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Power Processing, Part 1. Electric Machinery Analysis

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Power Processing, Part 1. Electric Machinery Analysis DOCONEIT MORE BD 179 391 SE 029 295,. a 'AUTHOR Hamilton, Howard B. :TITLE Power Processing, Part 1.Electic Machinery Analyiis. ) INSTITUTION Pittsburgh Onii., Pa. SPONS AGENCY National Science Foundation, Washingtcn, PUB DATE 70 GRANT NSF-GY-4138 NOTE 4913.; For related documents, see SE 029 296-298 n EDRS PRICE MF01/PC10 PusiPostage. DESCRIPTORS *College Science; Ciirriculum Develoiment; ElectricityrFlectrOmechanical lechnology: Electronics; *Fagineering.Education; Higher Education;,Instructional'Materials; *Science Courses; Science Curiiculum:.*Science Education; *Science Materials; SCientific Concepts ABSTRACT A This publication was developed as aportion of a two-semester sequence commeicing ateither the sixth cr'seventh term of,the undergraduate program inelectrical engineering at the University of Pittsburgh. The materials of thetwo courses, produced by a ional Science Foundation grant, are concernedwith power convrs systems comprising power electronicdevices, electrouthchanical energy converters, and associated,logic Configurations necessary to cause the system to behave in a prescribed fashion. The emphisis in this portionof the two course sequence (Part 1)is on electric machinery analysis. lechnigues app;icable'to electric machines under dynamicconditions are anallzed. This publication consists of sevenchapters which cW-al with: (1) basic principles: (2) elementary concept of torqueand geherated voltage; (3)tile generalized machine;(4i direct current (7) macrimes; (5) cross field machines;(6),synchronous machines; and polyphase asynchronous machines. (HM) a **0******************,**************************************************( * Reproductions supplied by EDRS are the best that canbe made * * from the original document. * Y e CT% 1. Co% U S. OII'AR1MNT Ca, HEALTH. f- moucotriceN a bviiIrAne NATIONAL INS muTe OF 11-4 I/01)CA TION 140, uME N I I4A Ot IN e PRO- Dts( ED e )(AC It y AS RISC Elver) t ROM LL1 THE PE R fON OR ORGANIZATION ORIGIN- AIINGII POIN IS OF VIEW OR OPINIONS TA1ED DO NO1 NFC f SSARIL Y R r PNE %E N I W F IAL NA IONAl INSTIILfle or Pout A'TION POSI 1 ION OR rOL Y "PERMISSION TO REPRODUCE THIS MATERIAL HAS BEEN GRANTED BY POWER PROCESSING TO 1HE EDUCATIONAL RESOURCES INFORMATION CENTER (ERIC)" fat PartI _ -4 fr "Electric Machinery Analysis ,1 Howard B. Hamilton ft University of Pittsbtirgh 1970 LAL .0'"" The preparation of this daterial has been partially supported by Grant GY-4138 entitled "Course Content improvement , Project for Power Processing" made to the University of Pittsburgh by the Nalional Science Foundation. Copyright, 1970 by Howard B. Hamilton 4 4 a, 4, GENERAL DESCRIPTION OF PROJECT The overall objectiVe' of the project was development of a model two semester sequence of lecture-laboratory courses, senioryhr level,to prepare t he undergraduate student with the necessary background in electric machinery t, and to present the fundamental concepts of modeling power processing devices and circuits necessary for future professional activity in Power Processing. Itis felt that the development of this sequence of courses will be of vital interest to educators.It will strengthen the Electrical Engineering curriculum because it will accomplish the following: 1. make the electric machinery.and power topics much Nv. more interesting and meaningful to the student. 2.better preparation, for the student, for a productive professional career in this vital area. 3.reinforce the learning gleaned from earlier courses in logic theory and solid state electronics. Courses involving the theory of electric machinery and associated phenomenon have always been an integral part of the electrical engineering undergraduate curriculum.Prior to 1950, colleges and universities were in more or less geneial agreement concerningthe portion of the total curriculum devoted to electric machinery (and power) and to the specific course content. The technological.: developments associated with the 1940's placed tremendous pressures upon the curriculum.The phenomena associated with new technologies such as solid state theory, control system analysis etc. had 4 00 3 to be included and at the same time, the total time available forthe first degree was even decreased in many instances.These pressures resulted in elimination or suppression of the "how-to-do" type courses and also resulted, in a reduction of time allotted to certain areas within the currkula.The courses in electric machinery and power were victims of the latter economy. Usually, the electrical machinery (pre 1950) consisted of detailed study of t he physical bspects ,of the particular machine and from these aspects, the input-output characteristics were -deduced for the