Investigation and Analysis of Novel Skewing in a 140 kW Traction Motor of Railway Cars That Accommodate Limited Inverter Switching Frequency and Totally Enclosed Cooling System

Jang, Hyungkwan; Kim, Hyun Woo; Nam, Dong-Woo; Kim, Won‐Ho; Lee, Ju; Jin, Chang-Sung

doi:10.1109/access.2021.3109267

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…With reference to above method, if the n-th harmonic of back-EMF (N th ) is targeted rather than the cogging torque, the optimal skew angle to minimize the magnitude of N th can be obtained. Since N th corresponds to the cycle of the cogging torque, optimal skew angle (electric angle, θ har(e) ) can be expressed as (10) in PMSM [18], [20]. In the case of MG-PMSM, unlike conventional PMSM, it contains pole-pieces, which also rotate in the same direction and different speed as the inner rotor.…”

Section: B Rotors Skew In Mg-pmsmmentioning

confidence: 99%

“…However, MG-PMSM also has a disadvantage, which is that the THD in back-EMF is higher than that of other motors. The harmonics of the back-EMF make accurate position control difficult and adversely affect torque ripple [18]. There are three representative factors that increase the THD in back-EMF of MG-PMSM: magnetic flux modulation effect, salient outer permanent magnet structure, and FSCW [19].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Optimal Rotors Skew to Improve the Total Harmonic Distortion of Back Electromotive Force in MG-PMSM for Traction

Jo,

Lee,

Lee

et al. 2023

IEEE Access

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This paper presents optimal rotor permanent magnet (PM) and rotor pole-piece skew to improve the total harmonic distortion (THD) of the back electromotive force (Back-EMF) in magnetic geared permanent magnet synchronous motor (MG-PMSM) for traction. MG-PMSM is a system that integrates a magnetic gear and a PMSM which can minimize the size of the driving system and reduce power loss because there is no mechanical friction unlike the existing motor. For this reason, it is more advantageous in terms of output density and efficiency. However, MG-PMSM has a pole-piece rotor for magnetic flux modulation, which can produce additional spatial harmonics in back electromotive force (back-EMF). In addition, this motor has inevitable to have a salient permanent magnet structure for the stator due to magnet loss, and in the case of winding methods, fractional slot concentrated winding (FSCW) is mainly used, which also causes additional harmonics. THD in back-EMF adversely affects torque ripple and make accurate position control difficult. Therefore, in this paper, THD in back-EMF is reduced by focusing on the optimal rotors skew. Considering the characteristics of MG-PMSM, skew is applied to each rotor, and then compared and analyzed with the proposed model.

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Section: B Rotors Skew In Mg-pmsmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Optimal Rotors Skew to Improve the Total Harmonic Distortion of Back Electromotive Force in MG-PMSM for Traction

Jo,

Lee,

Lee

et al. 2023

IEEE Access

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“…Based on (15), the currents in the other subcondcutors such as n/2-1 and n/2 are listed in Table III. For the circuit design, the current excitation for each conductor is considered as sinusoidal, thus in real-life application, when an inverter is used, due to the PWM frequency, the current distribution in the conductors and the AC losses will vary.…”

Section: Table III Current In Different Subcondcutors Subconductorsmentioning

confidence: 99%

Computationally Efficient Stator AC Winding Loss Analysis Model for Traction Motors Used in High-Speed Railway Electric Multiple Unit

Han

Seo²,

Paul

et al. 2022

IEEE Access

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The aim of this proposed work is to develop a computationally efficient and accurate AC winding loss analysis model for the traction motors for use in high-speed railways (HSRs). The goal of the model is to be able to study AC winding loss under both sinusoidal and pulse width modulated (PWM) inverter voltage sources. The traction motor model considered for the proposed study is a form wound winding permanent magnet (PM) assisted synchronous reluctance motor (PMaSynRM). The traction motor uses an open slot with two-layer winding. First, a flux linkage table is built using finite element analysis (FEA) with sinusoidal current as the input. The machine model then includes the effect of the PWM inverter voltage source with the current controller. For the AC winding loss analysis, the fundamental component and the harmonics due to PWM are considered separately. To find the loss due to the fundamental component only, the vector potential of the slot region is mapped to the subconductors of the form wound winding and the eddy current distribution and the AC winding loss are calculated. The effect of the harmonics due to the PWM switching is then added in the post-processing stage by analytically evaluating the individual harmonic effect. The whole AC loss analysis model proposed in this work is computationally more efficient than the conventional FEA because the transient state of the system is removed. Moroover, the PWM voltage source effect is divided into the effects of the fundamental component and switching harmonics by combining the vector potential mapping and post-processing analytical calculation.

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“…Regarding the thermos-hydraulic analysis and design of power electronics cooling system, in the literature, there are studies on the single components, mainly based on two different types of tools: analytical models with lumped-parameter networks (LP) [5], and numerical simulation tools, also divided into finite-element methods (FEMs) [6], [7] and computational fluid dynamics (CFD) [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Predictive model of cooling system for railway electric propulsion: validation of design choices and last mile analysis

Rosa

Belli²,

Frosina

et al. 2022

J. Phys.: Conf. Ser.

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For many years the most advanced railway propulsion systems have been based on the use of electric motors. Compared to the other available solutions, these are characterized by greater operating economy and less environmental pollution. In order to operate as efficiently as possible and to guarantee the high standards of electromechanical reliability, these propulsion technologies need adequate cooling systems to operate in controlled temperature conditions. Considering this, the implementation of increasingly accurate and performing simulation models can represent a significant advantage and provide great support in the optimization phase of cooling systems, in terms of reduction of dimensions and weight, rapid and low-cost experimentation, prediction of critical scenarios and choice of the best solution strategies to be taken. In this regard, in the context of the collaboration between the University of Naples Federico II, University of Sannio and the company Hitachi Rail STS S.p.A., several lumped parameter models of power converter cooling systems for railway electric propulsion were developed in the Simcenter AMESim environment. These models allowed to validate specific design choices from thermal and hydraulic perspectives, aimed at higher energy efficiency of the system, and to perform the so-called Last Mile predictive analysis, in order to evaluate the possibility of removing a vehicle from the railway line as consequence of a fault of specific components.

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Investigation and Analysis of Novel Skewing in a 140 kW Traction Motor of Railway Cars That Accommodate Limited Inverter Switching Frequency and Totally Enclosed Cooling System

Abstract: This paragraph of the first footnote will contain support information, including sponsor and financial support acknowledgment.

Cited by 8 publications

References 33 publications

Analysis of Optimal Rotors Skew to Improve the Total Harmonic Distortion of Back Electromotive Force in MG-PMSM for Traction

Analysis of Optimal Rotors Skew to Improve the Total Harmonic Distortion of Back Electromotive Force in MG-PMSM for Traction

Computationally Efficient Stator AC Winding Loss Analysis Model for Traction Motors Used in High-Speed Railway Electric Multiple Unit

Predictive model of cooling system for railway electric propulsion: validation of design choices and last mile analysis

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