Rotor Core Rib Geometry for Strength and Flux Leakage Balance
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Solution Overview
Problem
Existing rotor designs face challenges in optimizing the dimensions of ribs between through holes to balance strength and magnetic flux leakage, particularly in withstanding centrifugal forces during high-speed operation while minimizing magnetic flux leakage.
Innovation Solution
The rotor core incorporates a configuration with three ribs, where one central rib is narrower and parallel to the magnetic pole centerline, and two distant ribs are wider with larger inclinations, optimizing rib dimensions to reduce bending forces and magnetic flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ribs are made wider to increase strength, then the rotor can withstand centrifugal forces better, but magnetic flux leakage increases
Solution Approach 1:
The patent applies local quality by making the first rib (central rib) narrower than the second and third ribs (distant ribs). The first rib has a smaller width in the radial direction, reducing magnetic flux leakage in the central region where flux leakage is most harmful. The second and third ribs have larger widths to provide sufficient strength for withstanding centrifugal forces. This non-uniform rib width distribution optimizes both strength and magnetic flux leakage reduction locally in different regions of the rotor core.
2Object-generated harmful factors
If the ribs are made narrower to reduce magnetic flux leakage, then magnetic efficiency improves, but the rotor's ability to withstand centrifugal forces decreases
Solution Approach 1:
The patent applies local quality by making the first rib (central rib) narrower than the second and third ribs (distant ribs). The first rib has a smaller width in the radial direction, reducing magnetic flux leakage in the central region where flux leakage is most harmful. The second and third ribs have larger widths to provide sufficient strength for withstanding centrifugal forces. This non-uniform rib width distribution optimizes both strength and magnetic flux leakage reduction locally in different regions of the rotor core.
3Ease of manufacture
If all ribs have equal width, then manufacturing is simplified, but optimal balance between strength and magnetic efficiency is not achieved
Solution Approach 1:
The patent applies local quality by making the first rib (central rib) narrower than the second and third ribs (distant ribs). The first rib has a smaller width in the radial direction, reducing magnetic flux leakage in the central region where flux leakage is most harmful. The second and third ribs have larger widths to provide sufficient strength for withstanding centrifugal forces. This non-uniform rib width distribution optimizes both strength and magnetic flux leakage reduction locally in different regions of the rotor core.
Solution Approach 2:
The patent applies asymmetry by creating non-uniform rib widths where the first rib (central rib) has a different width compared to the second and third ribs (distant ribs). The first rib is narrower in the radial direction, while the second and third ribs are wider. This asymmetric configuration optimizes the balance between reducing magnetic flux leakage in the central region and maintaining sufficient strength in the outer regions, moving away from the symmetric equal-width design.
Data Source
AI summary
A rotor includes a core and two or more ribs. The core has a through hole group that includes three or more through holes arranged in a circumferential direction. The through hole group is formed through a predetermined magnetic pole. The two or more ribs are configured as portions of the core, with each rib being interposed between adjacent through holes. A first of the ribs has a first inclination with respect to a magnetic pole centerline. A second of the ribs has a second inclination with respect to the magnetic pole centerline. The second inclination is larger than the first inclination. The magnetic pole centerline is a straight line that passes through a radial center line of the magnetic pole and an axial center of the rotor. The first rib is narrower than the second rib.