By Fouad Giri
The complexity of AC motor keep watch over lies within the multivariable and nonlinear nature of AC laptop dynamics. fresh developments on top of things idea now give the chance to accommodate long-standing difficulties in AC vehicles regulate. this article expertly attracts on those advancements to use a variety of model-based keep watch over designmethods to quite a few AC automobiles. Contributions from over thirty most sensible researchers clarify how smooth keep watch over layout tools can be utilized to accomplish tight pace legislation, optimum lively potency, and operation reliability and security, by way of contemplating on-line nation variable estimation within the absence of mechanical sensors, strength issue correction, laptop flux optimization, fault detection and isolation, and fault tolerant keep watch over. Describing the total keep an eye on technique, either controller and observer designs are verified utilizing complex nonlinear equipment, balance and function are analysed utilizing strong strategies, together with implementation concerns utilizing electronic computing potential. different key gains: - Covers the most different types of AC cars together with triphase, multiphase, and doubly fed induction automobiles, wound rotor, everlasting magnet, and inside PM synchronous cars - Illustrates the usefulness of the complicated keep watch over tools through commercial purposes together with electrical cars, excessive pace trains, metal turbines, and extra - comprises specified specialize in sensorless nonlinear observers, adaptive and strong nonlinear controllers, output-feedback controllers, fault detection and isolation algorithms, and fault tolerant controllers
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Additional resources for AC Electric Motors Control Advanced Design Techniques and Applications
References Blaschke F (1972) The principle of ﬁeld orientation applied to the new trans-vector closed-loop control system for rotating ﬁeld machine. Siemens Review, 93, 217–220. De Leon J, Alvarez-Leal JG, Castro-Linares R, and Alvarez-Gallegos J (2001) Control of a ﬂexible joint robot manipulator via a nonlinear control-observer scheme. International Journal of Control, 74, 290–302. El Fadili A, Giri F, Magri A, et al. (2012a) Adaptive nonlinear control of induction motors through AC/DC/AC converters.
It illustrates how state observers can be useful in fault diagnostic for modern high-speed electric traction applications. State observers are used for online estimation of motor speed and load torque. The analysis of speed and load torque signals makes it possible to assess the state of speed sensor and torque transmission systems in electric traction vehicle. When some malfunctioning is detected, for example, in the case of speed sensor faults, the motor control system can be switched to speed sensorless mode.
The simpler (two-phase) models are still nonlinear but will prove to be tractable in control design. The modeling approach presented in this chapter is deliberately kept simple in the sense that the magnetic circuit has been supposed to be linear. As a matter of fact, in real-life machines, the magnetic circuit characteristic is nonlinear and linear approximations are only accurate if the machine operation does not entail wide-range rotor ﬂux variation. Typically, the rotor ﬂux must remain all the time close to its nominal value.