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 conception now give the chance to house long-standing difficulties in AC automobiles keep an eye on. this article expertly attracts on those advancements to use quite a lot of model-based regulate designmethods to quite a few AC cars. Contributions from over thirty most sensible researchers clarify how sleek keep an eye on layout tools can be utilized to accomplish tight pace rules, optimum vigorous potency, and operation reliability and protection, by way of contemplating on-line country 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 full keep an eye on procedure, either controller and observer designs are established utilizing complex nonlinear equipment, balance and function are analysed utilizing strong suggestions, together with implementation concerns utilizing electronic computing capacity. different key positive factors: - Covers the most different types of AC automobiles together with triphase, multiphase, and doubly fed induction cars, wound rotor, everlasting magnet, and inside PM synchronous automobiles - Illustrates the usefulness of the complicated regulate equipment through business functions together with electrical automobiles, excessive pace trains, metal generators, and extra - comprises detailed specialise in sensorless nonlinear observers, adaptive and powerful 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
81), gives ωm2 − ωm1 = ωmo + Td F −t1 e τm −t1 e τm − 1 . 80) ωm1 − ωmo = ωmo + Td F −t1 e τm − 1 . 83), one obtains an equation where the only unknown is τm . 84) . , the motor stops turning) at t = ts , which is a known time. Doing so, one gets an equation where the only unknown quantity is TFd . Solving that equation with respect to the unknown, one gets ωmo Td = ts . 6. 2 concerning the quantities ωmo , ωm1 , ωm2 , t1 , and ts . 86) where τm = FJ . The point is that the two above equations involve three unknowns, namely F, J, and Td .
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.
2b) xc = A cos(ωt + ϕ + 2π/3). 3c) The variables may be currents, voltages, or magnetic ﬂuxes. An inherent property to (balanced) three-phase systems is that their homopolar components, that is, x0 = xa + xb + xc , are null all the time. In the latter, this property will be systematically used because all involved three-phase systems will be balanced. 1) is associated to a (ﬁctive) three-coordinate frame, say abc. This frame is sometimes also said to be stationary or stator-related. Then, the Concordia transformation is resorted to project the abc-frame onto the ﬁxed two-coordinate αβ-frame (Blaschke 1972).
AC Electric Motors Control Advanced Design Techniques and Applications by Fouad Giri