Analysis of eddy current losses in the stator windings of IPM machines in electric and hybrid electric vehicle applications

Paradkar, Milind; Böcker, Joachim

doi:10.1049/cp.2016.0320

Cited by 13 publications

(4 citation statements)

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“…When the dimension of one stator slot is determined, an increase in the turn of windings per slot can suppress the eddy current loss generated by the magnetic flux ψ2 effectively because the cross-sectional area of each turn decreases. However, increasing the turn of windings will lead to an increase in voltage and a decrease in current for a specific operating point [14] [15]. Although it is desirable to increase the turn of windings per slot as much as possible, it should be noted that the voltage should be less than or equal to 400 Vrms to ensure that the IPMSG can be easily driven by a mass-produced inverter.…”

Section: Structure Of Basic Model Employing Special Rectangular Windingsmentioning

confidence: 99%

Reduction in Eddy Current Loss of Special Rectangular Windings in High-Torque IPMSM Used for Wind Generator

et al. 2023

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A special rectangular winding structure, which has different cross-sectional shape but the same cross-sectional area for each turn, has been adopted in a high-torque IPMSM used for a wind generator to improve slot factor and heat dissipation. However, large eddy current loss occurs to the rectangular windings. According to this problem, this paper proposes three improvements to reduce the eddy current loss. Among them, removing a portion of windings and replacing a portion of windings with aluminum are discussed to realize a tradeoff between eddy current and copper losses. And adjusting the tooth-tip shape is discussed to suppress the magnetic flux passing through the windings by mitigating magnetic saturation around the tooth-tip. Additionally, manufacturing costs can also be reduced by adopting a portion of aluminum windings. Moreover, a 3-step-skewed rotor structure is discussed to reduce cogging torque and lower the start-up wind speed. And its influence on losses is also discussed. Furthermore, three models adopting round windings are made and discussed for comparison. The FEM (Finite Element Method) results show that compared with the three round windings models, the proposed model still has a better performance in the reduction of windings eddy current loss. Finally, a prototype machine is manufactured to verify the FEM results, and the experimental results show that the maximum efficiency of the prototype can exceed 97.5%.

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Section: Structure Of Basic Model Employing Special Rectangular Windingsmentioning

confidence: 99%

Reduction in Eddy Current Loss of Special Rectangular Windings in High-Torque IPMSM Used for Wind Generator

et al. 2023

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“…The calculation of K was first performed by Field, then Emde, Rogowski, Roth, Dreyfus and others [28][29][30][31][32][33][34][35][36][37][38][39]. The main results of his work are presented below.…”

Section: Additional Losses In the Barmentioning

confidence: 99%

Concept, Feasibility of Cylindrical Bar Winding for Low Voltage Permanent Magnet Synchronous Motor

et al. 2022

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In this paper, we present the use of a solid bar winding for a permanent magnet synchronous motor dedicated to the electric drive of a full electric boat. For the winding, we chose to use cylindrical bars for the electric vehicle motorizations of a power lower than 10 kW. The choice of a 60 VDC low-voltage power distribution requires resorting to a solid bar winding with one bar per slot (single turn). Hence, the solid conductors dissipate additional copper losses (higher AC resistance). An analysis of these additional copper losses was carried out to accurately assess the effective AC resistance of the winding and, hence, the efficiency of the electric motor. A prototype for a POD propulsion was designed, built and tested. The characteristics of its electric motor were presented. The feasibility this type of cylindrical bar winding has been proven. A study on the optimization of the slot has demonstrated the performance of this type of winding.

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“…In a study described in [20], AC losses were computed for a PMa-SynRM employing stranded wire conductors. In [21], a group of researchers conducted a detailed analytical examination of the eddy current losses occurring in the stator windings of an interior permanent magnet (PM) machine. Their study specifically focused on a multi-strand coil configuration.…”

Section: Introductionmentioning

confidence: 99%

Winding Loss Suppression in Inverter-Fed Traction Motors via Hybrid Coil Materials and Configurations

Selema,

Tawfiq,

Ibrahim

et al. 2023

Applied Sciences

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In a typical inverter-fed AC drive system, the stator windings carry a current with a large harmonics content, resulting in an increased AC loss. In this paper, the additional copper losses caused by non-sinusoidal currents are investigated for different magnet wire topologies, including the flat conductor, stranded, and litz wires. Also, a two-slot simplified model is introduced for accurate prediction of the AC losses at high frequency. It is found that one of the major issues of the conventional copper coil is that the losses are not uniformly distributed across the slot, and over 70% of the losses are concentrated near the slot opening. Moreover, using the transient finite element method, different winding topologies and arrangements are simulated at the stranded level to evaluate the losses and current density for each strand under highly distorted currents. Furthermore, different coil samples are prototyped for the same slot geometries to compare their performance under the same pulse-width modulation (PWM) waveforms for a wide range of frequencies. Finally, new hybrid coil topologies are proposed, which employ different magnet wires or materials within the same slot. The results demonstrate that utilizing a mixed wire configuration can effectively mitigate the adverse effects of eddy current losses. This approach can yield up to 16–41% lower losses while also achieving a weight savings of 36–70%.

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Analysis of eddy current losses in the stator windings of IPM machines in electric and hybrid electric vehicle applications

Cited by 13 publications

References 0 publications

Reduction in Eddy Current Loss of Special Rectangular Windings in High-Torque IPMSM Used for Wind Generator

Reduction in Eddy Current Loss of Special Rectangular Windings in High-Torque IPMSM Used for Wind Generator

Concept, Feasibility of Cylindrical Bar Winding for Low Voltage Permanent Magnet Synchronous Motor

Winding Loss Suppression in Inverter-Fed Traction Motors via Hybrid Coil Materials and Configurations

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