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Author

John Chiasson

Bio: John Chiasson is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 221 citations.

Papers
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BookDOI
18 Mar 2005
TL;DR: In this article, the physics of AC machines are discussed and a model of symmetric balanced three-phase AC machines is proposed for feedback control and PM Synchronous Motor Control.
Abstract: PART I: DC MACHINES, CONTROLS AND MAGNETICS. 1. The Physics of the DC Motor. 2.Feedback Control. 3. Magnetic Fields and Materials. PART II: AC MACHINE THEORY. 4. Rotating Magnetic Fields. 5. The Physics of AC Machines. 6. Mathematical Models of AC Machines. 7. Symmetric Balanced Three-Phase AC Machines. 8. Induction Motor Control. 9. PM Synchronous Motor Control. 10. Trapezoidal Back-Emf PM Synchronous Motors (BLDC). Appendix: Trigonometric Table and Identities. References. Index.

237 citations


Cited by
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Journal ArticleDOI
TL;DR: The proposed high-gain GPI observer-based ADR controller is justified in terms of a singular perturbation approach and verified by means of realistic computer simulations, using the MATLAB/SIMULINK-PSIM package.
Abstract: This brief presents an active disturbance rejection control scheme for the angular velocity trajectory tracking task on a substantially perturbed, uncertain, and permanent magnet synchronous motor. The presence of unknown, time varying, and load-torque inputs, unknown system parameters, and the lack of knowledge of the initial shaft's angular position, prompts a high-gain generalized proportional integral (GPI) observer-based active disturbance rejection (ADR) controller. This controller is synthesized on the basis of the differential flatness of the system and the direct measurability of the system's flat outputs, constituted by the motor's angular displacement and the d-axis current. As a departure from many previous treatments, the d-q-axis currents model is here computed on the basis of the measured displacement and not on the basis of the unknown position. The proposed high-gain GPI observer-based ADR controller is justified in terms of a singular perturbation approach. The validity and robustness of the scheme are verified by means of realistic computer simulations, using the MATLAB/SIMULINK-PSIM package.

279 citations

Journal ArticleDOI
TL;DR: In this article, Mihajlovic et al. investigated the effect of hidden oscillations in a two-mass mathematical model of a drilling system and showed that these effects may lead to drill string failures and breakdowns.
Abstract: This work is devoted to the investigation of mathematical models of drilling systems described by ordinary differential equations. Here, we continue the study done by the researchers from Eindhoven where the two-mass mathematical model of a drilling system has been investigated (Mihajlovic et al. J. Dyn. Syst. Meas. Control 126(4): 709–720, 2004; de Bruin et al. Automatica 45(2): 405–415, 2009). The modified version of this model, which takes into account a full description of an induction motor, is studied. It is shown that such complex effects as hidden oscillations may appear in these kinds of systems. These effects may lead to drill string failures and breakdowns.

233 citations

Journal ArticleDOI
TL;DR: Solutions to both problems, which are particularly tailored for the widely popular permanent magnet synchronous motors, are provided and Simulation and experimental results of the position observer, used together with a classical field-oriented control algorithm, are presented.
Abstract: The control algorithms used in high performance ac drives require the knowledge of rotor position and, in the case of speed regulation, also of speed. Since in many applications rotational transducers cannot be installed, their reconstruction is needed. The use of observers is stymied by the fact that the dynamics of electrical machines are highly nonlinear and does not belong to the class studied by the nonlinear control community. In this paper solutions to both problems, which are particularly tailored for the widely popular permanent magnet synchronous motors, are provided. A key step for the design of both observers is the choice of a suitable set of coordinates. The position observer is a standard gradient search whose detailed analysis reveals outstanding (global asymptotic) stability properties. Furthermore, the analysis clearly exhibits the interplay between rotor speed and the gain of the gradient search-that (essentially) determines its convergence rate. The position observer is a simple two-dimensional nonlinear system, hence is easily implementable. The speed observer is designed following the immersion and invariance technique and is also shown to be globally convergent. Simulation and experimental results of the position observer, used together with a classical field-oriented control algorithm, are presented.

174 citations

Journal ArticleDOI
TL;DR: A new sliding- mode observer that uses only the measured stator currents is synthesized to estimate the speed, flux, and load torque and a current-based field-oriented sliding-mode control is developed so as to steer the estimated speed and flux magnitude to the desired references.
Abstract: In this paper, a sensorless output feedback controller is designed in order to drive the induction motor (IM) without the use of flux and speed sensors. First, a new sliding-mode observer that uses only the measured stator currents is synthesized to estimate the speed, flux, and load torque. Second, a current-based field-oriented sliding-mode control is developed so as to steer the estimated speed and flux magnitude to the desired references. A stability analysis based on the Lyapunov theory is also presented in order to guarantee the closed-loop stability of the proposed observer-control system. Two experimental results for a 1.5-kW IM are presented and analyzed by taking into account the unobservability phenomena of the sensorless IM.

127 citations

Journal ArticleDOI
TL;DR: A novel sixth order nonlinear adaptive control algorithm is designed, which does not rely on nonrobust open loop integration of motor dynamics and guarantees, under persistency of excitation, local exponential rotor speed tracking.
Abstract: The tracking control problem is addressed for sensorless (nonsalient-pole surface) permanent magnet synchronous motors with unknown constant load torque. Assuming that only stator currents and voltages are available for feedback, a novel sixth order nonlinear adaptive control algorithm is designed, which does not rely on nonrobust open loop integration of motor dynamics and guarantees, under persistency of excitation, local exponential rotor speed tracking.

103 citations