A Survey on the Efficiency Improve of Electrical Machines

Szabó, Loránd

doi:10.1109/iwed.2019.8664220

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…This technical choice is determinant for induction machines as the rotor resistance has a major impact on the machine performances. A lower resistivity of the squirrel cage enables to reduce the rotor Joule losses and to increase the induced currents, leading to a higher torque and a lower rotor temperature, which is one of the main operating limitations for induction machines [14], [15]. However, the rotor manufacturing method is more complicated and expensive as copper melts at a higher temperature than aluminum, which implies to operate at higher temperatures and pressures to make the cage [14], [15].…”

Section: Methodsmentioning

confidence: 99%

“…A lower resistivity of the squirrel cage enables to reduce the rotor Joule losses and to increase the induced currents, leading to a higher torque and a lower rotor temperature, which is one of the main operating limitations for induction machines [14], [15]. However, the rotor manufacturing method is more complicated and expensive as copper melts at a higher temperature than aluminum, which implies to operate at higher temperatures and pressures to make the cage [14], [15]. This explains why this design choice is not very widespread among manufacturers, even though copper die-casting methods are improving.…”

Section: Methodsmentioning

confidence: 99%

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Comparative study of the Tesla Model S and Audi e-Tron Induction Motors

Thomas

Husson

Garbuio

et al. 2021

2021 17th Conference on Electrical Machines, Drives and Power Systems (ELMA)

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Tesla and Audi are two of the most iconic representative of the premium electric vehicles on the market. For their flagship vehicles, the Tesla Model S/X and the Audi e-Tron, the two manufacturers made the same choice to use squirrel cage induction machines. Thus, the paper presents a retro-engineering study of these two motors in order to compare the design strategies made by Tesla and Audi. This comparison is based on two main aspects. The technical design of the two induction motors are firstly compared. Then, the two motors output performances are computed. This study is based on the simulation results of the 2D finite element models of the each machine. Finally, an analysis of the different strategies deployed by the two manufacturers, between technological innovation and cost reduction, is proposed.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Comparative study of the Tesla Model S and Audi e-Tron Induction Motors

Thomas

Husson

Garbuio

et al. 2021

2021 17th Conference on Electrical Machines, Drives and Power Systems (ELMA)

View full text Add to dashboard Cite

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“…Therefore, the development of SPIMs with enhanced efficiency is a challenging task for both designers and manufacturers and is gathering growing research and industrial interest. In order to improve the SPIMs' efficiency, so far, research efforts have focused on (a) the introduction of more accurate magnetic and thermal models for the better estimation of the motor's electromagnetic and thermal behavior [13,14], (b) the optimal rotor squirrelcage design [15][16][17], (c) the proper selection of the rotor bars/stator slots combination for a given number of poles [18], (d) the utilization of manufacturing techniques such as the skewing and inclination of rotor bars [19], (e) the appropriate choice of run-capacitor features (i.e., its optimal value and placement) [20,21], (f) the proposal of novel topologies [22], (g) the testing of advanced electrical steels and conductive alloys for the motor's cores and squirrel-cage, respectively [23,24], and (h) the application of new casting methods [25]. Since most of the above solutions are not easily applicable to mass production, it is essential to have design approaches that provoke slight modifications of the existing SPIMs production procedure, and thus, they have a minimal impact on manufacturers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotor Bars Shape on the Single-Phase Induction Motors Performance: An Analysis toward Their Efficiency Improvement

2022

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Mandatory regulations are published worldwide for the efficiency of line-operated electric motors. The small-sized single-phase induction motors (SPIMs) will not be off the hook in terms of efficiency, since new regulations are scheduled to be introduced regarding them no later than July 2023. By doing so, the efficiency of capacitor-run SPIMs will be forced to exceed the (currently) typical ratings and comply with the requirements of the IE3 (i.e., premium) efficiency class. Since this task is challenging, the already published research works investigated several design, control, and manufacturing aspects. Nevertheless, less attention has been devoted to the study of the rotor bar’s shape impact, both on the SPIMs’ efficiency and starting capability. This gap is filled in this work by examining rotor squirrel-cage configurations with eight different bar shapes for the case of a four-pole/1.0 HP capacitor-run SPIM. A sensitivity analysis, which involves the simultaneous variation of the bar’s cross-sectional area, run-capacitor value, and auxiliary to main winding turns ratio, is performed. The motor’s electromagnetic behavior is estimated through finite element analysis. Through the acquired results, useful directions toward the SPIMs’ efficiency enhancement are provided, while simultaneously conclusions—not found elsewhere—are drawn concerning performance quantities, such as the motor’s starting current, currents shift angle, particular losses, breakdown torque, etc.

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“…When the utilization of the above materials is combined with the proper formation of the stator structure, the iron losses can be minimized and the temperature alleviation can be enhanced 20 . The high quality magnetic materials (ie, electrical steel with high magnetic permeability and low losses density) could be an attractive solution according to Reference 21. However, their cost is prohibitive for low‐power applications.…”

Section: Introductionmentioning

confidence: 99%

A novel design methodology for the compliance of single phase induction motors with recent industrial premium efficiency standards

Chasiotis

Karnavas

2020

Engineering Reports

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The single-phase induction motors (SPIMs) are widely used in several household and industrial applications and thus millions of them are produced every year. Despite the fact that their output power is low, their efficiency enhancement could lead to significant energy savings. The SPIMs are included to the new industrial efficiency standards for commercial motors. Consequently, the minimum efficiency that the SPIMs have to present is that of IE3 (premium-efficiency). The already conducted research efforts have not provided a robust and acceptable-from economical and manufacturing point of view-design procedure toward their efficiency improvement. For this purpose, a novel design methodology is proposed here. It is proven that the required efficiency ratings are achievable with the increment of the motor's axial length, the proper design of the rotor bar slot and the careful selection of the auxiliary to main winding turns ratio along with the value of the used capacitor. Aiming to verify its effectiveness, the presented methodology has been applied to SPIMs with different output power ratings. Moreover, the derived results are compared to the corresponding ones obtained from other design strategies. The motor's nominal performance and its behavior during the start-up phase have been determined through finite element analysis.

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A Survey on the Efficiency Improve of Electrical Machines

Cited by 6 publications

References 41 publications

Comparative study of the Tesla Model S and Audi e-Tron Induction Motors

Comparative study of the Tesla Model S and Audi e-Tron Induction Motors

Effect of Rotor Bars Shape on the Single-Phase Induction Motors Performance: An Analysis toward Their Efficiency Improvement

A novel design methodology for the compliance of single phase induction motors with recent industrial premium efficiency standards

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