Compressor
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Solution Overview
Problem
When an Interior Permanent Magnet (IPM) type rotor with a larger eccentric hole is used in a compressor to reduce eccentricity, it can disturb the magnetic flux flow, leading to reduced motor efficiency.
Innovation Solution
A compressor design featuring a rotor core with a shaft, permanent magnets embedded inside, and a stator that causes the rotor core to rotate, where a plurality of eccentric holes are formed on the inner side of a polygonal region to adjust balance and minimize disturbance to the magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the size of the eccentric hole in the rotor core is increased to reduce eccentricity of the rotating body, then the balance adjustment effect is improved, but the magnetic flux flow is disturbed and motor efficiency is reduced
Solution Approach 1:
The patent applies local quality by positioning the eccentric holes specifically within the polygonal region formed by connecting midpoints of permanent magnet sides, rather than distributing them uniformly or placing them in the magnetic flux path areas. This localized positioning ensures that the balance adjustment function is achieved only in the non-critical regions, leaving the magnetic flux flow paths intact and undisturbed.
2Stability of the object's composition
If a separate balance weight is added to reduce eccentricity, then the balance adjustment effect is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the balance weight function with the rotor core structure itself by forming eccentric holes directly in the rotor core. This integration eliminates the need for separate balance weight components, reducing device complexity and manufacturing steps while achieving the same balance adjustment effect. The rotor core serves dual purposes: maintaining magnetic flux flow and providing balance adjustment capability through the strategically positioned eccentric holes.
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 effectively reduces eccentricity of the rotating body and prevents a reduction in motor efficiency by maintaining an undisturbed magnetic flux path, while also eliminating the need for a separate balance weight, thus reducing manufacturing costs.
Implementation Method 1
a stator that causes the rotor core to rotate about the rotation axis
Implementation Method 2
a flow of a magnetic flux that passes through the rotor core
Data Source
AI summary
A compressor includes a shaft that is arranged along a rotation axis a compression unit that drives along with rotation of the shaft, a rotor core that is fixed to the shaft, a plurality of permanent magnets that are embedded inside the rotor core, and a stator that causes the rotor core to rotate about the rotation axis, wherein a plurality of eccentric holes for adjusting balance when the shaft rotates are formed in the rotor core, and the plurality of eccentric holes are formed on an inner side of the polygonal region for which midpoints of sides at a side of the rotation axis among sides formed by side surfaces of the plurality of permanent magnet in a cross section perpendicular to the rotation axis serve as vertices.