anaesthetic machines and ventilators

... Voltage and Frequency 7.4 Operation from a Source of Variable Frequency and Voltage 7.5 Controllers for PMAC Machines 7.6 Brushless DC Machines 81 81 81 82 82 Line Controlled Rectiers 8.1 1- and ... understanding of modern machines and drives Power electronics are introduced, at the device and systems level, and electrical drives are discussed Equations are kept to a minimum, and in the examples ... amplitudes and v , and initial phases, i and v , and the same frequency, = 2/T 2f : i v(t) i(t) = v sin(t + v ) = sin(t + i ) i (1.2) (1.3) In this case the rms values of the voltage and current...

Ngày tải lên: 25/01/2014, 13:20

... steps low and S1 and S2 are opened and S3 and S4 are close The armature * current decreases until ia = ia − ε , at which time the comparator output becomes high; S1 and S2 are closed and S3 and S4 ... 10.11-2) When the output of this comparator (L) is high, S1 and S2 are closed and S3 and S4 are open; when L is low, S3 and S4 are closed and S1 and S2 are open The action of this type of current control ... state, which occurs over interval A, S1 and S2 are closed and S3 and S4 are open The second state occurs over interval B, wherein the S3 and S4 are closed and S1 and S2 are open As in the case of the...

Ngày tải lên: 16/02/2014, 18:48

Ngày tải lên: 16/02/2014, 19:02

... e.g Lee and Myaeng’s (2002) genre and subject detection work and Boulis and Ostendorf’s (2005) work on feature selection for topic classification For our LM classifiers, we followed Boulis and Ostendorf’s ... development and test sets The dev and test sets are the same size and each consist of approximately 5% of the data for each grade level measures For comparison to other methods, e.g Flesch-Kincaid and ... results Figures and show DET curves for this set of classifiers on the development set and test set, respectively The grade and classifiers have the best performance, probably because grade and must be...

Ngày tải lên: 20/02/2014, 15:20

Ngày tải lên: 22/02/2014, 08:20

... of the wipers and whipping tendencies For this wiper system, like most machines, understanding and analyzing the motion is necessary for proper operation These types of movement and motion analyses ... different parts One connects the handle to the base and is labeled as joint A Another connects link to the handle and is labeled as joint B Another connects link to the base and is labeled as C Another ... Problems 23 and 48 FIGURE P1.25 Problems 25 and 50 Introduction to Mechanisms and Kinematics Problems in Calculating Mobility Specify the number of links and the number of joints and calculate...

Ngày tải lên: 08/04/2014, 11:36

... and practitioners, cover a large part of the field of electric machines and drives Various types of electric machines, including three-phase and single-phase induction machines or doubly fed machines, ... machine, novel principles and designs have been appearing and the properties and parameters of electric machines have been steadily improving The advent of power electronics and modern control circuitry ... in the stator and the rotor windings, and magnetic losses (hysteresis and eddy current losses) in the cores Other losses include mechanical (bearing friction and ventilation), and stray load...

Ngày tải lên: 21/06/2014, 01:20

... 10 Electric Machines and Drives C390-98 Today more than 75 % of the motors sold in North America are Premium efficiency and EPAct machines This clearly indicates the positive ... combination of technical and promotional information, educational tools and financial incentives If technicians and engineers would be trained in system design integration and least lifecycle cost ... legislate against recalcitrant and to impose to market the gradual approach of the « carrot and the stick », where the carrot represents the incentives and the stick stands for refractory The authors...

Ngày tải lên: 21/06/2014, 01:20

... = and K = with e 3 sin cos 2 xqd and x stand for two-dimensional voltage ux and stator current vector, respectively on (q-d) and (-)reference frame The relations between mechanical and electrical ... accelerated to 150 rad/s at 0.5 s and then decelerated in steps to 100 rad/s, 50 rad/s and 10 rad/s at 1.5 s, s and 4.5 s respectively Fig 17 shows the estimation results and response of the loaded ... parameter estimation in induction machines IFAC Symposium on Nonlinear Control System Design, Bordeaux, France, pp 77-82 96 Electric Machines and Drives Verghese, G C & Sanders, S R (1988) Observers...

Ngày tải lên: 21/06/2014, 01:20

... variables1 prime mover torque and speed, (τLG , ω G ), and rotor and stator voltages and currents, (vrG , irG ), (vsG , isG ), respectively The IM, on the other hand, is a two–port system with ... hand, is a two–port system with port variables motor load torque and speed, (τLM , ω M ), and stator voltages and currents The DFIG and the IM are coupled through the interconnection vsG isG = = ... has the units of power 116 Electric Machines and Drives of the fully laminated cores is assumed to be infinite, and saturation, iron losses, end winding and slot effects are neglected Only linear...

Ngày tải lên: 21/06/2014, 01:20

... IM speed and to keep internal signals bounded Figure 14 shows the DFIG rotor currents irGa and irGb, and their references over a period of time Again, these currents are sinusoidal and bounded ... control law (with K p and Ki are proportional and integral gains) is given below: d d BvrG = B K p (isG isG ) + Ki (isG isG ) (78) 138 (V) rGa rGb 50 &v Electric Machines and Drives v 50 mM & ... IM speed and to keep internal signals bounded Figure 30 shows the DFIG rotor currents irGa and irGb, and their references over a period of time Again, these currents are sinusoidal and bounded...

