speed control of induction motor using triac ppt

Ngày tải lên: 18/12/2013, 22:06

Ngày tải lên: 15/10/2013, 16:10

Ngày tải lên: 17/12/2013, 14:15

... speed operation is the required rms value of the fundamental harmonic of the output phase to neutral voltage of the AC-AC voltage controller. Induction machine Fig. 6.5: Speed control of an induction ... with this type of load in practice. Speed control by stator voltage variation is realised by using AC-AC voltage controller in each stator phase of the machine. Voltage controller is of the same ... well. Thus the speed of an induction machine may be controlled by controlling the stator AC supply for both types of induction machines; additionally, speed may be controlled in slip-ring machines...

Ngày tải lên: 11/07/2014, 05:20

... 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 ... equiva- lent to the existence of a control vector Lyapunov function. Moreover, using control vector Lyapunov functions, we construct a universal decentralized feedback control law for a decentralized ... 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...

Ngày tải lên: 12/02/2014, 16:20

... 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 ... GL(X") of the group SE(2) on the func- tion space of spatial profiles u(t, .) E X" is defined by (P(R,S)4(4 := u(R-l(n: - s>>. (3.3) Thus, an element g = (R,S) of SE(2) ... 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

... 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 ... representation of determinist systems: the concept of state 44 2.1.2. Equations of state and equations of measurement for continuous systems 46 2.1.3. Case of linear systems 47 2.1.4. Case of continuous...

Ngày tải lên: 09/08/2014, 06:23

... 20 Analysis and Control of Linear Systems Table 1.1 sums up the features of a system’s transfer function, the existence conditions of its frequency response and the possibility of performing ... 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 ... by equations of state. Asymptotic stability Stability in the broad sense Unstable Figure 1.7. Concepts of stability Another point of view can be adopted where the stability of a system can...

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 ... 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 ... 110 Analysis and Control of Linear Systems The object of this chapter is to describe certain structural properties of linear systems that condition the resolution of numerous control problems....

Ngày tải lên: 09/08/2014, 06:23

... of ν 0 . 142 Analysis and Control of Linear Systems A discrete-time deterministic signal y[k],k ∈Zis, by definition, a sequence of complex numbers: y =  y[k]  k∈Z In short, we often speak of ... y 2 )  =  y 1  y 2 [5.9] 152 Analysis and Control of Linear Systems Figure 5.1. Typical power spectrum of an MA (left) or AR (right) model In the case of a single denominator (n c =0), we talk of an AR (autoregressive) model, ... the estimation of the frequency of noisy sine curves, deals with determining the argument of the poles of an AR model identified by maximum likelihood. In the general case, we speak of an ARMA (autoregressive...

Ngày tải lên: 09/08/2014, 06:23

... and not “s”. 366 Analysis and Control of Linear Systems Figure 11.17. Evolution of o A sA ( ⎯ο⎯ ) .of mo ' AA sAS and of m A B ( ⎯⎯ ) in the case of 4 o o 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ += T sA ... Analysis and Control of Linear Systems The number of equations is the number of rows in the Sylvester system and thus: number of equations = 1 om +∂+∂ AA [11.36b] Considering the uniqueness of the ... [11.60] where A, B and C are matrices of adequate size and x the state vector. The control of this process can thus be done by the technique of pole placement using an observer [KWA 72] according...

Ngày tải lên: 09/08/2014, 06:23

... machine-tools (cutting the pieces), of the control of robots arms, of monitoring the temperature profile of the applications in home automation, etc. 12.1.2. Explicit prediction of future behavior The ... study of stability of the corrected loop and thus the characterization of stability of the elaborated predictive control, which is from that moment on possible for a set of parameters of the ... regulator of this restated problem in terms of error signals: )()()()( 11 tqRtqS yoptu εε −− −= [12.24] 392 Analysis and Control of Linear Systems Hence, the calculation of the future control...

Ngày tải lên: 09/08/2014, 06:23

... character of SSC The properties of the feedback control system obtained according to the standard state control (SSC) procedure are independent of the state representation of the model of the ... question of defining the means of action necessary or useful for the achievement of the control objectives. The action magnitudes are reunited into a control vector noted by u. Any other means of ... consequently the rejection of the 412 Analysis and Control of Linear Systems the zeros of transmission of )( 12 sG and )( 21 sG . In addition, the remaining invariant zero are non-controllable modes...

Ngày tải lên: 09/08/2014, 06:23

... types of usage of this algebra are presented in the field of modeling and control. 16.5.1. Modeling One of the methods of signal and control processing consists of designing models capable of ... consists of seeking the controller in a factorized form: )( ~ )( ~ 1 λλ − QP 524 Analysis and Control of linear Systems Generally, the existence of the Euclidian division implies the existence of ... modeling of multi-component polynomial phase signals and the second is dedicated to the design of a pole placement control law. 16.1. Ring of non-commutative polynomials Let )(λΠ be the set of...

Ngày tải lên: 09/08/2014, 06:23

Ngày tải lên: 10/08/2014, 03:20

Ngày tải lên: 10/08/2014, 03:20

Ngày tải lên: 10/08/2014, 03:20