static, or steady state situation.Coincident withthe widespread introduction of control system, or servo meclianisms, the time allotted for machinery was again reduced sothat the majority of colleges and universities attempted to optimize the machinery offeringS by presenting the subject matter as if it consisted of devices with input output terminals and considering that only these aspects of the machine were necessary for study ofr-the machine in dynamic systems.The rationale for this approach was that only a very small percentage of the students were interested in, or would be professionally involved -in, the design of the machine.The power courses usually werecompleteiy eliminated from the curriculum. The past few years have seen tremendous strides in the areas of solid state electronks and digital logic theory.The potential applications and useage of these technologies, taken in combination, ale just beginning tobe aripleciated.The useage of these phenomena in electric machinery control and in power systems has opened a new era of technology, i.e., "Power Processing" 5 4 or "Power Conditioning".As evidence of its importance and the fact that the rhole concept needs research and definition - the National Aeronautics and Space 'Administration,initi NASA Research Topics Bulletin SC/RTB-12, dated September 14,1966, stated: "Development and applkation trends in electric power processing (conditioning) indicate a need for further fundamental research to explore and define the principles, and theoretical and physical limitations of-related circuits and components.Expected beneficial results of such resecrech would include:a.The forlyulation of theoretical criteria for physically realizable power processing circuits and systems. b.The provision of meaningful guides and objectives to researchers in related fields (e.g. magnetics, 'dielectrics, semi-conductors, etc.) and c.The establishment of long-range goals for component development through the rig6rous analysis and cluantitative identification of perfprmance limiting characteristics of components and related circuits". Several of the major .electrical manufacturers have substantial research efforts underway in this general area.Many of the engineers working in this area are European.Whether itis inclination, desire, availability, or prior education that results in this' manpower situation is pure conjecture.The facts that do emerge are that engineering students graduating from U.S. colleges and universities have not had an interest in electric machinery or power, they have not had formal training in the marriage of solid state devices, logic, and power systems, and they are not prepared to move into this important, challenging, aspect of electrical engineering. As further evidence of professionalconcert for including this type of material in the education and training\of engineers,it should be noted that thisis a topic of concetn to a group entitled,"Interagency Advanced Powr GroUp".This group has a Power Conditioning Panel (under the Electrical 6 5 Working Group).Itis composed of representatives from NASA, AFAP1, USAECOM and others.Indicative of their concern for this topic is the "Guest List" at their meeting of 8 December 1966.This list includes representatives from WestinghouseIHoneywell, Boeing, General Electric, TRW Systems, etc. as well as personnel from MIT and Duke University.In the meeting minutes, under paragraphs 2.14 and 2.15 appear the following: ..."The ultimate need (for work in this area) is a power systems engineer with broad education in electrical power engineerin including a working knowledge of communications and system t eory, 44 who understands the specified requirements and one who can communicate with his colleagues.Students are wary of going ito the field of conventional utifity type power engineering...they dre \ looking toward more challenging fields, as electric power processing ) could be if it were properly interpreted anci presented. Thus,it appears that a need does exist for educational courses (not "how-to" type training) that will better prepare undergraduates for productive careers in this field.Few, if any U.S. universities offer work with emphasis in Power Processing but there is discussion and interest, which manifests itself at pro- fessional meetings, in the topic. An ekareness of the above stimulated our interest in the course X --- development. The most descriptive assessment of the final orientation of the project is contained in the prefaces to PartI and Part II.rortions of ?Mese prefaces are as follows. A Quote from Preface to Power Processing, PartI This material was developed as a portion of a two course sequence concerned with power conversion sMemst. comprising power electronic devices, electro-mechanical energy converters andssockited logic configurations necessary to cause the system to behave
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