Ngày tải lên: 21/06/2014, 01:20

... parameters of the induction machines without the requirement of any previous test and derivative filters Simulation 158 Measured and simulated currents Electric Machines and Drives isd(measured) ... (23) where k pi = 152 Electric Machines and Drives The reference model given by is rewritten as Wm (s) = k m Zm s + z0 = km , Rm s + p1 s + p0 (24) and from the plant and reference model assumptions ... measured currents Figures 11 and 12 shows the transient currents from axis q and d, respectively, while Figures 13 and 14 shows the steady-state currents from axis q and d, respectively From Figures...

Ngày tải lên: 21/06/2014, 01:20

... Applications (a) The power sharing between FC and SC on NEDC driving cycle (b) The power sharing between FC and SC on FTP75 driving cycle 191 192 Electric Machines and Drives (c) The Comparative of the ... J : inertia of motor λds,qs : stator flux(d and q axis) : rotor flux(d and q axis) λdr,qr Vds,qs : stator voltage (d and q axis) : stator current (d and q axis) ids,qs M : mutual inductance References ... and Magnetizing Flux Saturation Modeling in Stationary Frame Reference of Single and Two –Phase Induction Machines , IEE 2000, Conf power Elec & Variable Speed Drives, 140146 Sundstrom Olle and...

Ngày tải lên: 21/06/2014, 01:20

... references and estimated values of torque and flux magnitude and also uses the position of the estimated flux vector The torque and flux magnitude error signals are the inputs to the torque and flux ... + eqs (49) (50) assuming the terms eds and eqs as feed-forward elements and given by (51) and (52), and considering the terms that indicate the asymmetry and disturbance negligible: eds = − Lsrd ... Lasbr(bras), Larbs(bsar) and Lasar(aras), Lbsbr(brbs) are the mutual inductance between the stator and rotor windings Since the stator windings are in space quadrature and asymmetric, and the rotor windings...

Ngày tải lên: 21/06/2014, 01:20

... 230 Fig Commanded and estimated torque (Nm) Fig 10 Commanded and estimated flux Fig 11 Stator currents in stator flux reference frame Electric Machines and Drives Space Vector PWM-DTC ... 246 Electric Machines and Drives It is clear, that as the other methods the determination of the tetrahedron T ( x , y , z ) allows the selection of the three vectors Vx , Vy and Vz , and the calculation ... applied in both frames a − b − c and α − β − γ in the same way The switching states x , y and z or the voltage vectors Vx , Vy and Vz are independent of the coordinates and are determined only from...

Ngày tải lên: 21/06/2014, 01:20

... of voltage and current control for distributed generation systems,” IEEE Trans Energy Convers., vol 21, no 2, pp 516–526, Jun 2006 258 Electric Machines and Drives [5] C A Quinn and N Mohan, ... Portillo,E Galvan and J M Carrasco, "A SVM3D generalized algorithm for multilevel converters" Proc IEEE IECON.'03, 2003 pp 24-29 260 Electric Machines and Drives [36] M Aredes, J Hafner, and K Heumann, ... Humberto Pinheiro Hilton A Griindling, Jose R Pinheiro and Helio L Hey, “On the Space Vector Modulation and Limiting 262 Electric Machines and Drives Algorithms for Three-phase Four-Leg Voltage...

Ngày tải lên: 21/06/2014, 01:20

... nature, and it is classified as one type of random search techniques Various candidate solutions are tracked during the search procedure in the system, and the population evolves until a candidate ... www.intechopen.com (36) 30 Mechatronic Systems, Simulation, Modelling and Control N 0,  is a random Gaussian number with mean zero and standard deviation  where We replaced the static parameter  ... convergence reliability and velocity of a genetic algorithm In this case, we have full control over the parameter and its value at time t and they are completely determined and predictable We set...

Ngày tải lên: 27/07/2014, 23:28

... Voltage and Frequency 7.4 Operation from a Source of Variable Frequency and Voltage 7.5 Controllers for PMAC Machines 7.6 Brushless DC Machines 81 81 81 82 82 Line Controlled Rectiers 8.1 1- and ... understanding of modern machines and drives Power electronics are introduced, at the device and systems level, and electrical drives are discussed Equations are kept to a minimum, and in the examples ... amplitudes and v , and initial phases, i and v , and the same frequency, = 2/T 2f : i v(t) i(t) = v sin(t + v ) = sin(t + i ) i (1.2) (1.3) In this case the rms values of the voltage and current...

Ngày tải lên: 27/07/2014, 23:33

... dispensing machines and/ or mobile vans, of which 18 focused on dispensing machines and 22 on mobile vans Results Introduction of dispensing machines and mobile vans to NSP Syringe dispensing machines ... countries including Switzerland, Germany, France, Italy, the Netherlands, Austria, and also in Australia and New Zealand These are automatic commercial dispensing machines that exchange new for ... and safer injecting advice has been provided Services through dispensing machines and mobile vans have been reported to be responsive to a wider range of IDUs and most importantly to hidden and...

Ngày tải lên: 11/08/2014, 18:20

... in Scotland by Charles Macintosh in 1823 How Machines Work S ome machines are simple, while others are complex Simple machines simple work like pushing, pulling, and lifting Complex machines ... are a collection of simple machines They perform complex tasks like drilling, printing, computing, transporting, and flying Wheel and Axle A wheel and axle is really two machines in one because ... Bell  History of Inventions H umans have been inventing machines for thousands of years Early machines include the wheel, plough, catapult, and writing tools The invention of the plough gave rise...

Ngày tải lên: 27/10/2014, 17:24