Modeling of a seven-phase series-connected three-motor drive system

Thavot, Moidu; Iqbal, Atif; Saleh, Mohammad; Kalam, Akhtar

doi:10.1109/ieeegcc.2013.6705765

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…For a traditional three-phase machine, the research on independent control methods of dual-motor systems by single voltage source inverter (VSI) [4][5][6] is increasing. For multi−phase machines, the multi−dimensional freedom of the motor also makes it possible to build a multi−motor drive system using a single inverter [7][8][9]. Compared with multi−inverters, the multi−motor drive control system by single inverter not only reduces the cost of the power device, but also avoids the synchronous communication and command coordination problems of multi−inverters.…”

Section: Introductionmentioning

confidence: 99%

A Flux−Linkage Torque Ripple Suppression Method of Dual−Series FPMSMs Decoupling Control Based on Dual−Frequency Vector Modulation

Sun

Yang

et al. 2022

Energies

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A novel cross−series connection of two five−phase permanent magnet synchronous motors (FPMSM) supplied by single inverter can halve the number of required power units and current sensors. This, along with a decoupling control strategy for FPMSMs in series based on an improved dual−frequency vector modulation (DFV−SVPWM) and a flux−linkage torque ripple suppression method with current compensation are proposed in this paper, each of which have great significance for multi−unit industrial equipment. The third harmonic flux−linkage will produce torque ripple in the FPMSM in series, which has an adverse effect on accuracy. In this paper, a synchronous decoupling mathematical model of dual−series FPMSM with harmonic flux−linkage is established to analyze the decoupling relationship between torque and current. In addition, an enhanced DFV−SVPWM with higher modulation ratio is proposed for the decoupling control of double motors in series. Furthermore, based on the torque influence of two series−connected motors by harmonic flux−linkage and the decoupling control with improved DFV−SVPWM, a torque ripple compensation method with current compensation is proposed, which can effectively suppress the torque ripple of FPMSM with harmonic flux−linkage and not affect the other. The correctness and superiority of the scheme are verified by simulation and experiment in this paper.

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Section: Introductionmentioning

confidence: 99%

A Flux−Linkage Torque Ripple Suppression Method of Dual−Series FPMSMs Decoupling Control Based on Dual−Frequency Vector Modulation

Sun

Yang

et al. 2022

Energies

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“…Recently, the research on the multiphase motor drive system has been done. They are mainly focused on the application of the redundant degrees of freedoms, such as the harmonic current suppression under fault-free condition [2], the harmonic current or voltage injection under fault-free condition [3], the multi-motor series-connected drive system with a single inverter [4,5] and fault-tolerant control [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Position sensorless direct torque control for six‐phase permanent magnet synchronous motor under two‐phase open circuit

Lin

Huang

Jiang

et al. 2019

IET Electric Power Applications

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A position sensor is usually required in the existing fault-tolerant direct torque control (FT-DTC) system for the multiphase permanent magnet synchronous motor (PMSM). Thus, the volume, weight, and cost of the system is increased, and the reliability is decreased. The conventional high-performance position sensorless strategies for the multiphase motor under fault-free condition cannot be directly applied to FT-DTC system. To improve this situation, a high-speed position sensorless FT-DTC strategy for a six-phase symmetrical winding PMSM with two opened phases is proposed in this study. Firstly, modified variables and a new rotating coordinate system are defined to achieve the symmetrical and decoupled mathematical model. Secondly, a stator flux observer based on the modified variables and a new coordinate system is proposed. According to the current model of modified stator flux, the estimated modified stator current can be achieved. Then, the estimated error of the modified stator current is sent to the integrator of the modified stator flux observer to correct the voltage model. Finally, the proposed stator flux observer is applied in FT-DTC for six-phase PMSM with two opened phases to realize the position sensorless operation at high speed. The experimental results verify the feasibility and effectiveness of the proposed strategy.

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“…A symmetrical six-phase machine can be connected in series with a three-phase machine [3]. The research of series-connected five-phase two-motor system has been elaborated in [6][7][8][9][10], as well as the series-connected seven-phase three-motor system [11]. What is more, the realization of the series-connected system is applicable not only to symmetrical but also to asymmetrical multiphase machines.…”

Section: Introductionmentioning

confidence: 99%

Space Vector PWM for Three Series-Connected Permanent Magnet Synchronous Motors Drive System

Zhang

Lu²,

Wang³

et al. 2015

Proceedings of the 2015 International Power, Electronics and Materials Engineering Conference

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Since multiphase machines have more additional degree of freedom than three-phase machine, which can be utilized to control other machines, a number of machines can be controlled independently. The stator windings of the machines can be series connected by an appropriate phase transposition, with the supply coming from a single multiphase inverter. This paper proposed a novel series-connected system, composed of two dual three-phase permanent magnet synchronous motors (PMSMs), one two-phase PMSM and a seven-phase voltage source inverter (VSI) and controlled using space vector PWM. In such a way, independent control of the three series-connected PMSMs is achieved. The simulation results indicated that three machines can operate independently while taking three different loads, supplied from the same seven-phase inverter.

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Modeling of a seven-phase series-connected three-motor drive system

Cited by 7 publications

References 7 publications

A Flux−Linkage Torque Ripple Suppression Method of Dual−Series FPMSMs Decoupling Control Based on Dual−Frequency Vector Modulation

A Flux−Linkage Torque Ripple Suppression Method of Dual−Series FPMSMs Decoupling Control Based on Dual−Frequency Vector Modulation

Position sensorless direct torque control for six‐phase permanent magnet synchronous motor under two‐phase open circuit

Space Vector PWM for Three Series-Connected Permanent Magnet Synchronous Motors Drive System

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