Rotor Resistance

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B W Williams - One of the best experts on this subject based on the ideXlab platform.

  • A novel Rotor Resistance identification method for an indirect Rotor flux-orientated controlled induction machine system
    IEEE Transactions on Power Electronics, 2002
    Co-Authors: Xing Yu, M W Dunnigan, B W Williams
    Abstract:

    This paper proposes a novel Rotor Resistance identification method for an indirect Rotor flux-orientated controlled induction machine drive. The method is effectively integrated with the intermediate current control loop of the system. A decoupled synchronous voltage control scheme is used to achieve a fast, accurate current control response and indicates the relative thermal change of the Rotor Resistance. A model reference adaptive control scheme is then used to track the variation of the Rotor Resistance. Other issues, such as the nonideal characteristics of the power devices, stator Resistance variation and comparison with two other parameter identification methods, are included. This method is less complex and more effective than others, and this is supported by theoretical analysis, and verified by simulation and experimental results.

  • improving the accuracy of the Rotor Resistance estimate for vector controlled induction machines
    IEE Proceedings - Electric Power Applications, 1997
    Co-Authors: S Wade, M W Dunnigan, B W Williams
    Abstract:

    The estimation of Rotor Resistance in a vector-controlled induction machine is necessary to achieve high performance torque control. The extended Kalman filter (EKF) or the extended Luenberger observer (ELO) have been used to estimate this machine parameter. Three techniques are presented for use with the EKF and ELO which improve the accuracy of the Rotor Resistance estimate, either in both estimators, or in the EKF alone. These techniques are: the use of the synchronous two-axis (d/sub e/-q/sub e/) frame model of the induction machine with the EKF, the inclusion of the core loss Resistance to precalculate the phase currents used by the estimators, and the injection of a high frequency sine wave on the flux current reference command. These improvements are achieved without increasing the complexity of the estimation algorithms. The consequent improvements in the Rotor Resistance estimation are illustrated through simulation and practical implementation of a vector-controlled induction machine. A high performance digital signal processor (DSP) is used in the practical implementation.

  • a new method of Rotor Resistance estimation for vector controlled induction machines
    IEEE Transactions on Industrial Electronics, 1997
    Co-Authors: S Wade, W Dunnigan, B W Williams
    Abstract:

    The estimation of Rotor time constant, or Rotor Resistance, in a vector-controlled induction machine is necessary to achieve high-performance torque control. A new method of estimating the Rotor Resistance online, for use in a vector-controlled induction machine, is presented. It uses short duration pulses added to the constant flux reference current i/sub dse/* and based on the resultant torque command current produced by a proportional-integral controller i/sub qse/* adjusts the Rotor Resistance estimate. This method of self-tuning the vector controller to the Rotor time constant, when operating in a closed-loop speed control loop, does not produce torque pulsations when correctly tuned. In comparison to other online methods such as the extended Kalman filter and the extended Luenberger observer, this method does not require voltage sensors and is computationally simpler. The Rotor Resistance estimation technique is illustrated through simulation and practical implementation of a vector-controlled induction machine.

P Tomei - One of the best experts on this subject based on the ideXlab platform.

  • adaptive observer based control of induction motors with unknown Rotor Resistance
    International Journal of Adaptive Control and Signal Processing, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An output feedback control for induction motors which is based on Rotor speed and stator current measurements is presented. It is adaptive with respect to constant unknown torque load and Rotor Resistance. The main feature of this control is the incorporation of a novel adaptive flux observer which provides exponentially convergent estimates of Rotor fluxes and Rotor Resistance under persistency-of-excitation conditions that are satisfied in physical operating conditions. Extensive simulations show that asymptotic convergence is achieved for the overall closed loop system; in particular, the true values of torque load and Rotor Resistance are obtained and the speed and flux level references are independently tracked.

  • Adaptive observer‐based control of induction motors with unknown Rotor Resistance
    International Journal of Adaptive Control and Signal Processing, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An output feedback control for induction motors which is based on Rotor speed and stator current measurements is presented. It is adaptive with respect to constant unknown torque load and Rotor Resistance. The main feature of this control is the incorporation of a novel adaptive flux observer which provides exponentially convergent estimates of Rotor fluxes and Rotor Resistance under persistency-of-excitation conditions that are satisfied in physical operating conditions. Extensive simulations show that asymptotic convergence is achieved for the overall closed loop system; in particular, the true values of torque load and Rotor Resistance are obtained and the speed and flux level references are independently tracked.

