High Efficiency PMSM With High Slot Fill Factor Coil for Heavy-Duty EV Traction Considering AC Resistance

Chin, Jun-Woo; Cha, Kyoung-Soo; Park, Min-Ro; Park, Soo-Hwan; Lee, Eui-Chun; Lim, Myung-Seop

doi:10.1109/tec.2020.3035165

Cited by 31 publications

(5 citation statements)

References 38 publications

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“…The uneven current distribution in the electric machines' windings is mainly due to the time-varying magnetic flux leakage in the slots [8], [41]. The skin and the proximity effects caused by the slot flux leakage reduce the active cross-section of the conductors in the slots, thus increasing the AC resistance and copper loss [42].…”

Section: B Copper Lossmentioning

confidence: 99%

Innovations in Axial Flux Permanent Magnet Motor Thermal Management for High Power Density Applications

Jenkins

Jones-Jackson

Zaher

et al. 2023

IEEE Trans. Transp. Electrific.

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At the forefront is the challenging design of electric motors with high efficiencies, torque, and power capabilities. Due to its high performance, the Axial Flux Permanent Magnet (AFPM) Motor is expected to be one of the leading technologies to meet the demands of these industries. Finding the balance between the cooling system's effectiveness and subsequent parasitic losses is key to utilizing these performance benefits.Single stator double rotor topologies achieve the best torque density and lower stator losses, however are more challenging to cool as the stator is in the center of the motor. Single stator single rotor and double stator machines are less challenging to cool but typically have lower power density. Rotor air cooling is discussed including the effectiveness of blades, meshes, and vents which can be optimized to prevent demagnetization. Stator cooling is critical as many machines maximize current density C. Jenkins,

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Section: B Copper Lossmentioning

confidence: 99%

Innovations in Axial Flux Permanent Magnet Motor Thermal Management for High Power Density Applications

Jenkins

Jones-Jackson

Zaher

et al. 2023

IEEE Trans. Transp. Electrific.

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show abstract

“…The formula used to calculate homogenization is Equation (2). Where f ill is the fill factor (ratio between the area of conductors and the slot area), k a is thermal conductivity of the surrounding material and k con is thermal conductivity of the copper conductors.…”

Section: Homogenizationmentioning

confidence: 99%

“…One of the most utilized types of electrical motors in the automotive industry is a permanent magnet synchronous motor (PMSM). In recent years, research and development of PMSM for automotive electric traction machines have greatly intensified [1][2][3][4]. One of the commonly used construction typologies of PMSM in the automotive industry is a machine with tooth-coil winding or a machine with concentrated winding.…”

Section: Introductionmentioning

confidence: 99%

A Complex Study of Stator Tooth-Coil Winding Thermal Models for PM Synchronous Motors Used in Electric Vehicle Applications

et al. 2021

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The operational reliability and high efficiency of modern electrical machines depend on the ability to transfer heat in the construction parts of the machine. Therefore, many authors study various thermal models and work on the development of effective heat dissipation. New insights and methods lead to improved techniques for the thermal design of electrical machines. This paper presents an experimentally validated thermal model of a permanent magnet synchronous motor (PMSM) with an improved slot winding model. It also deals with various approaches to homogenization and equivalent material properties of a tooth-coil winding sub-model. First, an algorithm for building a lumped-parameter thermal network (LPTN) of PMSM is described and its properties and problems are discussed. Subsequently, a sub-model of a slot with a winding based on the finite element method (FEM) is introduced. This sub-model is able to generate different conductor distributions based on probabilistic methods for a specified fill factor. This allows the verification of various homogenization approaches and at the same time it is a tool that automatically calculates thermal resistances for the LPTN.

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“…As a result, interior permanent magnet (IPM) motors are commonly used for traction systems of electric vehicles and industrial applications. The rapid growth of the implementation of the IPM motors is due to their highly efficient and large power-energy density [6,7]. However, the IPM motor drive poses several challenges, such as dealing with magnetic saturation, demagnetization of the permanent magnets, cross-coupling between the dand q-axes within the controller, and the influence of time and space harmonics on the effectiveness of vector control [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Improved Current and MTPA Control Characteristics Using FEM-Based Inductance Maps for Vector-Controlled IPM Motor

et al. 2023

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Some major problems in the motor drive are the overshoot or undershoot of transient response characteristics and a parameter mismatch due to magnetic saturation. This study proposed a 3D inductance map combined with a maximum-torque-per-ampere (MTPA) map based on a finite-element (FE) motor model considering a cross-coupling magnetic saturation impact to overcome this problem. The proposed FE motor model has a high accuracy of no-load back electromotive force (e.m.f.) around 98.3% compared to the measurement results. Then, nine scenarios of vector control combinations of inductance maps and current supply variations of β 0°, 45°, and MTPA were investigated. As a result, the transient response improvement for β 0°, 45°, and MTPA without the map and with Ld and Lq maps is 63%, 10%, and 15%, respectively. Moreover, for the steady-state response, the average torque improvement between MTPA and Idref 0 A control is 9.21%, 8.97%, and 8.98% for the no-map, ave-map, and 3D-inductance-map conditions, respectively. The MTPA trajectory characteristic was also updated to illustrate the actual MTPA condition compared to the conventional MTPA control. In detail, the proposed method has reduced the parameter mismatch for the current control loop in the transient state and improved the MTPA control trajectory for the steady-state response. Finally, the improvement of vector control characteristics of the proposed method was verified by an FE simulation and experimental measurement results.

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High Efficiency PMSM With High Slot Fill Factor Coil for Heavy-Duty EV Traction Considering AC Resistance

Cited by 31 publications

References 38 publications

Innovations in Axial Flux Permanent Magnet Motor Thermal Management for High Power Density Applications

Innovations in Axial Flux Permanent Magnet Motor Thermal Management for High Power Density Applications

A Complex Study of Stator Tooth-Coil Winding Thermal Models for PM Synchronous Motors Used in Electric Vehicle Applications

Improved Current and MTPA Control Characteristics Using FEM-Based Inductance Maps for Vector-Controlled IPM Motor

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