Compressor Motor Rotor Balance Weight Positioning
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Solution Overview
Problem
Conventional rotor designs for compressor motors require larger balance weights to achieve centrifugal force, increasing costs and making stable positioning difficult, especially when fixed with a single rivet, leading to inefficiencies and higher costs due to the need for specific shapes and increased size.
Innovation Solution
A rotor design with axial through holes and engagement members between balance weights and rotor end plates allows for stable positioning with three rivets, eliminating the need for large or specially shaped balance weights and preventing rotation during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If balance weights are fixed by a single rivet to reduce cost and simplify structure, then manufacturing cost decreases and structure simplifies, but stable positioning becomes difficult and the balance weight may rotate during operation
Solution Approach 1:
The patent introduces engagement members (protrusions and recesses) as intermediary elements between the balance weight and rotor end plate. These engagement members act as mediators that prevent rotation of the balance weight while being fixed by a single rivet, thus resolving the contradiction between simplified fixation and stable positioning
Solution Approach 2:
The patent segments the positioning function from the fixation function. The single rivet provides fixation while the engagement members (protrusions and recesses) provide positioning. This segmentation allows each element to perform its specific function optimally without interfering with the other
2Force
If balance weights are made larger to achieve predetermined centrifugal force, then centrifugal force increases, but manufacturing cost increases and press molding becomes difficult
Solution Approach 1:
The patent applies local quality by concentrating the mass of the balance weight in specific strategic locations rather than uniformly distributing it. The engagement members and rivet positioning allow for optimized mass distribution that achieves the required centrifugal force with minimal material, making press molding feasible and reducing manufacturing cost
3Stability of the object's composition
If balance weights are made cylindrical and thick to reduce rotation effect, then rotation resistance decreases, but manufacturing cost increases due to press molding difficulty and rotor efficiency decreases due to increased refrigerant gas resistance
Solution Approach 1:
The engagement members (protrusions and recesses) serve as intermediaries that prevent rotation of the balance weight without requiring the balance weight to be thick or cylindrical. This eliminates the need for increased thickness while achieving the same rotation prevention effect, thereby reducing refrigerant gas resistance and manufacturing cost
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 design enables stable positioning of balance weights without additional jigs, reduces costs, and maintains efficiency by preventing rotation, thus enhancing the rotor's performance and cost-effectiveness.
Implementation Method 1
a permanent magnet that is located inside the rotor laminated steel plate to form a plurality of magnetic poles along the circumferential direction with the rotation axis as the center
Implementation Method 2
balance weights that counteract centrifugal force acting on the eccentrically rotating part of the compression mechanism
Data Source
Figure 1
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Figure 3
AI summary
There is provided a rotor of a compressor motor at a low cost in which a balance weight is stably positioned. A rotor includes a rotor laminated steel plate (12), rotor end plates (16, 18) arranged on both end surfaces of the rotor laminated steel plate (12), and balance weights (20, 22) provided on the outer surfaces of the rotor end plates (16, 18), respectively. The rotor laminated steel plate (12) and the rotor end plates (16, 18) are provided with at least three axial through holes (24) that are equally spaced apart in the circumferential direction. The rotor laminated steel plate (12) and the rotor end plates (16, 18) are fixed by three rivets (26a, 26b, 26c) passing through the axial through holes (24), respectively. The balance weight (20) is fixed to the rotor end plate (16) by the two rivets (26a, 26b) of the three rivets. The balance weight (22) is fixed to the rotor end plate (18) by the remaining one rivet (26c), and is positioned by the engagement members (28).