Optimal Selection of Rotor Bar Number for Minimizing Torque and Current Pulsations Due to Rotor Slot Harmonics in Three-Phase Cage Induction Motors

Joksimović, Gojko; Levi, E.; Kajevic, Aldin; Mezzarobba, Mario; Tessarolo, Alberto

doi:10.1109/access.2020.3045766

Cited by 16 publications

(14 citation statements)

References 29 publications

(62 reference statements)

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“…In the case of a symmetrical three-phase cage induction motor, fed by a symmetrical three-phase AC voltage, the existence of rotor slot harmonics (RSHs) of order  in the stator current spectrum is directly related to the number of rotor bars R and the number of pole pairs p [7], [8]. For =1, we have rotor slot harmonics of the first order, the so-called principal slot harmonics, PSHs.…”

Section: Rotor Slot Harmonics In the Stator Current Spectrum -Mains-f...mentioning

confidence: 99%

“…In contrast, an apparent lack appears in the literature regarding the potentials of acting on the induction motor design to optimize its operation when supplied from a PWM inverter. Recent research, conducted on mains-fed induction motors, has highlighted the importance of an appropriate selection of the number of rotor bars, for example, to minimize Rotor Slot Harmonics (RSHs) and their relevant parasitic effect under sinusoidal supply [7], [8]. The main goal of the paper is to extend the discussion and results presented in [7], [8] covering the case of inverter-fed motors.…”

Section: Introductionmentioning

confidence: 98%

“…Recent research, conducted on mains-fed induction motors, has highlighted the importance of an appropriate selection of the number of rotor bars, for example, to minimize Rotor Slot Harmonics (RSHs) and their relevant parasitic effect under sinusoidal supply [7], [8]. The main goal of the paper is to extend the discussion and results presented in [7], [8] covering the case of inverter-fed motors. The main problem being considered is how some key design choices such as the selection of the number of stator slots and rotor bars, for a given number of poles, can affect the performance of the induction motor when it is fed from a PWM inverter.…”

Section: Introductionmentioning

confidence: 98%

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Stator Current Spectral Content of Inverter-Fed Cage Rotor Induction Motor

et al. 2022

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The paper analyzes the influence of the number of rotor bars on the stator current spectral content in a three-phase cage induction motor fed by a pulse-width modulated (PWM) inverter. It is shown that each of the higher-order time harmonics in the supply voltage produces space harmonics in a rotating magnetic flux density wave, which results in induced rotor slot harmonics (RSHs) in the stator current spectrum. The conditions for the existence of these space harmonics are identical to those applying to a mains-fed motor. In other words, the number of rotor bars of a mains-fed motor yielding an RSH-free stator current spectrum produces the same stator current spectrum even in case the motor is inverter-fed. Additionally, to minimize the adverse effects of RSHs in the stator current spectrum, one must consider not only the number of rotor bars, but also its relationship with the frequency modulation ratio of the PWM inverter. Analytical predictions are presented to illustrate these results supported both by numerical simulations of the induction motor modelled through the winding function theory and experimentally taking the case a two-pole cage induction machine as a case study.

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Section: Rotor Slot Harmonics In the Stator Current Spectrum -Mains-f...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Stator Current Spectral Content of Inverter-Fed Cage Rotor Induction Motor

et al. 2022

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“…The Audi e-Tron SQIM has 48 stator slots and 58 rotor bars while the Tesla machine has 60 stator slots and 74 rotor bars [3], [6], [8]. These combinations satisfy the basic design rules that enable to avoid the potential harmful slot harmonics or mechanical vibrations [12], [13]. Thus, their selection could be linked to a torque ripple minimization study.…”

Section: B Geometrymentioning

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)

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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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“…As the induction motor is a significant consumer of electrical energy globally, more stringent criteria are regularly imposed on its manufacturers, primarily in terms of the efficiency but also in terms of NVH (noise, vibration, harshness) requirements, [4]. Pole changing techniques are inbuilt prosperities of induction motors give it a flexible speed control capability.…”

Section: Introductionmentioning

confidence: 99%

Controlling A Multiphase Induction Motor with Multilevel Converter Paradigm

Zaidan¹

2021

Adv. sci. technol. eng. syst. j.

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Induction motors (IM) are used widely in high energy applications where high torque is required such as ships/ aircrafts manufacturing industry. Those motor drivers are populated in many advantages especially their wide control strategies. However, new technology is invented for enhancing efficiency and smoothing the torque curve by increasing number of phases in the motor drive. Speed control can be achieved by changing the pole numbers between any two different phases using pole-phase modulation (PPM). The problem is raised when a large number of phases are used to enhance the voltage profile. This problem is manifested in the complexity of control and complexity of hardware (more devices need to be involved) which increases the cost and degrades the performance. This paper argues using a multilevel inverter to produce an enhanced voltage profile and motor speed control without needing to increase the number of devices. The performance of the proposed model is compared with conventional models in terms of efficiency, power factor, speed, torque ripple, and ripple frequency. Results obtained using multilevel inverter based induction motors are found optimum.

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Optimal Selection of Rotor Bar Number for Minimizing Torque and Current Pulsations Due to Rotor Slot Harmonics in Three-Phase Cage Induction Motors

Cited by 16 publications

References 29 publications

Stator Current Spectral Content of Inverter-Fed Cage Rotor Induction Motor

Stator Current Spectral Content of Inverter-Fed Cage Rotor Induction Motor

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

Controlling A Multiphase Induction Motor with Multilevel Converter Paradigm

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