Motor and compressor that uses same
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Solution Overview
Problem
Motor casings are prone to distortion under high temperature or pressure conditions during manufacturing or operation, particularly when resin is press-fitted, leading to a need for enhanced strength to prevent deformation and cracking.
Innovation Solution
A motor casing design featuring a cylindrical structure with ribs extending in the circumferential direction on its outer surface, which increases the casing's strength and resistance to deformation, combined with a cooling fan system for improved heat dissipation and a manufacturing method using sand molds to produce the casing with integrated ribs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor casing is made with a simple cylindrical structure, then the ease of manufacture is improved, but the strength and resistance to deformation deteriorate under high temperature and pressure conditions
Solution Approach 1:
The motor casing is segmented into multiple functional zones through the addition of ribs. These ribs divide the casing structure into distinct regions that can independently handle different mechanical stresses, thereby enhancing overall strength without complicating the manufacturing process. The ribs are integrated into the molding process, maintaining ease of manufacture while providing structural reinforcement.
Solution Approach 2:
The design transitions from a two-dimensional cylindrical surface to a three-dimensional reinforced structure by adding ribs that extend in the circumferential direction. This dimensional enhancement creates additional structural support surfaces that resist deformation under high temperature and pressure, while the ribs are formed as integral parts of the molding process, preserving manufacturing simplicity.
2Strength
If ribs are added to the motor casing to increase strength, then the strength and resistance to deformation are improved, but the device complexity increases
Solution Approach 1:
The ribs are merged with the motor casing as an integral structure formed in a single molding process. This integration eliminates the need for separate manufacturing and assembly steps for the ribs, thereby enhancing strength without increasing device complexity. The ribs and casing become indistinguishable as separate components, maintaining structural simplicity.
Solution Approach 2:
The ribs serve multiple functions simultaneously: they reinforce the casing structure against deformation, provide thermal management pathways, and maintain structural integrity under high pressure. This multi-functionality reduces the need for additional components, thereby increasing strength without proportionally increasing device complexity.
3Strength
If the motor casing is designed with integrated ribs for strength enhancement, then the strength is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The rib structures are pre-planned and pre-positioned within the molding tooling design. By incorporating the rib geometry into the mold cavities before the molding process begins, the casing is formed with built-in reinforcement features that require minimal post-processing. This preliminary action ensures consistent rib formation and reduces the need for high-precision adjustments during manufacturing.
Solution Approach 2:
The molding process parameters are optimized to accommodate the rib structures. By adjusting parameters such as injection pressure, temperature, and cooling rates, the ribs are formed with consistent dimensions and proper structural properties. These parameter changes enable the production of high-strength casings with integrated ribs without requiring excessive manufacturing precision.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5A
AI summary
Provided are: a motor for which high strength can be obtained in a motor casing; and a compressor that uses the motor. This motor 10 has: a rotating shaft 12 provided in a rotatable manner; a rotor 32 that rotates integrally with the rotating shaft 12; a stator 31 that rotationally drives the rotor 32; and a motor casing 14 that is a cylindrical body for accommodating the rotor 32 and the stator 31, and has, on the outer circumferential surface thereof, ribs 22 extending in a circumferential direction.