The Influence of Strands and Bundle-Level Arrangements of Magnet Wires on AC Losses in the Winding of High — Speed Traction Machine

Bardalai, Anuvav; Xu, Zeyuan; Li, Jing; Gerada, David; Gerada, Chris; Golovanov, Dmitry; Zhang, He

doi:10.23919/icems.2018.8549349

Cited by 12 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An explanation is sought as to why there is this notable difference between the two versions (#3 and #4). A preliminary explanation was presented in [21]. In this paper, a more detailed insight into it is presented.…”

Section: Simulation Resultsmentioning

confidence: 97%

Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines

Bardalai

Gerada

Golovanov

et al. 2020

IEEE Trans. on Ind. Applicat.

Self Cite

View full text Add to dashboard Cite

In the design of electrical machines, the increase of power density has become one of the main research themes. With most of the power loss in high power density electrical machines often being generated in the stator winding assembly, it is necessary to reduce these losses. The effects of strands and bundle positions in the slot on the AC losses in the winding are often overlooked. Taking as a case-study an existing high frequency machine, this paper analyzes and provides an in-depth insight into such effects. Exploiting the rapid advancements in precision 3D printing, it is found and experimentally verified that by controlling the position of the conductors within the top of the slot the AC losses can be markedly reduced.

show abstract

Section: Simulation Resultsmentioning

confidence: 97%

Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines

Bardalai

Gerada

Golovanov

et al. 2020

IEEE Trans. on Ind. Applicat.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, [27] shows that the influence of the magnets on current displacement losses is low. As permanent magnets have a permeability close to air, the magnetic resistance of the magnetic circuit is increased by R ;9A7 C @ A7 /0(D 3 E F A7 )0 due to the permanent magnets.…”

Section: B Modifications Of the Setupmentioning

confidence: 99%

Investigations on the Experimental Identification of AC-Copper Losses in Permanent Magnet Synchronous Machines using a Motor Sub-Assembly

Rollbühler

Peukert

Daniel

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

Analysis of AC copper losses in electrical machines is still a challenging task. Due to high utilization of high power density automotive drives, stray fields in the slots cause a significant copper loss increase compared to DC copper losses. Especially at large cross-sectional areas of the wires up to several times the DC-losses may occur in copper. This paper presents a new method of identifying these additional copper losses in electrical machines directly through measurement and without any finite-element co-simulation, which has not been shown in literature so far. Therefore, a motor sub-assembly consisting of three stator-teeth of an automotive machine and a rotor back iron are manufactured. Different adaptations of the motor sub-assembly are analysed using finite-element software to ensure proper flux-paths and AC copper losses close to the motor. Finally, measurements are performed and discussed.

show abstract

“…The development of the boundary conditions (BCs) ( 22) -(34) will lead to the system of 2ܼ(2 + ݉ ௫ + ݇) + 4ܼ ௦௧ (1 + ݉ ௫ ) + ‫ݍ4‬ linear equations which can be solved to define the unknown coefficients of (11) - (16).…”

Section: Inductance Matrixmentioning

confidence: 99%

Analytical Methodology for Modelling of Circulating Current Loss in Synchronous Electrical Machines With Permanent Magnets

Golovanov

Gerada

2022

IEEE Trans. Energy Convers.

Self Cite

View full text Add to dashboard Cite

This paper describes a novel analytical methodology for modelling winding copper losses as a result of circulating currents (CC) in permanent magnet synchronous machines (PMSM). CCs are important to be considered at an early design stage especially in high frequency and high performance machines where sub-optimal design choices can lead to significant alternating current (AC) losses. Nowadays mainly FEM method is used for precise calculation of circulating currents. However, it suffers on significant computational time required for building models and simulation of circulating current effect that makes it inapplicable for optimization purpose. The paper demonstrates the computationally efficient methodology through comparison with FEM based models for high power density PMSM with concentrated winding and validation against experimental results for a stator section at the fundamental frequency from 500 Hz to 2000 Hz. The methodology allows simulation of CC and AC Ohmic losses when machine supplied by any current waveforms, for arbitrary size and location of the conductors in the slots. A key novelty of the proposed method is the utilization of subdomain (SDM) approach in conjunction with solution of a system of ordinary differential equations (ODE) for an equivalent electrical circuit of machine windings. This approach is precise and fast but has never been used before for circulating current loss evaluation in windings of electrical machines. The model is intended to be used at the design stage of an electrical machine where multiple geometric dimensions, winding configurations and conductor placement in the slot are considered towards an optimal design. Index Terms-Analytical model, circulating current loss, AC loss in electrical machines NOMENCLATURE ܴ ௌଵ , ܴ ௌଶ . . ܴ ௌ Strands resistance ‫ܮ‬ ௌଵ , ‫ܮ‬ ௌଶ . . ‫ܮ‬ ௌ Strands inductance ‫ܧ‬ ଵ , ‫ܧ‬ ଶ . . ‫ܧ‬ bEMFs induced in strands ‫ܯ[‬ ௦௧ ] Square n×n strands inductance matrix ൣ‫ܯ‬ ൧ Rectangular n×x matrix of mutual inductances between machine phases and each strand of investigated coil, x -number of phases [ܴ] Resistance matrix ‫ܫ‬ ଵ . . ‫ܫ‬ Current through each strand ‫ܫ‬ _ଵ . . ‫ܫ‬ _௫ Phase current ݊ Number of parallel strands per coil ܷ Voltage across the terminals of stranded coil ‫ܣ‬ Vector potential in the air gap ‫ܣ‬ ௦ Vector potential in the slot opening ‫ܣ‬ ௦ Vector potential in the slots with bulk coils ‫ܣ‬ ெ Vector potential in the PM subdomain ‫ܣ‬ ௧ , ‫ܣ‬ , ‫ܣ‬ ௧ Vector potentials in the slots with stranded coils ‫ܣ‬ ெ , ‫ܤ‬ ெ , ‫ܥ‬ ெ , ‫ܦ‬ ெ Coefficients for the function of vector potential in PM subdomain ‫ܣ‬ , ‫ܤ‬ , ‫ܥ‬ , ‫ܦ‬ Coefficients for the function of vector potential in the air gap ‫ܣ‬ ௦ , ‫ܤ‬ ௦ , ‫ܣ‬ , ‫ܤ‬ Coefficients for the function of vector potential in the slot opening ‫ܣ‬ ௦ , ‫ܤ‬ ௦ , ‫ܣ‬ , ‫ܤ‬ Coefficients for the function of vector potential in the slots with bulk coils

show abstract

The Influence of Strands and Bundle-Level Arrangements of Magnet Wires on AC Losses in the Winding of High — Speed Traction Machine

Cited by 12 publications

References 5 publications

Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines

Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines

Investigations on the Experimental Identification of AC-Copper Losses in Permanent Magnet Synchronous Machines using a Motor Sub-Assembly

Analytical Methodology for Modelling of Circulating Current Loss in Synchronous Electrical Machines With Permanent Magnets

Contact Info

Product

Resources

About