Variable-Gear EV Reluctance Synchronous Motor Drives—An Evaluation of Rotor Structures for Position-Sensorless Control

Villet, W. T.; Kamper, Maarten J.

doi:10.1109/tie.2013.2288231

Cited by 27 publications

(14 citation statements)

References 27 publications

(56 reference statements)

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“…(25) and (27), the maximal torque is obtained when I 3 = I 5 . Moreover, the locus of the current fundamental and harmonics required to achieve a maximal torque per ampere is shown on Fig.…”

Section: Theoretical Aspectmentioning

confidence: 94%

“…Therefore, a renewed interest in reluctance machines has emerged, and in particular in the Synchronous Reluctance Machine (SynRM) from a design point of view as in [5,7,10,11,14,15] and a control point of view as in [27,29,32]. It has been reported that the SynRM delivers competitive results in comparison with the Induction Machine (IM) in [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Torque Ripple Reduction in a Synrm at a Constant Average Torque by Means of Current Harmonics Injection

Yammine¹,

Hénaux²,

Fadel³

et al. 2018

PIER C

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Abstract-This paper studies the impact of current harmonics on the synchronous reluctance machine's average torque and torque ripple. The electromagnetic model of a general m-phase synchronous reluctance machine which integrates the inductance and current harmonics is developed. This model shows that there exist two mechanisms that generate an average torque with a non-zero average value: the proper contribution of the current harmonics and the interaction between them. This model is then used in the case of a 2-phase synchronous reluctance machine with a common transversally laminated anisotropic rotor. This machine design shows negligible inductance harmonics with respect to its fundamental value. Therefore, it has been found that the interaction between the 3rd and 5th current harmonics generates a torque equivalent to the torque generated by the fundamental current component. A locus of the current harmonic components that deliver a constant torque is determined. Furthermore, we have found that, on this locus, the machine torque ripple decreases significantly. Experimental data validate the developed theoretical work and show that at the same torque, the torque ripple is reduced from 20% to 4%.

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Section: Theoretical Aspectmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction in a Synrm at a Constant Average Torque by Means of Current Harmonics Injection

Yammine¹,

Hénaux²,

Fadel³

et al. 2018

PIER C

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show abstract

“…Current is represented as a circle, the voltage required at a particular torque, at any speed, is represented as an ellipse, while the torque is a hyperbola. Utilising (4), (5), tan δ = i qn /i dn , the expression for normalised voltage v n in terms of T n , ω n and δ is given by…”

Section: Mathematical Evaluation Of the Voltage Dip Margin Of A Synrmmentioning

confidence: 99%

Impact of inductance variation on the operation of a synchronous reluctance motor connected to a weak grid

Ghosh¹,

Das²,

Bhuvaneswari³

2020

IET Electric Power Applications

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Changes in inductance profiles of motors from originally designed values are observed due to manufacturing defects and different measurement techniques adopted. This introduces changes in the magnitude of voltage dip that could be tolerated by a synchronous reluctance motor operating at a particular speed and torque while being connected to a weak grid. Since the voltage dip margin is dependent on the inductance of the motor, it changes as per the variations in inductance. This paper proposes a novel methodology to analyse the variations in the voltage dip margin as per the discrepancies in inductances when the motor drive is expected to deliver a particular speed and torque. A control strategy is also proposed to mitigate the ill‐effects of the voltage dip by changing the operating point of the motor. Mathematical expressions are derived showing the voltage dip margin for different degrees of variations in the inductances. It is observed that with reduction in the inductance value, the voltage dip margin increases with increased current, where the current still remains within the maximum current limit of the motor, while the motor is forced to deliver the same speed and torque. The proposed mathematical derivations are validated through simulations and experiments.

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“…As this choice is very critical for the mechanical strength of the rotor core at high speed, it has been decided to fill the flux barriers with epoxy adhesive resin. This technological solution allows to improve the electro-mechanical performance of the machine and to minimize the cross-magnetization effects, thus improving the robustness of a possible sensorless control [7]- [8]. The use of the resin inside the barriers has required an accurate mechanical analysis to verify if the rotor structure was able to withstand the mechanical stress at high speed.…”

Section: Introductionmentioning

confidence: 99%

Synchronous reluctance motors with asymmetric rotor shapes and epoxy resin for electric vehicles

Credo

Villani

Popescu

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper deals with the design of a Synchronous Reluctance motor for full-electric vehicle applications. In particular, the design is focused on premium vehicles and aims at the development of rare-earth free electric motor technologies featuring low cost manufacturing. Different solutions are proposed and compared with focus on the rotor design; the investigated topologies employ asymmetric rotor structures with "fluid shaped" barriers without radial ribs to maximize the average torque and minimize the torque ripple. As this choice is very critical for the mechanical strength of the rotor core at high speed, it has been decided to fill the flux barriers with epoxy adhesive resin. The use of the resin has required an accurate mechanical analysis in order to assess the rotor robustness at high speed. The paper presents the performances of the optimized design and the efficiency and torque ripple maps: moreover, useful information on the use of the epoxy resin in the synchronous reluctance motor are provided.

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Variable-Gear EV Reluctance Synchronous Motor Drives—An Evaluation of Rotor Structures for Position-Sensorless Control

Cited by 27 publications

References 27 publications

Torque Ripple Reduction in a Synrm at a Constant Average Torque by Means of Current Harmonics Injection

Torque Ripple Reduction in a Synrm at a Constant Average Torque by Means of Current Harmonics Injection

Impact of inductance variation on the operation of a synchronous reluctance motor connected to a weak grid

Synchronous reluctance motors with asymmetric rotor shapes and epoxy resin for electric vehicles

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