Practical electrical engineering, direct currents; a manual for use in industrial and evening schools and for home study - Softcover
Synopsis
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. 1922 Excerpt: ...Air-gap. (4) Armature core. (c) Commutator and Brushes. 6. CONSTRUCTION OF GENERATOR: (a) Stationary parts: (1) Field frame or yoke. (2) Pole pieces. (3) Pole shoes. (4) Field windings. (5) Brushes. (6) Brush holder. (7) Brush rigging. (8) Brush bus. (9) End bells and bearings. (b) Rotating parts: (1) Armature core. (2) Armature winding: Lap winding. Wave winding. (3) Commutator. (4) Shaft. (6) Oiling rings. (c) Air-gap. 7. ACTION OF COMMUTATOR. 8. USE OF MULTI-COILS. 9. GENERATOR EXCITATION: (a) Separate excitation. (6) Self-excited generator: (1) Shunt generator. (2) Series generator. (3) Compound generator: Short shunt. Long shunt. 10. GENERATOR CHARACTERISTICS: (a) Separately Excited: (1) No-load characteristic. (2) Speed characteristic. (3) Load characteristic. (b) Shunt: (1) No load characteristic. (2) Speed characteristic. (3) Load characteristic. (c) Series: (1) Magnetization curve. (2) Load characteristic. (2) Compound: (1) Cumulative: Flat Compounded. Over-compounded. (2) Differentially compounded Generator. 11. VOLTAGE REGULATION OF GENERATOR. 12. LOSSES IN GENERATOR: (a) Stray Power Losses: (1) Iron or Core Loss: Eddy Current losses. Hysteresis. (2) Friction or Mechanical Losses: Bearing friction. Brush friction. Windage. (b) Copper Losses: (1) Loss in armature winding. (2) Loss in field winding. (3) Losses in other windings. 13. EFFICIENCY OF GENERATOR: (a) Definition. (b) How Determined: (1) Directly. (2) Indirectly. 14. ARMATURE REACTION: (a) Definition. (b) Neutral plane. (c) Illustration of action by use of Vectors. Effects of Brush Shifting. id) Effects of Armature Reaction shown by Flux Diagram. (c) Methods of Reducing Armature Reaction: (1) Compensating coils. (2) Reduction of armature flux by reluctance in its path. (3) Use of saturated...
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