Browsing by Author "Inanc, N"

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A New Sliding Mode Flux and Current Observer for Direct Field Oriented Induction Motor Drives
(Elsevier Science Sa, 2002) Inanc, N
A direct field orientation (DFO) control for an induction machine is designed and implemented using a new sliding mode technique. The rotor flux is estimated using the current model flux observer. A close loop flux observer, based on the current estimate error, is then constructed. A unique feature of the proposed observer is that the flux and current observers include a sliding function, which is a derivative of the flux. Therefore, when the estimated current converges to the measured one, the sliding function itself is integrated to calculate the flux magnitude and angle. The observer stability is verified via Lyapunov stability analysis. Simulation and experimental results are presented to show the performance of sliding-mode based DFO control for an induction motor drive system. (C) 2002 Elsevier Science B.V. All rights reserved.
Torque Ripple Minimization of a Switched Reluctance Motor by Using Continuous Sliding Mode Control Technique
(Elsevier Science Sa, 2003) Inanc, N; Ozbulur, V
This paper proposes a new method to minimize torque ripple of a switched reluctance motor (SRM), which is based on the control of the sum of the square of the phase currents by using only two current sensor and analog multipliers. In addition, the sliding mode control (SMC) technique has been applied to SRM speed control loop that compensates the low frequency oscillations on the torque output. The applied sliding mode controller adjusts the value of the reference current to keep the speed of the motor constant. The proposed sliding mode continuous controller performs better than PI and Fuzzy controllers and is also more robust to the external disturbances. The results show that the continuous sliding mode controller is effective compared to PI or Fuzzy controllers in reducing the torque ripple of the motor, compensating for the nonlinear torque characteristics and making the drive insensitive to parameter variations as well. Since, mutual inductances have an important disturbance effect on the torque ripple, mathematical model of the SRM has been derived in presence of them. It has been used a completely analog system to implement the proposed algorithm. Also. a mechanical sensor has been used to sense the rotor position. Simulation and experimental results are given to validate the proposed method for the self and mutual inductances and current measurements. (C) 2003 Elsevier Science B.V. All rights reserved.
Phase Current Modulation of Switched Reluctance Motor To Minimize Torque Ripple
(Elsevier Science Sa, 2002) Inanc, N
This paper presents a simple technique to minimize torque ripple of a switched reluctance motor (SRM). The technique is based on the control of the sum of the square of the phase currents by using only two current sensors and analog multipliers. The control characteristics of the SRM drives are analyzed for operation of the motor in the linear region of its magnetic characteristics. The simulation and experimental results of the proposed method are given. The advantages and limitations of the proposed circuit are explained. (C) 2002 Elsevier Science B.V. All rights reserved.