Unbalanced thrust control of multiple induction motors for traction system

Xu, Fei; Shi, Liming

doi:10.1109/iciea.2011.5976064

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…Therefore, this configuration assumes that both motors are equal and does not allow torque-sharing calculation. Having information on the torque-sharing can improve drive stability and performance [1][2][3][4]. Reference [1] and [3] utilize a weighing factor to relieve torque difference.…”

Section: B Typical Current Sensor Configurationsmentioning

confidence: 99%

“…If both induction motors and their speeds were identical, the parallel condition would result in identical torque levels in each machine. However, this does not occur in railway applications due to some factors, such as unequal wheel diameter, driving in a curve, or sudden wheel slipping [1]. In addition, motor parameters may differ to some extent.…”

Section: Introductionmentioning

confidence: 99%

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Sensorless Saliency-Based Control of Dual Induction Machines Under Dynamic Load Imbalances Using Three Current Sensors

Montero

Vogelsberger²,

Wolbank

2023

IEEE Trans. Ind. Electron.

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To perform vector control of single-inverter dual induction motors, drives are standardly equipped with current and position sensors. In medium-power railway applications, a shaft encoder is usually mounted on each motor, and the inverter output current is measured using two current sensors. Yet, this configuration features some disadvantages. First, torque-sharing cannot be computed because stator current of each motor is unknown. Similarly, saliency extraction of each motor is not achievable since individual current drawn by each motor is not measured. An option that achieves torque-sharing calculation is to attach two current sensors to each motor, provided that both rotor positions are known. However, industrial inverter/control platforms considered offer a maximum of three input channels for current sensors. Besides, some industry fields tend towards encoderless speed control. Therefore, this paper proposes to use three current sensors in total and no shaft encoders. Thanks to a special current sensor arrangement and a voltage step excitation method, saliency-based encoderless control is achieved. In addition, a method is presented to estimate torque-sharing. Experimental measurements, taken on a dual induction motor test bench, will show the capability of the proposed methodology to identify individual loading as well as excellent encoderless control performance.

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Section: B Typical Current Sensor Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensorless Saliency-Based Control of Dual Induction Machines Under Dynamic Load Imbalances Using Three Current Sensors

Montero

Vogelsberger²,

Wolbank

2023

IEEE Trans. Ind. Electron.

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show abstract

“…To minimize the speed difference between the induction motors for unbalanced load conditions, two degrees of freedom control is applied and only simulation results were provided. A novel control strategy based on weighted voltage vector was proposed [7] to relieve the thrust difference in each wheel with a parallel connected induction motor drive. Simulation results were presented for wheel radial difference, curve radius, and parameter difference.…”

Section: Introductionmentioning

confidence: 99%

“…Average and differential currents flowing through the stator and rotor fluxes will be used to calculate the reference currents. In the research papers dealing with parallel connected induction motor drives [1][2][3][4], the hardware results were presented for step change in speed under no load conditions, and in [5][6][7][8][10][11][12][13][14] only simulations results were presented. In this paper, experimental results are presented for balanced and unbalanced load conditions to prove the effectiveness of the proposed method.…”

Section: Introductionmentioning

confidence: 99%

Vector control of a three-phase parallel connected two motor single inverter speed sensorless drive

Ramachandran¹,

Subbiah²,

Padmanaban³

2016

Turk J Elec Eng & Comp Sci

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This paper presents the performance characteristics of two induction motors of the same parameters and ratings connected in parallel and fed by a single inverter. A nature observer is employed to estimate the rotor speeds and rotor fluxes of both induction motors. It also estimates the load torques of both the motors by load torque adaptation. Under unbalanced load conditions, the speed difference between the two induction motors is reduced by considering the average and differential motor parameters and currents. Mean rotor flux is maintained constant by a rotor flux control scheme and the estimation of rotor angle is carried out by direct vector control technique. The prototype experimental setup is made for validating the proposed method and the experimental results are demonstrated for various running conditions. The natural observer algorithm for speed and torque estimation is executed by TMS320F2812 DSP controller.

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“…In addition, to control the speed of parallel connected induction motor drive and to make the drive stable for unbalanced load conditions, nonlinear programming method [11]-[12], rotor flux oriented control scheme with parameter averaging and space vector averaging [13], motors with different ratings [14]- [15], adjustable PI controllers [16], rotor flux feedback control [17], matrix converter with slip frequency vector control [18], one degree of freedom control (1DOF) and two degree of freedom control (2DOF) [19], weighted voltage vector [20], new hybrid control method (speed and torque controller) [21], speedirrelevant motors using weighted flux linkage vector control [22], smart switching technique [23], mean and master slave field oriented control [24] and PI speed and current controllers [25] were employed.…”

Section: Introductionmentioning

confidence: 99%

Single Inverter Fed Speed Sensorless Vector Control of Parallel Connected Two Motor Drive

Gunabalan¹,

Subbiah²

2016

Automatika Journal

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Unbalanced thrust control of multiple induction motors for traction system

Cited by 11 publications

References 10 publications

Sensorless Saliency-Based Control of Dual Induction Machines Under Dynamic Load Imbalances Using Three Current Sensors

Sensorless Saliency-Based Control of Dual Induction Machines Under Dynamic Load Imbalances Using Three Current Sensors

Vector control of a three-phase parallel connected two motor single inverter speed sensorless drive

Single Inverter Fed Speed Sensorless Vector Control of Parallel Connected Two Motor Drive

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