A new method to simulate induction machines with rotor asymmetries

Cunha, Carla César Martins; Soares, F.B.R.; Oliveira, Pedro; Filho, Braz J. Cardoso

doi:10.1109/iecon.2002.1187484

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…Broken rotor modelling methods has been reported in Rodriguez-Cortes et al (2004), Manolas and Tegopoulos (1999), Munoz-Garcia and Lipo (1999), Didier et al (2005) and Cunha and Oliveira (2002). Authors have considered feasibility of using T transformation proposed in Cunha and Oliveira (2002), where rotor current was modified to calculate torque pulsation in open-loop model and diagnose rotor fault. This transformation enables the introduction of the machine asymmetry in the machine model based on space vector theory and transforms rotor bar currents from natural to dq0 coordinates.…”

Section: Rotor Fault Modellingmentioning

confidence: 99%

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Broken rotor bar impact on sensorless control of induction machine

Kołodziejek

Bogalecka

2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is analysis of the sensorless control system of induction machine with broken rotor for diagnostic purposes. Increasing popularity of sensorless controlled variable speed drives requires research in area of reliability, range of stable operation, fault symptoms and application of diagnosis methods. Design/methodology/approach -T transformation used for conversion of instantaneous rotor currents electrical circuit representation to space vector components is investigated to apply with closed-loop modeling algorithm. Evaluation of the algorithm is based on analysis of asymmetry influence to the orthogonal and zero components of space vector representation. Multiscalar model of the machine and selected structures of state observers are used for sensorless control system synthesis. Proposed method of frequency characteristics calculation is used for state observers analysis in open-loop operation. Findings -New algorithm of applying the T transformation allows for closed-loop and sensorless control system simulation with asymmetric machine due to broken rotor. Compensating effect of the closed-loop control system with speed measurements and diagnosis information in control system variables are identified. Proposed frequency analysis of state observers is presented and applied. Variables with amplified characteristic frequency components related to rotor asymmetry are compared for selected structures of state observers and with closed-loop and open-loop operation. Method of improving the sensorless system stability is proposed. Practical implications -In closed-loop and sensorless control system rotor fault can be diagnosed by using PI output controllers variables. Compensating effect of mechanical variables sets limitation to specified diagnosis methods. Rotor asymmetry affects sensorless control system stability depending on estimator structure. Originality/value -This paper concentrates upon sensorless control system operation with machine asymmetry and indicates rotor fault symptoms.

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Section: Rotor Fault Modellingmentioning

confidence: 99%

“…Assuming instantaneous rotor currents as in Figure 2 and insulated rotor bars electric circuit theory is used for simplified description of fault machine as in Cunha and Oliveira (2002):…”

Section: Rotor Fault Modellingmentioning

confidence: 99%

Broken rotor bar impact on sensorless control of induction machine

Kołodziejek

Bogalecka

2009

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…Broken rotor modelling methods has been reported in [6] and [14][15][16][17][18]. Authors have considered feasibility of using T transformation proposed in [18], where rotor current was modified to calculate torque pulsation in open-loop model and diagnose rotor fault.…”

Section: Rotor Fault Modellingmentioning

confidence: 99%

“…Authors have considered feasibility of using T transformation proposed in [18], where rotor current was modified to calculate torque pulsation in open-loop model and diagnose rotor fault. Analysis of instantaneous rotor currents impact on d-q-0 components shows that T transformation can be also used in closedloop modelling algorithm of the machine with assumption of specific reference frame and state variables choice to calculate model differential equations.…”

Section: Rotor Fault Modellingmentioning

confidence: 99%

Broken rotor bar impact on the closed loop and sensorless control of induction machine

Kołodziejek

Bogalecka²

2008

2008 13th International Power Electronics and Motion Control Conference

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This paper presents analysis of closed loop and sensorless control of induction machine with broken rotor bar for on-line diagnostics purposes. Closed loop control system synthesis of induction motor is based on symmetrical model of the machine. In case of induction machine operation with broken rotor bars, rotor speed pulsation is compensated by the control system. Simulation of Multiscalar Control with the fault machine shows that decoupling variables can be used as detection signals. Analysis of speed observer frequency response in open loop operation gives information about disturbance impact on estimation error. Further analysis indicates that machine asymmetry can affect stability of sensorless control system with speed observer.

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“…This method has advantages such as convenience in sampling, etc. but because of the peculiarity of this signal (magnitude is small, frequency near the fundamental frequency), this brings difficulty for signal analysis and fault diagnosis, especially for highcapacity induction machine, due to very small the slip rate, which seriously affects the accuracy of the diagnosis [4]- [6] . According to the above analysis, the fluctuation of the torque and speed is complementary with the current characteristic.…”

Section: Application Example: Diagnosing Rotor Winding Faultsmentioning

confidence: 99%

Calculation of the main parameters of induction machines under rotor winding faults

Zhang

Han

et al. 2005

2005 International Power Engineering Conference

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Based on the multi-loop method, this paper analyzes and calculates the stator current, rotating torque and rotating speed of the induction machine, and the main work focuses on the fluctuating components of the torque and the speed caused by rotor winding faults. The conclusions of the analysis are as the follows: the rotor winding faults will cause stator current, electromagnetic torque and rotating speed to fluctuate; their fluctuating frequencies are the same and their magnitude will increase with the rise of the severity of the faults; the load inertia has a big impact on the torque and speed fluctuation; with the increase of the inertia, the fluctuation of the torque will rise, while the corresponding speed fluctuation will decline obviously. Besides, this paper applies the fluctuating components of the torque and speed to the fault diagnosis of the machine's rotor winding.

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A new method to simulate induction machines with rotor asymmetries

Cited by 7 publications

References 3 publications

Broken rotor bar impact on sensorless control of induction machine

Broken rotor bar impact on sensorless control of induction machine

Broken rotor bar impact on the closed loop and sensorless control of induction machine

Calculation of the main parameters of induction machines under rotor winding faults

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