The Induction Motor and Other Alternating Current Motors; Their Theory and Principles of Design

The Induction Motor and Other Alternating Current Motors; Their Theory and Principles of Design

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...of the magnetic flux in the different circuits. It is clear that the Low Resistance Winding III, whose m.m.f. is X3, is closed through the leakage path p3, whose leakage flux is f3. The flux produced by X3, if acting alone, through the reluctance p is $3, not shown in the figure. The m.m.f. X2 of the High Resistance Winding II acts in series with the m.m.f. X3 so that its flux J8, not shown in the figure would, be $2 = X2 + p, if acting alone, and therefore if only X2 and X3 were acting upon the circuits, the flux 2 + s = (Xi + Xz)-4-p, would exist in the air-gap. These fluxes are prevented from becoming established through the existence of the m.m.f. Xi. 1 U. S. Patent No. 427,978, May 13, 1890. 1 "General Characteristics of Electric Ship Propulsion Equipments." By E. F. W. Alexanderson. General Electric Review, April, 1919. To fix ideas we also represent in Fig. 88 the electric circuits to which this type of motor is equivalent, assuming a ratio of transformation of one to one. As both rotor windings have Fio. 86.--Arrangement of slots of double-squirrel cage motor. the same slip, the variation in speed corresponds to a transformer with variable resistances, as indicated in the Fig. 88, viz., r2.. s and r3 + s (106) Fio. 87.--The leakage paths of the magnetic cirouit of the double-squirrel cage motor. We begin with Winding III. Its resultant flux is Fa. This flux sets up the e.m.f. which sends current through the ohmic resistance of the Low Resistance Winding III. This e.m.f. is equal to e3 = 2.12(i-2)z3F310-8 volts (107) Fio. 88.--Equivalent transformer circuits for double-squirrel cage induction motor. Fio. 89.--The diagram of fluxes of the double-squirrel cage motor. The current produced by this e.m.f. is equal to i3--e3-5-rt. more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236510127
  • 9781236510129