Abstract
This article concerns the modeling and design of a slitted stator core for single-sided axial-flux permanent-magnet machine application. The stator core is specially designed to maximize the magnetic-flux density in the air gap and to minimize the eddy-current losses occurring at high rotational speeds. To reduce the effort needed for computing the motional eddy-current distribution in the presence of nonlinear material characteristics, a novel method is proposed. It combines the harmonic balance method, which is advantageous for simulating in the frequency domain the steady-state periodic response of a nonlinear system under harmonic excitation, together with a source description that introduces a complex magnetization that mimics the displacement of the permanent-magnet array. Following this method, time-domain distributions and losses can be reconstructed accurately with a low number of harmonics. A 3-D periodic model of the slotless axial-flux machine is built in the framework of isogeometric analysis (IGA) and a mixed formulation is employed, which relies on high-order Nédélec edge elements. The proposed model is embedded into a gradient-based optimization problem to determine the optimal shape of the slits in the stator core of the motor. This results in a novel cost-effective solution for improving the efficiency of axial-flux permanent-magnet machines.
| Original language | English |
|---|---|
| Article number | 8959164 |
| Pages (from-to) | 1-4 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 56 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2020 |
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Keywords
- Eddy currents
- harmonic analysis
- magnetic core
- permanent-magnet machines
- stators
Cite this
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Analysis of motional eddy currents in the slitted stator core of an axial-flux permanent magnet machine. / Friedrich, Léo A.J. (Corresponding author); Gysen, Bart L.J.; Jansen, J.W. (Helm); Lomonova, Elena A.
In: IEEE Transactions on Magnetics, Vol. 56, No. 2, 8959164, 02.2020, p. 1-4.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Analysis of motional eddy currents in the slitted stator core of an axial-flux permanent magnet machine
AU - Friedrich, Léo A.J.
AU - Gysen, Bart L.J.
AU - Jansen, J.W. (Helm)
AU - Lomonova, Elena A.
PY - 2020/2
Y1 - 2020/2
N2 - This article concerns the modeling and design of a slitted stator core for single-sided axial-flux permanent-magnet machine application. The stator core is specially designed to maximize the magnetic-flux density in the air gap and to minimize the eddy-current losses occurring at high rotational speeds. To reduce the effort needed for computing the motional eddy-current distribution in the presence of nonlinear material characteristics, a novel method is proposed. It combines the harmonic balance method, which is advantageous for simulating in the frequency domain the steady-state periodic response of a nonlinear system under harmonic excitation, together with a source description that introduces a complex magnetization that mimics the displacement of the permanent-magnet array. Following this method, time-domain distributions and losses can be reconstructed accurately with a low number of harmonics. A 3-D periodic model of the slotless axial-flux machine is built in the framework of isogeometric analysis (IGA) and a mixed formulation is employed, which relies on high-order Nédélec edge elements. The proposed model is embedded into a gradient-based optimization problem to determine the optimal shape of the slits in the stator core of the motor. This results in a novel cost-effective solution for improving the efficiency of axial-flux permanent-magnet machines.
AB - This article concerns the modeling and design of a slitted stator core for single-sided axial-flux permanent-magnet machine application. The stator core is specially designed to maximize the magnetic-flux density in the air gap and to minimize the eddy-current losses occurring at high rotational speeds. To reduce the effort needed for computing the motional eddy-current distribution in the presence of nonlinear material characteristics, a novel method is proposed. It combines the harmonic balance method, which is advantageous for simulating in the frequency domain the steady-state periodic response of a nonlinear system under harmonic excitation, together with a source description that introduces a complex magnetization that mimics the displacement of the permanent-magnet array. Following this method, time-domain distributions and losses can be reconstructed accurately with a low number of harmonics. A 3-D periodic model of the slotless axial-flux machine is built in the framework of isogeometric analysis (IGA) and a mixed formulation is employed, which relies on high-order Nédélec edge elements. The proposed model is embedded into a gradient-based optimization problem to determine the optimal shape of the slits in the stator core of the motor. This results in a novel cost-effective solution for improving the efficiency of axial-flux permanent-magnet machines.
KW - Eddy currents
KW - harmonic analysis
KW - magnetic core
KW - permanent-magnet machines
KW - stators
UR - http://www.scopus.com/inward/record.url?scp=85078859622&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2019.2953625
DO - 10.1109/TMAG.2019.2953625
M3 - Article
VL - 56
SP - 1
EP - 4
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 2
M1 - 8959164
ER -