speed control of induction motor using pwm technique 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 ... prevailing one in closed-loop control of induction motors fed from PWM inverters. Explanation of this method however requires at first the introduction of the notion of the space vector. Let us...

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Ngày tải lên: 13/11/2014, 06:43

... effect on the functional activ- ity of TC. Arrows show the hypothetical movement of the domains after attachment of Cbl, see the main text. Mapping of transcobalamin using antibodies S. N. Fedosov ... the involvement of the other parts of TC in Cbl binding. However, we do not think that ligand binding occurs exclusively at the C-terminus of TC. Conjugation of a Cbl derivative to TC [10], analysis of alignments ... absence of S-S bonds and the low number of conserved residues in this part of the sequence. Only later did the large N-terminal unit become involved in the binding of Cbl [13,14]. Assembly of two...

Ngày tải lên: 20/02/2014, 01:20

... hypernym of X if X is a (kind of) Y. ã Hyponym(Hypo): X is a hyponym of Y if X is a (kind of) Y. ã Holonym(Holo): Y is a holonym of Y if X is a part of Y. ã Meronym(Mero): X is a meronym of Y if ... performance of using this similarity function with that of using the mutual in- formation based functions, i.e., s MIBL and s MIImp . The experiments are conducted over two types of queries, ... the use of WordNet in query expansion has been studied by various researchers, the im- provement of retrieval performance is often lim- ited. Voorhees (Voorhees, 1994) expanded queries using a...

Ngày tải lên: 17/03/2014, 02:20

... Gain Several of our algorithms for database operations are only able to use a subset of the capabilities of the GPUs. In these cases, we have observed a speedup of nearly a factor of 2 to 4 times ... MAX, all of which can be implemented using the counting capability of the occlusion queries on GPUs. To perform these operations on a relational table using GPUs, we store the attributes of each ... extremely fast and are capable of processing tens of millions of geometric primitives per second. The peak performance of GPUs has been increasing at the rate of 2.5 − 3.0 times a year, much...

Ngày tải lên: 23/03/2014, 12:20

... distribution of the parts -of- speech of all occurrences of the unknown words in a document which have the same lexical form. We suppose that such parts- of- speech have correlation, and the part -of- speech of ... marginal distribution of the part -of- speech of the kth occurrence of the un- known words given a set of local contexts w, and is calculated as an expected value over the distri- bution of the unknown ... the POS tag of the kth occurrence of the unknown words, let w k denote the local context (e.g. the lexical forms and the POS tags of the surrounding words) of the kth oc- currence of the unknown...

Ngày tải lên: 23/03/2014, 18:20

... forearm of each subject, thereby emulating the use of a prosthetic hand. The goal of the current study was to test the feasibility of the proposed control method, in particular the feasibility of ... specific control method used (e.g., proportional, discrete control) as well as on the mechan- ical characteristics of the prosthesis (e.g., speed of open- ing and closing). For the controller ... with the cut-off frequencies set at 5 and 500 Hz. The amplifiers were custom made at the Centre for Sensory -Motor Interaction and used previously in a number of motor control studies. Control algorithm The...

Ngày tải lên: 19/06/2014, 08:20

... ranging from 10 to 40. There are total of 200 networks for each value of the sensitivity. The left columns of Figures 1–5 are the histograms of the distribution of the true state-transition error ... face of small sample sizes, particularly because the number of variables in the system (e.g., genes) typically greatly outnumbers the number of observations. Thus, estimates of the errors of a ... Jensen, “Evolution as a self-organized critical phenomenon,” Proceedings of the National Academy of Sc iences of the United States of America, vol. 92, no. 11, pp. 5209–5213, 1995. [16] I. Shmulevich...

Ngày tải lên: 22/06/2014, 00:20

... of recommendations during the life of the project, had a significantly lower average pre-weaning mortality compared to the control farms (8.6% ± 3.6 vs 15.6% ± 4.3; p<0.05). One of the control ... of preweaning diarrhoea to improve speed and accuracy of laboratory diagnosis. The third part of the project seeks to improve the production and efficacy of locally-manufactured E. coli vaccines. ... (Diagnosis and control of diarrhoea in suckling pigs) began with three objectives to solve this problem: 1. Production and testing of locally-produced E. coli vaccines 2. Development of a management...

Ngày tải lên: 22/06/2014, 12:20

... zone for ease of implementation of the project. NIPP handled all aspects of the project north of the city of Danang in central Vietnam, while SOFRI was in charge of the project south of Danang ... appropriateness of these, provide a rating of the appropriateness of each design feature using the scale listed below. Description of design feature Appropriateness Rating (a) Construction of a processing ... management techniques, in particular the environmentally friendly spot spray method of controlling fruit flies using 3.3 Sectoral Impact Many farms in rural Vietnam rely on family labour, which often...

Ngày tải lên: 22/06/2014, 13:20

... together to control different aspects of embryonic development [23]. A co-RNAi screen identifies modifiers of the Pten- dsRNA-induced cell shape phenotype Part of the success of using Drosophila ... predicted cell-cycle regulators. The ‘Profile’ column provides a summary of the phenotypic profiles distinguishing sets of genes involved in specific stages of the cell cycle. The ‘Classification’ ... optional induction of a cell behavior, followed by detection of luminescent or fluorescent signals using a plate reader or an automated microscope. Here, we describe the establishment of an RNAi...

Ngày tải lên: 06/08/2014, 18:20

... 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. ... outputs of an induction motor, we can use this motor controller to control an induction machine. ã TMS320F243 DSP controller. This is manufactured by the Texas Instruments Company and is one of ... 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

Ngày tải lên: 17/12/2013, 18:06

... : Algorithm of the proposed MPPT control method. Fig.7: Wind turbine output power without MPPT control method for low wind speed. Fig.8: Wind turbine output power with MPPT control method ... output power with MPPT control method at low wind speed. The use of the MPPT converter imposes a low DC bus voltage to recover the wind energy at the low winds speeds. PWM : d ‹— d 0 Measure ... Search rules of the various cases of operation are summarized in the table I. Fi g.4. Operation modes of buck boost converter 2 Unlike constant -speed control, a variable -speed control can...

Ngày tải lên: 03/01/2014, 19:15