Influence of Design Parameters on the Airgap Induction of Five-Phase Induction Machines Operating With One Phase Opened
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Influence of Design Parameters on the Airgap Induction of Five-Phase Induction Machines Operating With One Phase Opened Luís A. Pereira1
· Guilherme Nicol1 · Luís F. A. Pereira1 · Matheus Perin1
Received: 3 March 2020 / Revised: 3 March 2020 / Accepted: 9 May 2020 © Brazilian Society for Automatics–SBA 2020
Abstract This paper addresses the relation between some constructive parameters of five-phase induction machines and the airgap induction distribution under operation with one phase opened; we focus on the impact of design parameters on the airgap induction and the Joule losses. The influence of design parameters of the rotor and the stator is assessed using three distinct machines as a case study: two with identical stator but different rotors, and one with a distinct stator and also a distinct rotor. The results from the case study show that the characteristics of the stator windings, such as the number of slots per pole and phase and the number of layers, have less impact on the airgap induction under fault than under healthy operation. Besides, the case study shows that a decrease in the number of rotor bars contributes to an increase in the amplitude of the third harmonic component of the airgap induction. Finally, theoretical results are validated through analysis with the finite element method.
1 Introduction Over the past three decades, machines with more than three phases, also known as high-phase machines (HPMs), have been the focus of intensive research work due to their advantages over three-phase machines. The most remarkable advantages of HPMs are the improved resilience and the possibility of using the higher harmonic waves of the airgap induction to increase the torque capability and the torque/volume ratio. For instance, the third harmonic airgap induction can be used to flatten the airgap induction distribution, so that the fundamental induction can increase, thus improving the torque capability (Toliyat et al 1991). Based on this concept, several control strategies have been proposed which impose the required third harmonic to the airgap induction through a current-controlled converter (Scharlau et al
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Luís A. Pereira [email protected] Guilherme Nicol [email protected] Luís F. A. Pereira [email protected] Matheus Perin [email protected]
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Graduate Program on Electrical Engineering (PPGEE), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 90035-190, Brazil
2008; Mengoni et al 2015; Abdel-Khalik et al 2012; Zheng et al 2008; Kong et al 2016; Zhu et al 2017; Wang et al 2015). Besides, the saturation of the magnetic parts can also contribute to the harmonic content of the airgap induction, as demonstrated in Pereira et al (2012), where the authors assessed the effects of the third harmonic induction produced by saturation on the airgap induction, along with the effects of the saturation level of the stator teeth and yoke. In general, feeding three-phase machines with squarewave voltages results in currents with high harmonic content and excessive pulsating t
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