Abstract
High-speed permanent magnet (PM) machines are widely used because of their high-power density and high efficiency. The high rotation speed also inevitably subjects the PMs to high centrifugal load, which might damage them due to their inherent mechanical vulnerability, such as a much lower tensile strength than the compressive strength. To robustly transfer the torque from the magnet to the shaft, the outer diameter of the laminated rotor core is larger than the inner diameter of the rotor frame to ensure tight contact while working at 20,000 rpm. Motor manufacturing requires the shrink-fit method to assemble the rotor frame and rotor core. However, after the shrink-fit assembly, unexpected local delamination and buckling are observed on the rotor core part. Utilizing finite element simulation, we study the internal stress of assembling these two parts at the provided interference. Simulation results indicate the reasons for the delamination and buckling of the rotor core part and provide suggestions for improving the assembly.
| Original language | English |
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| Title of host publication | 2024 IEEE Transportation Electrification Conference and Expo, ITEC 2024 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| ISBN (Electronic) | 9798350317664 |
| DOIs | |
| State | Published - 2024 |
| Event | 2024 IEEE Transportation Electrification Conference and Expo, ITEC 2024 - Chicago, United States Duration: Jun 19 2024 → Jun 21 2024 |
Publication series
| Name | 2024 IEEE Transportation Electrification Conference and Expo, ITEC 2024 |
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Conference
| Conference | 2024 IEEE Transportation Electrification Conference and Expo, ITEC 2024 |
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| Country/Territory | United States |
| City | Chicago |
| Period | 06/19/24 → 06/21/24 |
Funding
This material is based upon work supported by the US Department of Energy's (DOE's) Vehicle Technologies Office Electric Drive Technologies Program. The authors thank Ms. Susan Rogers of DOE for her support and guidance. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
Keywords
- buckling
- delamination
- finite element analysis
- high-speed permanent magnet motor
- rotor core