Direct torque control of three-phase PM brushless AC motor with one phase open-circuit fault

Utaikaifa, Kasem; Hoang, Khoa Dang; Liu, Y.; Howe, D.

doi:10.1109/iemdc.2009.5075353

Cited by 22 publications

(23 citation statements)

References 16 publications

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“…Hence, the current waveforms become very non-sinusoidal and unbalanced in magnitude even when the machine was driven under the maximum achievable speed and rated torque conditions [ Fig. 15 (c) and Table IX] (similar phenomena can be found in [20] and [31]). Additionally, it can be seen in Fig.…”

Section: Resultsmentioning

confidence: 75%

“…In addition, for the voltage model-based stator flux estimation scheme, the terminal phase voltages are computed from both the measured DC link voltage and the switching states of the inverter and a low-pass filter with a cut-off frequency of 5(rad/s) is utilized instead of a pure integrator to avoid integration drift problems [27]. For simplicity, Table VII] and their effects on machine operation were discussed in detail in [31]. Parameters of the tested machine are presented in Table VIII and more details can be found in [31] and [32].…”

Section: Resultsmentioning

confidence: 99%

“…For simplicity, Table VII] and their effects on machine operation were discussed in detail in [31]. Parameters of the tested machine are presented in Table VIII and more details can be found in [31] and [32]. A brushed DC generator is used to apply different load torque conditions.…”

Section: Resultsmentioning

confidence: 99%

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Influence and Compensation of Inverter Voltage Drop in Direct Torque-Controlled Four-Switch Three-Phase PM Brushless AC Drives

Hoang

Zhu

Foster

2011

IEEE Trans. Power Electron.

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Manuscript received 29 April, 2010; revised 6 July, 2010 and 24 September, 2010.The authors are with the Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield S1 3JD U. K. (email: k.hoang@sheffield.ac.uk; k.d.hoang@ieee.org; z.q.zhu@sheffield.ac.uk; z.q.zhu@ieee.org; m.p.foster@sheffield.ac.uk).Digital Object Identifier I. INTRODUCTIONIRECT torque and indirect torque control techniques are two common methodologies for controlling permanent magnet brushless AC machine [1], [2]. Normally, a sixswitch three-phase (SSTP) inverter [Fig. 1(a)] is used for high performance operation of a three-phase machine and is almost universally considered the industry standard. For economic reasons, however, reducing the cost of the inverter is still under investigation and one obvious way to achieve this aim is to decrease the number of inverter switching devices.Low cost inverter topologies with reduced number of switching devices for an induction machine drive system has been suggested and demonstrated in [3] and [4]. Welchko et al. [3] proposed using a three-switch three-phase inverter with an extra connection from neutral point to DC link mid-point to control torque and speed of an induction machine. Although this reduces the number of active switching devices, it requires modifications of both DC link and a specialized machine stator winding structure. A further disadvantage of this topology is that three phase currents are unidirectional and, hence, this topology is limited to particular applications. In [4] a fourswitch three-phase (FSTP) inverter [Fig. 1(b)] was presented where one of three phase machine terminals was connected to the DC link mid-point and control achieved by manipulating the voltages and currents of the two active phases. The performance of this inverter was comparable to the traditional SSTP inverter. However, machines controlled by a FSTP inverter could only achieve half rated speed due to the fact that the voltage vector value is decreased by a factor of two in comparison with that in a conventional SSTP inverter drive system [5]. It should be noted that for an induction machine 2 drive system, reconfiguration of the windings from star to delta connection can allow full-speed operation [4]. Reduction in high order harmonic currents flowing in the mid-point connected phase current can be seen as a further benefit of the FSTP inverter topology. Other investigations on the FSTP inverter topology include the minimisation of torque ripple by applying space vector modulation schemes [6], the application of pulse width modulation (PWM) control methodologies to improve scalar PWM performance and DC link imbalance [7], and the elimination of current distortion at low-speed operation caused by the limited values of DC link capacitors using a compensation strategy [8]; it was also demonstrated that current waveforms under high-speed and inertial load conditions remain naturally balanced and sinusoidal without compensation [8].Reliability improvement and fault tolerance...

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influence and Compensation of Inverter Voltage Drop in Direct Torque-Controlled Four-Switch Three-Phase PM Brushless AC Drives

Hoang

Zhu

Foster

2011

IEEE Trans. Power Electron.

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“…A novel voltage vector selection table must be defined for this purpose on the basis of the output states of the instantaneous stator flux magnitude hysteresis controller and EM torque hysteresis controller, as well as the equivalent sector where the instantaneous stator flux space vector is located [18], [19]. The output of the hysteresis controller for torque and flux are shown in Eqs.…”

Section: Torque Ripple Suppression For Fstpi Bldcm Drivementioning

confidence: 99%

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

Pan¹,

Sun²,

Wang³

et al. 2015

Journal of Power Electronics

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A novel inverter fault-tolerant control scheme is proposed to drive brushless DC motor. A fault-tolerant inverter and its three fault-tolerant schemes (i.e., phase A fault-tolerant, phase B fault-tolerant, and phase C fault-tolerant) are analyzed. Eight voltage vectors are summarized and a voltage vector selection table is used in the control scheme to improve the midpoint current of the split capacitors. A stator flux observer is proposed. The observer can improve flux estimation, which does not require any speed adaptation mechanism and is immune to speed estimation error. Global stability of the flux observer is guaranteed by the Lyapunov stability analysis. A novel stator resistance estimator is incorporated into the sensorless drive to compensate for the effects of stator resistance variation. DC offset effects are mitigated by introducing an integral component in the observer gains. Finally, a control system based on the control scheme is established. Simulation and experiment results show that the method is correct and feasible.

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“…For this purpose, an optimized switching table must be defined based on the output states of the instantaneous stator flux magnitude hysteresis controller and the electromagnetic torque hysteresis controller, together with the equivalent sector, in which instantaneous stator flux space vector is located [14,15]. The outputs of hysteresis controller for torque and flux are shown in (3) and (4).…”

Section: Optimal Switching Tablementioning

confidence: 99%

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

Pan¹,

Wang²,

Su³

et al. 2015

Journal of Electrical Engineering and Technology

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-The main purpose of this paper is to describe a DTC (direct torque control) method for four-switch brushless dc motor (BLDCM) drive. In the method, a novel voltage space vector modulation scheme, an optimal switching table, and a flux observation method are proposed. Eight voltage vectors are summarized, which are selected to control BLDCM in SVPWM pattern, and an optimal switching table is proposed to improve the torque distortion caused by midpoint current of the split capacitors. Unlike conventional flux observers, this observer does not require speed adaptation and is not susceptible to speed estimation errors, especially, at low speed. Global asymptotic stability of the flux observer is guaranteed by the Lyapunov stability analysis. DC-offset effects are mitigated by introducing a PI component in the observer gains. This method alleviates the undesired current and torque distortion which is caused by uncontrollable phase. The correctness and feasibility of the method are proved by simulation and experimental results.

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Direct torque control of three-phase PM brushless AC motor with one phase open-circuit fault

Cited by 22 publications

References 16 publications

Influence and Compensation of Inverter Voltage Drop in Direct Torque-Controlled Four-Switch Three-Phase PM Brushless AC Drives

Influence and Compensation of Inverter Voltage Drop in Direct Torque-Controlled Four-Switch Three-Phase PM Brushless AC Drives

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

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