Details
| Original language | English |
|---|---|
| Title of host publication | 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 662-669 |
| Number of pages | 8 |
| ISBN (electronic) | 9781728170190 |
| ISBN (print) | 978-1-7281-7018-3, 978-1-7281-7020-6 |
| Publication status | Published - 2020 |
| Event | 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020 - Sorrento, Italy Duration: 24 Jun 2020 → 26 Jun 2020 |
Abstract
This paper describes the effects of skewing the rotor of a permanent magnet synchronous machine (PMSM) with buried magnets by torsion of the soft-magnetic rotor active part and maintaining the magnet pockets axially straight. The impact of this approach on the mechanical and the electromagnetic design of the rotor active part is presented. In the end, the approach leads to a reduced cogging torque with simultaneously decreased leakage flux. Using conventional manufacturing technologies, e.g. punching or laser cutting, skewing the laminated soft-magnetic rotor active part and maintaining the magnet pockets axial straight would lead to a variety of lamination cross sections. The presented approach can hence be realized usefully by means of Additive Manufacturing (AM) technologies.Therefore, a short review of metal-additive manufacturing in the field of electric machines and the common practice of skewing in PMSMs is given in a first step. After this, a PMSM with barshaped buried magnets was chosen to serve as reference. 3D electromagnetic finite element analyses (FEA) of the non-skewed reference machine, of a conventionally step-skewed rotor and of the new continuously skewed rotor concept are performed. Continuously twisting the rotor active part around the magnet pockets leads to the need of adjusting the stray paths flanking the magnet pockets. The trade-off between minimizing leakage flux and maximizing mechanical strength is pointed out and the outcome additional mechanical stress FEA is shown. The impact of the stray paths and the skewing angle on the rotor air-gap flux density distribution is investigated in detail which leads to the evaluation of the resulting cogging torque of the different rotor concepts. Finally, guidelines for designing continuously skewed PM rotors using the possibilities of AM technologies can be derived.
Keywords
- Additive Manufacturing, Finite Element Analysis, Permanent Magnet Synchronous Machine, Skewing
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Electrical and Electronic Engineering
- Engineering(all)
- Mechanical Engineering
- Mathematics(all)
- Control and Optimization
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2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020. Institute of Electrical and Electronics Engineers Inc., 2020. p. 662-669 9161932.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Effects of continuous rotor skewing in additively manufactured permanent magnet rotors
AU - Urbanek, Stefan
AU - Keuter, Ralf
AU - Peter, Emma
AU - Ponick, Bernd
N1 - Funding Information: This work was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG).
PY - 2020
Y1 - 2020
N2 - This paper describes the effects of skewing the rotor of a permanent magnet synchronous machine (PMSM) with buried magnets by torsion of the soft-magnetic rotor active part and maintaining the magnet pockets axially straight. The impact of this approach on the mechanical and the electromagnetic design of the rotor active part is presented. In the end, the approach leads to a reduced cogging torque with simultaneously decreased leakage flux. Using conventional manufacturing technologies, e.g. punching or laser cutting, skewing the laminated soft-magnetic rotor active part and maintaining the magnet pockets axial straight would lead to a variety of lamination cross sections. The presented approach can hence be realized usefully by means of Additive Manufacturing (AM) technologies.Therefore, a short review of metal-additive manufacturing in the field of electric machines and the common practice of skewing in PMSMs is given in a first step. After this, a PMSM with barshaped buried magnets was chosen to serve as reference. 3D electromagnetic finite element analyses (FEA) of the non-skewed reference machine, of a conventionally step-skewed rotor and of the new continuously skewed rotor concept are performed. Continuously twisting the rotor active part around the magnet pockets leads to the need of adjusting the stray paths flanking the magnet pockets. The trade-off between minimizing leakage flux and maximizing mechanical strength is pointed out and the outcome additional mechanical stress FEA is shown. The impact of the stray paths and the skewing angle on the rotor air-gap flux density distribution is investigated in detail which leads to the evaluation of the resulting cogging torque of the different rotor concepts. Finally, guidelines for designing continuously skewed PM rotors using the possibilities of AM technologies can be derived.
AB - This paper describes the effects of skewing the rotor of a permanent magnet synchronous machine (PMSM) with buried magnets by torsion of the soft-magnetic rotor active part and maintaining the magnet pockets axially straight. The impact of this approach on the mechanical and the electromagnetic design of the rotor active part is presented. In the end, the approach leads to a reduced cogging torque with simultaneously decreased leakage flux. Using conventional manufacturing technologies, e.g. punching or laser cutting, skewing the laminated soft-magnetic rotor active part and maintaining the magnet pockets axial straight would lead to a variety of lamination cross sections. The presented approach can hence be realized usefully by means of Additive Manufacturing (AM) technologies.Therefore, a short review of metal-additive manufacturing in the field of electric machines and the common practice of skewing in PMSMs is given in a first step. After this, a PMSM with barshaped buried magnets was chosen to serve as reference. 3D electromagnetic finite element analyses (FEA) of the non-skewed reference machine, of a conventionally step-skewed rotor and of the new continuously skewed rotor concept are performed. Continuously twisting the rotor active part around the magnet pockets leads to the need of adjusting the stray paths flanking the magnet pockets. The trade-off between minimizing leakage flux and maximizing mechanical strength is pointed out and the outcome additional mechanical stress FEA is shown. The impact of the stray paths and the skewing angle on the rotor air-gap flux density distribution is investigated in detail which leads to the evaluation of the resulting cogging torque of the different rotor concepts. Finally, guidelines for designing continuously skewed PM rotors using the possibilities of AM technologies can be derived.
KW - Additive Manufacturing
KW - Finite Element Analysis
KW - Permanent Magnet Synchronous Machine
KW - Skewing
UR - http://www.scopus.com/inward/record.url?scp=85091132037&partnerID=8YFLogxK
U2 - 10.1109/speedam48782.2020.9161932
DO - 10.1109/speedam48782.2020.9161932
M3 - Conference contribution
AN - SCOPUS:85091132037
SN - 978-1-7281-7018-3
SN - 978-1-7281-7020-6
SP - 662
EP - 669
BT - 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020
Y2 - 24 June 2020 through 26 June 2020
ER -