  • Global adaptive output feedback control of induction motors with uncertain Rotor Resistance
    Proceedings of 35th IEEE Conference on Decision and Control, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    We design for the first time a global adaptive output feedback control for induction motors, which guarantees asymptotic tracking of smooth speed references only on the basis of speed and stator current measurements, for any initial condition and for any unknown constant value of torque load and Rotor Resistance. These two parameters are the only ones which largely vary during operations. The proposed 7th order nonlinear compensator generates estimates both for the unknown parameters (torque load and Rotor Resistance) and for the unmeasured states (Rotor flux); they converge to the corresponding true values under persistency of excitation which actually holds in physical operating conditions.

  • exponentially convergent Rotor Resistance estimation for induction motors
    IEEE Transactions on Industrial Electronics, 1995
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    A new estimation algorithm is presented which provides exponential estimation of Rotor Resistance for induction motor drives in physical operating conditions. The exponential convergence is not influenced by the value assumed by Rotor speed, including zero speed. The algorithm also provides flux estimates and may be viewed as an adaptive observer. Experimental results show good performance with a sampling time of 0.8 ms which makes the algorithm implementable on-line by available digital signal processors. >

  • Adaptive observer for induction motors with unknown Rotor Resistance
    Proceedings of 1994 33rd IEEE Conference on Decision and Control, 1994
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An observer for induction motors which is based on Rotor speed and stator currents measurements is presented: it is adaptive with respect to unknown Rotor Resistance. >

Kouki Matsuse - One of the best experts on this subject based on the ideXlab platform.

  • Rotor Resistance adaptation for sensorless vector-controlled induction machines
    Electrical Engineering in Japan, 1998
    Co-Authors: Hisao Kubota, Daisuke Yoshihara, Kouki Matsuse
    Abstract:

    The vector control method is widely used for induction motor drives. In these applications, a rotational transducer such as a shaft encoder is used. A rotational transducer, however, cannot be mounted in some cases, such as motor drives in a hostile environment or high-speed motor drives. Several sensorless vector-controlled induction machine drive methods have been proposed. These methods have the disadvantage that Rotor Resistance variation causes errors in the estimation of the motor speed. It is difficult to estimate the motor speed and the Rotor Resistance simultaneously, because the equivalent Rotor Resistance is the ratio of the Rotor Resistance to the slip at steady state. Therefore, we have proposed a method of simultaneously estimating the motor speed and the Rotor Resistance of an induction motor by superimposing ac components on the field current command. This paper presents a modified method of the Rotor Resistance adaptation. The validity of the proposed method is verified by experiments. © 1998 Scripta Technica, Electr Eng Jpn, 125(2): 65–72, 1998

  • Simultaneous estimation of speed and Rotor Resistance of field oriented induction motor without rotational transducers
    Conference Record of the Power Conversion Conference - Yokohama 1993, 1993
    Co-Authors: Hisao Kubota, Kouki Matsuse
    Abstract:

    Several field oriented induction motor drive methods without rotational transducers have been proposed. These methods have a disadvantage that the Rotor Resistance variation causes the estimation error of the motor speed. Therefore, simultaneous estimation of the motor speed and the Rotor Resistance is required. This paper presents a method of estimating simultaneously the motor speed and the Rotor Resistance of an induction motor by superimposing AC components on the field current command.

  • Speed sensorless field oriented control of induction motor with Rotor Resistance adaptation
    Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting, 1993
    Co-Authors: Hisao Kubota, Kouki Matsuse
    Abstract:

    The authors present a method for estimating simultaneously the motor speed and the Rotor Resistance of an induction motor by superimposing AC components on the field current command. In addition, a Rotor Resistance adaptive scheme is proposed in order to decouple the Rotor Resistance adaptation with the motor speed variation. The validity of the proposed method has been verified by simulation.

  • speed sensorless field oriented control of induction motor with Rotor Resistance adaptation
    IEEE Industry Applications Society Annual Meeting, 1993
    Co-Authors: Hisao Kubota, Kouki Matsuse
    Abstract:

    Several field-oriented induction motor drive methods without rotational transducers have been proposed. These methods have a disadvantage that the Rotor Resistance variation causes an estimation error of the motor speed. Therefore, simultaneous estimation of the motor speed and the Rotor Resistance is required. This paper presents a method of estimating simultaneously the motor speed and the Rotor Resistance of an induction motor by superimposing AC components on the field current command. The validity of the proposed method is verified by simulation and experimentation. >

S Wade - One of the best experts on this subject based on the ideXlab platform.

