Rotor Holding Sleeve Structure for Simpler Compressor Motor Assembly
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Solution Overview
Problem
The existing electric motors used in electric compressors have a complex assembly process due to the large number of parts, including rotary shafts, end plates, and reinforcing rings, which increases the risk of assembly errors and reduces efficiency.
Innovation Solution
A rotating body design that includes a rotary shaft with flange portions, a cylindrical iron core divided in the circumferential direction, and a holding sleeve with one end fixed to the flange portions, simplifying the assembly by reducing the number of parts and eliminating the need for end plates and reinforcing rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holding sleeve and reinforcing ring structure is used to protect the permanent magnet from centrifugal force, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The holding sleeve is integrated with the rotary shaft to form a unified structure, eliminating the need for separate end plates and reinforcing rings. The holding sleeve extends axially to engage with the rotary shaft, providing both support and protection functions in a single component that reduces assembly complexity.
Solution Approach 2:
The holding sleeve serves multiple functions simultaneously: it supports the permanent magnet assembly, protects against centrifugal forces, and provides structural connection to the rotary shaft. This multi-functional design replaces what would traditionally require multiple separate components.
2Reliability
If multiple constituent members (end plates, reinforcing rings) are used to hold the permanent magnet, then the reliability is improved, but the ease of manufacture deteriorates
Solution Approach 1:
Multiple components (end plates, reinforcing rings, holding sleeve) are merged into a single integrated holding sleeve structure that is directly formed on the rotary shaft, eliminating the need for separate manufacturing and assembly steps for each component.
Solution Approach 2:
The holding sleeve is pre-formed as an integral part of the rotary shaft during shaft manufacturing, so that no separate assembly operation is needed to install the holding structure. The permanent magnet assembly can then be directly installed into the pre-prepared holding sleeve.
3Reliability
If a complex assembly structure with multiple parts is used, then the reliability is improved, but the productivity deteriorates
Solution Approach 1:
The holding sleeve integrates multiple structural functions into a single component, reducing the number of parts that need to be assembled. This simplification directly increases assembly speed while maintaining the structural integrity needed for reliable operation under centrifugal forces.
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 reduces the number of parts and simplifies the assembly process, leading to a more efficient and reliable electric motor for compressors, while also providing enhanced protection against centrifugal forces acting on the permanent magnet.
Implementation Method 1
when the rotor rotates, a centrifugal force acts on the permanent magnet, and there is a concern that the permanent magnet is damaged due to a tensile stress
Data Source
AI summary
In a rotating body, a rotating electric machine, an electric compressor, and a method of manufacturing a rotating body, a rotary shaft having a pair of flange portions provided at an interval in an axial direction, an iron core made of a magnet that has a cylindrical shape, is divided into a plurality of pieces in a circumferential direction, and is disposed between the pair of flange portions on an outer side of the rotary shaft in a radial direction, and a holding sleeve that has a cylindrical shape, is disposed on an outer side of the iron core, and has one end portion and the other end portion in the axial direction fixed to outer peripheral portions of the pair of flange portions are provided.