Hermetic Compressor Rotor with 3D Magnet Balance
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Solution Overview
Problem
Hermetic compressors experience efficiency loss and increased noise due to rotational imbalance caused by the difference between the center of mass and rotational axis of the rotor, leading to wear in mechanical components and noise generation.
Innovation Solution
A rotor design where permanent magnets are strategically placed around the rotor package at different levels to form a balanced counterweight, eliminating the need for additional balance weights by ensuring symmetrical centrifugal forces through the placement of magnets above and below the magnetic sheets, which are part of the rotor package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If permanent magnets are placed only on the outer peripheral surface of the rotor package, then the rotor structure is simple, but rotational imbalance occurs causing efficiency loss and increased noise
Solution Approach 1:
The patent extends magnet placement from the traditional two-dimensional outer peripheral surface to a three-dimensional configuration that includes positions above and below the rotor package. This dimensional extension allows the magnets to form a balanced counterweight distribution that compensates for rotational imbalance while maintaining structural simplicity.
2Device complexity
If permanent magnets are placed only on the outer peripheral surface of the rotor package, then the rotor structure is simple, but vibrations and noise increase due to imbalance
Solution Approach 1:
The patent strategically positions permanent magnets at specific locations including above and below the rotor package to create a counterweight effect. This counterweight distribution balances the rotational forces, reducing vibrations and noise generated by the imbalance between the center of mass and rotational axis.
3Reliability
If additional balance weights are attached to the rotor, then rotational imbalance is corrected, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the function of permanent magnets with the balance weight function by integrating the magnets directly into the rotor package structure. This eliminates the need for separate additional balance weights, maintaining rotational balance while avoiding increased device complexity and manufacturing cost.
Solution Approach 2:
The permanent magnets serve dual functions: generating the magnetic field necessary for motor operation and simultaneously acting as balance weights to correct rotational imbalance. This multi-functionality eliminates the need for separate balance weight components.
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 achieves automatic balance, reducing vibrations and noise in hermetic compressors without requiring additional balance weights, thereby enhancing the compressor's performance and extending the lifespan of mechanical components.
Implementation Method 1
Some of the permanent magnets placed onto the rotor package are placed with a difference in level so as to be positioned at a higher level than the uppermost magnetic sheet of the rotor package. Some of the remaining permanent magnets are placed onto the rotor package so as to be positioned at a lower level than the level of the lowermost magnetic sheet of the magnetic sheets forming the rotor package
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a rotor (1) comprising a rotor package (3) with a cylindrical outer form composed of magnetic sheets placed between a lower magnetic sheet (7) and an upper magnetic sheet (6); and a plurality of permanent magnets (4) placed so as to surround the outer surface of the rotor package (3), and also relates to a hermetic compressor (2) comprising said rotor (1).