. The compressor includes a casing having a motor chamber. The stator is inserted in the motor chamber and divides the motor chamber into a first space and a second space. The casing includes an inlet port coupled to the first space to guide a refrigerant toward the motor chamber. The casing also includes a suction guide passage coupled to the second space to guide the refrigerant sucked through the inlet port toward the compression unit. A communication passage portion in the rotation shaft communicates the first and second spaces.