  • improving the accuracy of the Rotor Resistance estimate for vector controlled induction machines
    IEE Proceedings - Electric Power Applications, 1997
    Co-Authors: S Wade, M W Dunnigan, B W Williams
    Abstract:

    The estimation of Rotor Resistance in a vector-controlled induction machine is necessary to achieve high performance torque control. The extended Kalman filter (EKF) or the extended Luenberger observer (ELO) have been used to estimate this machine parameter. Three techniques are presented for use with the EKF and ELO which improve the accuracy of the Rotor Resistance estimate, either in both estimators, or in the EKF alone. These techniques are: the use of the synchronous two-axis (d/sub e/-q/sub e/) frame model of the induction machine with the EKF, the inclusion of the core loss Resistance to precalculate the phase currents used by the estimators, and the injection of a high frequency sine wave on the flux current reference command. These improvements are achieved without increasing the complexity of the estimation algorithms. The consequent improvements in the Rotor Resistance estimation are illustrated through simulation and practical implementation of a vector-controlled induction machine. A high performance digital signal processor (DSP) is used in the practical implementation.

  • a new method of Rotor Resistance estimation for vector controlled induction machines
    IEEE Transactions on Industrial Electronics, 1997
    Co-Authors: S Wade, W Dunnigan, B W Williams
    Abstract:

    The estimation of Rotor time constant, or Rotor Resistance, in a vector-controlled induction machine is necessary to achieve high-performance torque control. A new method of estimating the Rotor Resistance online, for use in a vector-controlled induction machine, is presented. It uses short duration pulses added to the constant flux reference current i/sub dse/* and based on the resultant torque command current produced by a proportional-integral controller i/sub qse/* adjusts the Rotor Resistance estimate. This method of self-tuning the vector controller to the Rotor time constant, when operating in a closed-loop speed control loop, does not produce torque pulsations when correctly tuned. In comparison to other online methods such as the extended Kalman filter and the extended Luenberger observer, this method does not require voltage sensors and is computationally simpler. The Rotor Resistance estimation technique is illustrated through simulation and practical implementation of a vector-controlled induction machine.

R Marino - One of the best experts on this subject based on the ideXlab platform.

  • adaptive observer based control of induction motors with unknown Rotor Resistance
    International Journal of Adaptive Control and Signal Processing, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An output feedback control for induction motors which is based on Rotor speed and stator current measurements is presented. It is adaptive with respect to constant unknown torque load and Rotor Resistance. The main feature of this control is the incorporation of a novel adaptive flux observer which provides exponentially convergent estimates of Rotor fluxes and Rotor Resistance under persistency-of-excitation conditions that are satisfied in physical operating conditions. Extensive simulations show that asymptotic convergence is achieved for the overall closed loop system; in particular, the true values of torque load and Rotor Resistance are obtained and the speed and flux level references are independently tracked.

  • Adaptive observer‐based control of induction motors with unknown Rotor Resistance
    International Journal of Adaptive Control and Signal Processing, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An output feedback control for induction motors which is based on Rotor speed and stator current measurements is presented. It is adaptive with respect to constant unknown torque load and Rotor Resistance. The main feature of this control is the incorporation of a novel adaptive flux observer which provides exponentially convergent estimates of Rotor fluxes and Rotor Resistance under persistency-of-excitation conditions that are satisfied in physical operating conditions. Extensive simulations show that asymptotic convergence is achieved for the overall closed loop system; in particular, the true values of torque load and Rotor Resistance are obtained and the speed and flux level references are independently tracked.

  • Global adaptive output feedback control of induction motors with uncertain Rotor Resistance
    Proceedings of 35th IEEE Conference on Decision and Control, 1996
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    We design for the first time a global adaptive output feedback control for induction motors, which guarantees asymptotic tracking of smooth speed references only on the basis of speed and stator current measurements, for any initial condition and for any unknown constant value of torque load and Rotor Resistance. These two parameters are the only ones which largely vary during operations. The proposed 7th order nonlinear compensator generates estimates both for the unknown parameters (torque load and Rotor Resistance) and for the unmeasured states (Rotor flux); they converge to the corresponding true values under persistency of excitation which actually holds in physical operating conditions.

  • exponentially convergent Rotor Resistance estimation for induction motors
    IEEE Transactions on Industrial Electronics, 1995
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    A new estimation algorithm is presented which provides exponential estimation of Rotor Resistance for induction motor drives in physical operating conditions. The exponential convergence is not influenced by the value assumed by Rotor speed, including zero speed. The algorithm also provides flux estimates and may be viewed as an adaptive observer. Experimental results show good performance with a sampling time of 0.8 ms which makes the algorithm implementable on-line by available digital signal processors. >

  • Adaptive observer for induction motors with unknown Rotor Resistance
    Proceedings of 1994 33rd IEEE Conference on Decision and Control, 1994
    Co-Authors: R Marino, S Peresada, P Tomei
    Abstract:

    An observer for induction motors which is based on Rotor speed and stator currents measurements is presented: it is adaptive with respect to unknown Rotor Resistance. >

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