As the number of loops is increased, ideal dc operation is approached. The emf s add (series connection), and the developed torques aid each other. Multiple loops More uniform dc operation is achieved by using a number of loops displaced from each other in space. Although et and Td are now unidirectional ( remain in the same direction or sense), they do not represent steady dc operation because they fluctuate: each is maximum when the loop is in posi on 0, and zero when it is in posi on 2. Rotate RH fingers from the direction of the first vector, A1, to the direction of the second vector, A2, through the small angle (> et is always positive, & Td is always CW(when direct current supplied to brushes), but emf & current within loop oscillate. Page | 2 ELECTRICAL MACHINES Notes Dr.ģ AF BATI CHAPTER 1 : PRINCIPLE OF OPERATION SOME BASIC RULES Right hand screw rule (cross product operation in vector algebra) A1 X A2= A3 A1, A2, and A3 are vectors. TAYLOR DIRECT CURRENT MACHINES PITMAN, LONDON 1980. HANCOCK THE PERFORMANCE AND DESIGN OF DIRECT CURRENT MACHINES 3RD ED. LANGSDORF THEORY OF ALTERNATING CURRENT machinery 2ND ED. Theraja Bl, Theraja Ak ELECTRICAL TECHNOLOGY. FRIEDMAN DIRECT AND ALTERNATING CURRENT machinery 2ND ED. UNNEWEHR ELECTROMECHANICS AND electric MACHINES, 2ND ED. NASAR electric MACHINES AND ELECTROMECHANICS MCGRAW HILL(SCHAUM), NY 1981. MCPHERSON AN INTRODUCTION TO ELECTRICAL MACHINES and transformers WILEY, NY 1981. HUGHES ELECTRICAL TECHNOLOGY LONGMANS, LONDON. HINDMARSH ELECTRICAL MACHINES AND THEIR APPLICATIONS 4TH ED.Ģ PERGAMON, OXFORD 1984. GABRIEL BASIC ELECTRICAL ENGINEERING 5TH ED. DRAPER ELECTRICAL MACHINES 2ND EDITION, LONGMAN ,LONDON. DRAPER ELECTRICAL CIRCUITS INCLUDING MACHINES LONGMAN, LONDON 1972. DANIELS INTRODUCTION TO ELECTRICAL MACHINES MACMILLAN, LONDON 1976. COTTON ADVANCED ELECTRICAL TECHNOLOGY PITMAN, LONDON 1967. HAMILTON ELECTROMECHANICAL ENERGY CONVERSION MACMILLAN, NY 1984. AF BATI ELECTRICAL MACHINES REFERENCES: 1. mcgraw‐ġ Page | 1 ELECTRICAL MACHINES Notes Dr. langsdorf “ theory of alternating current machinery “ 2nd ed. nasar “ electric machines and electromechanics” mcgraw‐hill(schaum), ny 1981. Mcpherson” an introduction to electrical machines and transformers” wiley, ny 1981. HINDMARSH ELECTRICAL MACHINES AND THEIR APPLICATIONS 4TH ED.
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