Electric motor Wikipedia. An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this is the conversion of mechanical energy into electrical energy and is done by an electric generator, which has much in common with a motor. Most electric motors operate through the interaction between an electric motors magnetic field and winding currents to generate force. In certain applications, such as in regenerative braking with traction motors in the transportation industry, electric motors can also be used in reverse as generators to convert mechanical energy into electric power. Found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives, electric motors can be powered by direct current DC sources, such as from batteries, motor vehicles or rectifiers, or by alternating current AC sources, such as from the power grid, inverters or generators. Small motors may be found in electric watches. General purpose motors with highly standardized dimensions and characteristics provide convenient mechanical power for industrial use. The largest of electric motors are used for ship propulsion, pipeline compression and pumped storage applications with ratings reaching 1. Electric motors may be classified by electric power source type, internal construction, application, type of motion output, and so on. Electric motors are used to produce linear or rotary force torque, and should be distinguished from devices such as magnetic solenoids and loudspeakers that convert electricity into motion but do not generate usable mechanical powers, which are respectively referred to as actuators and transducers. Cutaway view through stator of induction motor. Learn about academic programs, competitions and awards from Microsoft Research including academic scholarships, and our graduate fellowship programs. Questions and Answers from the Community. Maybe the size of mouse you are giving him is too big. Make sure the mouse is hot enough. An Electronic Nose is a system that uses the pattern of. Determine the odor. How to Work LabVIEW. Enter the file name. Enter Sample Code. Choose Autoscaling. Universal Current Sensor Ppt' title='Universal Current Sensor Ppt' />HistoryeditEarly motorsedit. Faradays electromagnetic experiment, 1. Perhaps the first electric motors were simple electrostatic devices created by the Scottish monk Andrew Gordon in the 1. The theoretical principle behind production of mechanical force by the interactions of an electric current and a magnetic field, Ampres force law, was discovered later by Andr Marie Ampre in 1. The conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the English scientist Michael Faraday in 1. A free hanging wire was dipped into a pool of mercury, on which a permanent magnet PM was placed. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a close circular magnetic field around the wire. This motor is often demonstrated in physics experiments, brine substituting for toxic mercury. Though Barlows wheel was an early refinement to this Faraday demonstration, these and similar homopolar motors were to remain unsuited to practical application until late in the century. CI/CI6556_MAIN_161890.jpg' alt='Universal Current Sensor Ppt' title='Universal Current Sensor Ppt' />Standard Size Thermocouple Connectors. Description. OST is a legacy design. Whenever it is the only choice it is plug compatable with the OSTW standard. Jedliks electromagnetic self rotor, 1. Museum of Applied Arts, Budapest. The historic motor still works perfectly today. In 1. Hungarianphysicistnyos Jedlik started experimenting with electromagnetic coils. After Jedlik solved the technical problems of the continuous rotation with the invention of the commutator, he called his early devices electromagnetic self rotors. Although they were used only for instructional purposes, in 1. HANNA HI 700636 Electrode Cleaning Solution, 20ml HANNA HI 700663 Electrode Cleaning Solution, 20ml Ordered Wrong Item 500 OrbecoHellige SC45000 SC450 Colorimeter. Huge List of Computer Science CSE Engineering and Technology Seminar Topics 2017, Latest Tehnical CSE MCA IT Seminar Papers 2015 2016, Recent Essay Topics, Speech. Jedlik demonstrated the first device to contain the three main components of practical DC motors the stator, rotor and commutator. The device employed no permanent magnets, as the magnetic fields of both the stationary and revolving components were produced solely by the currents flowing through their windings. Success with DC motorseditAfter many other more or less successful attempts with relatively weak rotating and reciprocating apparatus the Prussian Moritz von Jacobi created the first real rotating electric motor in May 1. His motor set a world record, which was improved only four years later in September 1. Jacobi himself. 1. His second motor was powerful enough to drive a boat with 1. Automotive-Sensors11.png' alt='Universal Current Sensor Ppt' title='Universal Current Sensor Ppt' />It was not until 1. The first commutator DC electric motor capable of turning machinery was invented by the British scientist William Sturgeon in 1. Following Sturgeons work, a commutator type direct current electric motor made with the intention of commercial use was built by the American inventor Thomas Davenport, which he patented in 1. The motors ran at up to 6. Due to the high cost of primary battery power, the motors were commercially unsuccessful and Davenport went bankrupt. Several inventors followed Sturgeon in the development of DC motors but all encountered the same battery power cost issues. No electricity distribution had been developed at the time. Like Sturgeons motor, there was no practical commercial market for these motors. In 1. 85. 5, Jedlik built a device using similar principles to those used in his electromagnetic self rotors that was capable of useful work. He built a model electric vehicle that same year. A major turning point in the development of DC machines took place in 1. Antonio Pacinotti described for the first time the ring armature with its symmetrically grouped coils closed upon themselves and connected to the bars of a commutator, the brushes of which delivered practically non fluctuating current. The first commercially successful DC motors followed the invention by Znobe Gramme who, in 1. Pacinottis design. In 1. 87. 3, Gramme showed that his dynamo could be used as a motor, which he demonstrated to great effect at exhibitions in Vienna and Philadelphia by connecting two such DC motors at a distance of up to 2 km away from each other, one as a generator. See also 1. 87. 