Stability analysis of a series-connected five-phase induction motor drive system using flux-linkage model

Islam, Shirazul; Iqbal, Atif; Bakhs, Farhad I.; Saleh, Mohammad; Kalam, Akhtar

doi:10.1109/iciea.2013.6566410

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…To enhance the reduction in high starting current of the machine due to the high slip value during starting period, an externally applied resistance is injected into the rotor terminal as shown in Figure 2. Thus, the rotor voltage equation under this condition changes to (7) to (8):…”

Section: Method: Modelling Of the Six-phase Squirrel Cage Induction M...mentioning

confidence: 99%

“…Amongst the new emergent challenges, multiphase induction machines are considered the most promising solution for renewable energy applications [5]. Multiphase drives possess some advantageous features as compared to the conventional three-phase drives which include reduction in the amplitude of torque pulsation, better fault tolerance, higher efficiency, lower current ripple or reduction in the rotor harmonic current and the ease to split certain magnitude of power into multiple phases to reduce the power stress per phase [6], [7]. This power splitting enhances the proper use of the devices of less rating in case of moderate power application process [7].…”

Section: Introductionmentioning

confidence: 99%

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Multi-phase inverter-controlled induction machine at varied rotor parameters

Omeje

Nnadi²,

Oti³

2022

IJECE

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<p>This paper presents a step-wise modelling of a symmetrical six-phase induction machine driven by a six-phase diode clamped multi-level inverter at a varying rotor resistance and motor inertia. The machine drive process was considered in two stages. The first stage presents the dynamic behavior of the machine when a load torque of 0 Nm and 100 Nm is applied at a varied rotor external resistance value of (0.8 and 3.2) Ω with constant motor inertia. The second stage showcased the variations in the speed, electromagnetic torque and rotor current when motor inertia is varied at (0.5 and 1.5) Kg-m2 with rotor resistance held constant. A six-phase five-level diode clamped converter phase displaced by sixty degrees with a modulation index of 0.8 was modeled to drive the poly-phase machine at a reduced %THD. All machine models were simulated in MATLAB 7.11. The simulation results showed that reduced oscillations in rotor current, motor speed and torque pulsations were achieved at a varied external rotor resistance and motor inertia.</p>

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Section: Method: Modelling Of the Six-phase Squirrel Cage Induction M...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-phase inverter-controlled induction machine at varied rotor parameters

Omeje

Nnadi²,

Oti³

2022

IJECE

View full text Add to dashboard Cite

show abstract

“…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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