speed control of single phase induction motor ppt

... a control strategy that varies the frequency and voltage of the signal applied to the windings of the induction motor, while controlling the flux created in the air-gap of the induction motor. ... designed to control a brush-less DC motor. However, by constructing a feedback loop that can detect the outputs of an induction motor, we can use this motor controller to control an induction ... the induction motor s many advantages are clearly explained. Wildi also presents the two types of induction motors: “the squirrel cage induction motor and the “wound motor . An explanation of...

Ngày tải lên: 27/10/2013, 23:15

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Ngày tải lên: 17/12/2013, 14:15

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Ngày tải lên: 18/12/2013, 09:10

... Conservation of Energy and the First Law of Thermodynamics 182 9.3 Nonconservation of Entropy and the Second Law of Thermodynamics 187 9.4 Nonconservation of Ectropy 189 9.5 Semistability of Discrete-Time ... notion of vec- tor dissipativity developed in Chapter 3 and optimality of the proposed decentralized feedback control law. The proposed control framework is then used to construct decentralized controllers ... Chapter 5, we introduce the notion of a control vector Lyapunov function as a generalization of control Lyapunov functions [6], and show that asymptotic stabilizability of a nonlinear dynamical system...

Ngày tải lên: 12/02/2014, 16:20

... single- phase induction motor. Figure 9.8-4. Average steady-state torque versus speed characteristics of a capacitor-start single- phase induction motor. UNBALANCED STATOR CONDITIONS OF INDUCTION ... speed exceeds a predetermined value of generally between 3% and 5% of synchronous speed of the rotor. SINGLE- PHASE INDUCTION MACHINES 367 Figure 9.8-5. Free-acceleration characteristics of ... windings of a two- phase induction machine to be out of phase. To accomplish this the impedances of the stator windings are made unequal. For example, the split -phase machine is a two -phase induction...

Ngày tải lên: 16/02/2014, 18:48

... development of entirely incremental grammar induction algorithms instead of the approaches of the systems discussed before. 1 Introduction Grammar induction is a task within the field of nat- ural ... suitable for the problem of gram- mar induction. Also, incremental systems have the advantage of an intuitive notion of time: it is al- ways clear which working hypothesis of a grammar is maintained. Emile ... connected, a number of hypotheses are generated, for example: ‘a book’ is a complement of ‘Tim’; ‘a book’ is a complement of ‘John gave Tim’; ‘a book’ is a second complement of ‘gave’. Naturally,...

Ngày tải lên: 20/02/2014, 12:20

... estimates of the burden of acute hepatitis B and hepatitis C in United States 2. Identify chronic cases of hepatitis B and C and measure prevalence x Develop accurate estimates of the burden of chronic ... Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council: ã Download hundreds of free books in PDF ã Read thousands of books ... Prevention and Control of Hepatitis B and C Heather M. Colvin and Abigail E. Mitchell, Editors; Committee on the Prevention and Control of Viral Hepatitis Infections; Institute of Medicine ...

Ngày tải lên: 06/03/2014, 01:20

... inter- actions of SR proteins [1–5]. Reversible phosphoryla- tion of SR proteins is important for assembly and function of the spliceosome and for proper regulation of alternative splicing, and also controls ... role in the life cycle control of viruses, which involves a series of alternative splicing events for expression of viral gen- ome or proteins. However, if the expression of these host factors ... the upstream region of this binding site to preclude splic- ing activators and hence inhibit splicing. Overexpres- sion of ASF ⁄ SF2 can antagonize the negative effect of hnRNP A1 on splicing of the HIV-1...

Ngày tải lên: 23/03/2014, 06:20

... the crossing of a pair of simple eigenvalues of the linearization of rotating waves through the imaginary axis. Similarly, Mantel and Barkley [42] described periodic forcing of meandering ... production and dispersal of spores. During the early phase of aggregation, chemotactic movement can proceed in form of spiral waves [17]. Spiral waves also arise in the oxidation of carbon-monoxide ... associated to t p is of the same order as the mean ISI, so that R p ~ 1. Thus R p is a measure of the coherence of the system response and the minimum of R p (a 2 ) characterizes ...

Ngày tải lên: 28/03/2014, 22:20

... 0.00785 0.7452 0.01235 Real Pressure at 112971m of the end of pipeline is 6970 kPa Table 3.5. Summary of numerical results of oulet pressure p 2 Results of outlet pressure and its differences with ... Real Pressure at 112971m of the end of pipeline is 7730 kPa The results with input data - sample 2 in table 3.1 along the associated gas pipeline of flow equations of Weymouth, Panhandle A, ... Real Pressure at 112971m of the end of pipeline is 7040 kPa The results with input data - sample 3 in table 3.1 along the associated gas pipeline of flow equations of Weymouth, Panhandle A,...

Ngày tải lên: 22/07/2014, 10:21

... elements of modeling and identification. All modern control theories rely on the availability of mathematical models of processes to control them. Modeling is therefore upstream of the control ... Management of saturations 349 11.5. Methodology 354 11.5.1. Intuitive approach 354 11.5.2. Reduction of the noise on the control by choice of degrees 356 11.5.3. Choice of the dynamics of A m ... obtain efficient control laws. Limits to the automated systems performances generally come from the restricted power of motors, precision of captors and variability of the behavior of the processes,...

Ngày tải lên: 09/08/2014, 06:23

... values of ξ . 10 0 -10 -20 -30 0 -45 -90 -135 -180 1 T 1 1 T 2 Module (dB )Phase (degree) Figure 1.23. Bode diagram of a second order system with ξ ≥ 1 20 Analysis and Control of Linear ... gain, () fΦ is the phase or phase difference of the frequency response. Through the Laplace transform, we obtain the transfer function of the system () pH , which is often referred to as ... intersection of the convergence domains of () X p and ()Yp The Laplace transform also makes it possible to determine the behavior at the time limits of a causal signal with the help of the following...

Ngày tải lên: 09/08/2014, 06:23

... The controllability indices and the invariant factors of the non-controllable part (if it exists) of the pair (A, B) (see section 4.2.3) form a set of full invariants under the action of the ... the analysis phases. The following example illustrates the importance of the location of zeros with respect to the solution of a traditional control problem which is the pursuit of model, by ... matrix of V and t W a basis of the canceller at the left of W (i.e. a maximal solution of equation W t W = {0}), a basis of LV is obtained by directly preserving only the independent columns of...

Ngày tải lên: 09/08/2014, 06:23

Ngày tải lên: 09/08/2014, 06:23

Ngày tải lên: 09/08/2014, 06:23