3 lexprience dcisive Decisive Workaround. Usb Mouse Trackball Hack: Full Version Software. In 1. Frank Julian Sprague invented the first practical DC motor, a non sparking motor that maintained relatively constant speed under variable loads. Other Sprague electric inventions about this time greatly improved grid electric distribution prior work done while employed by Thomas Edison, allowed power from electric motors to be returned to the electric grid, provided for electric distribution to trolleys via overhead wires and the trolley pole, and provided controls systems for electric operations. This allowed Sprague to use electric motors to invent the first electric trolley system in 1. Richmond VA, the electric elevator and control system in 1. Chicago by the South Side Elevated Railway where it became popularly known as the L. Spragues motor and related inventions led to an explosion of interest and use in electric motors for industry, while almost simultaneously another great inventor was developing its primary competitor, which would become much more widespread. The development of electric motors of acceptable efficiency was delayed for several decades by failure to recognize the extreme importance of a relatively small air gap between rotor and stator. Efficient designs have a comparatively small air gap. The St. Louis motor, long used in classrooms to illustrate motor principles, is extremely inefficient for the same reason, as well as appearing nothing like a modern motor. Application of electric motors revolutionized industry. Industrial processes were no longer limited by power transmission using line shafts, belts, compressed air or hydraulic pressure. Instead every machine could be equipped with its own electric motor, providing easy control at the point of use, and improving power transmission efficiency. PPT The Application of Data Mining Power. Point presentation free to view. Title The Application of Data Mining 1. The Application of Data Mining in Health Research. Li Xiaosong, M. D., M. P. H., Ph. D. Prof. Biostatistics School of Public Health Sichuan University 2. Knowledge discovery in databases KDDWith the rapid development of the Information Industry, great advances have been made in data production and collection capacities,however, the conflict of rich data but pool knowledge is getting increasingly evident. It is the Knowledge discovery in databases that cater the demand Data mining. Data tomb Knowledge 4. Data Mining DM In the face of vast databases, how to discover the hidden but useful knowledge from data, which can help in the government and enterprises decision making, so as to get more benefit had become an important problem to solve. DMData Knowledge Data Mining is the procedure of distilling the unknown but potentially valuable information and knowledge from plentiful data which is uncompleted, misty and stochastic 5. Data Mining A KDD Process. Knowledge. Data mining the core of knowledge discovery process. Pattern Evaluation. Data Mining. Task relevant Data. Selection. Data Warehouse. Data Cleaning. Data Integration. Databases 6. Classification of Data Mining technology Association Rule Mining Classification and Predicting Clustering Analysis Trend Analysis Patten Analysis 7. The Application of Data Mining Banking Telecom Economy Meteorology Agriculture Health care Military 8. Data Mining applied in health care The application of data mining in medical and health researches had prove itself to be effective, showing great development potentialities Now data mining has become a key method in obtaining information in clinical medicine, biomedicine, pharmacy and public health 9. Data Mining applied in Clinical Research Finding the relationship among diseases Searching the rule of disease development and prevalence Disease diagnosis and treatment Summarizing therapeutic effects e. Bayes classification decision tree classification in disease diagnosis 1. Data Mining applied in Biomedicine A powerful tool in DNA analysis Using Sequence Model Analysis Similarity Retrieval to find the gene sequence model for certain kind of diseases Data Cleaning Data integration is valuable in the data integration and database building of gene Association Rules Analysis can help to discover Gene crossover and correlation in a Genome 1. Data Mining applied in Public Health Spatio temporal Data Mining used in infectious diseases monitoring to search for the epidemic rules and distribution characteristics of diseases Using Time Series Analysis, Neural Networks to predict the incidence and infant mortality rate of infectious diseases Association Rules to discuss the influencing factors of diseases and health seeking behavior Clustering and classification are now widely used in the decision support system for health insurance 1. Application of Association Rules in Medical Data Analysis Association Rules aims to find out the relationship among valuables in database, resulting in deferent types of rules. Table 1original data from a research on heart disease LAD The percentage of heat disease caused by left anterior descending coronary artery RCA The percentage of heat disease caused by right coronary artery 1. Results Table. 2 Medical Association Rules Rule 1 indicates. RCA5. 0 is 1. 00 Rule 2 indicates. LAD7. 0 is 1. 00 1. The future application of Data Mining in medical research. Data Mining is based on a series of new data process technology Wavelets Analysis Neural Networks Genetic Algorithm Fuzzy Logic Reasoning 1. Challenges facing Data Mining The data of medical research are always complicated and unique in types and structures To integrate the specialized knowledge of both medical and data processing staffs Plenty of data and repeatedly practices are needed Targets To form a real useful data mining system for health research 1. Backpropagation Neural Networks BPNNs A type of artificial neural network A way to model highly complex, nonlinear solutions to classification problems Useful in classifying health related phenomena 1. Classification of smoking cessation status with BPNNClassifier performance estimates The confidence intervals of Az for both the BPNN and logistic classifiers are narrow And exceeds random chance Az. The finding indicates the performance of both classifiers exceeds that of random chance Az area under receiver operating characteristic curve 1. Classification of smoking cessation status with BPNNBinormal conventional ROC curves for BPNN and logistic regression classifiers. The graph illustrates the estimated true positive fraction TPF at multiple values of the false positive fraction FPF The areas under the ROC curve differ at a. ROCreceiver operating characteristic 1.