Chapter 21: Alternating-Current Generator
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Alternating Current Phenomena |
| Year | 1916 |
| Section ID | theory-calculation-alternating-current-phenomena-chapter-21 |
| Location | lines 22302-23970 |
| Status | candidate |
| Word Count | 2685 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 3 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XXI ALTERNATING-CURRENT GENERATOR 185. In the alternating-current generator, e.m.f. is generated in the armature conductors by their relative motion through a constant or approximately constant magnetic field. When yielding current, two distinctly different m.m.fs. are acting upon the alternator armature — the m.m.f. of the field due to the field-exciting spools, and the m.m.f. of the armature current. The former is constant, or approximately so, while the latter is alternating, and in synchronous motion relatively to the former; hence fixed in space relative to the field m.m.f., or uni- FiG. 129. directional; but pulsating in a single-phase alternator. In the polyphase alternator, when evenly loaded or balanced, the result- ant m.m.f. of the armature current is more or less constant. The e.m.f. generated in the armature is due to the magnetic flux passing throughSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”CHAPTER XXI ALTERNATING-CURRENT GENERATOR 185. In the alternating-current generator, e.m.f. is generated in the armature conductors by their relative motion through a constant or approximately constant magnetic field. When yielding current, two distinctly different m.m.fs. are acting upon the alternator armature — the m.m.f. of the field due to the field-exciting spools, and the m.m.f. of the armature current. The former is constant, or approximately so, while the latter is alternating ...Impedance / reactance
Section titled “Impedance / reactance”... ereby of the resultant e.m.f., will take place in this case only when the magnetic densities are so near to saturation that the rise of density at the leading pole corner will be less than the decrease of density at the trailing pole corner. Since the internal self-inductive reactance of the alternator itself causes a certain lag of the current behind the generated e.m.f., this condition of no displacement can exist only in a circuit with external negative reactance, as capacity, etc. ALTERNATING-CURRENT GENERATOR 2G1 If the armature current lags, it ...Magnetism
Section titled “Magnetism”CHAPTER XXI ALTERNATING-CURRENT GENERATOR 185. In the alternating-current generator, e.m.f. is generated in the armature conductors by their relative motion through a constant or approximately constant magnetic field. When yielding current, two distinctly different m.m.fs. are acting upon the alternator armature — the m.m.f. of the field due to the field-exciting spools, and the m.m.f. of the armature current. The former is constant, or approximately so, while the latter is alter ...Alternating current
Section titled “Alternating current”CHAPTER XXI ALTERNATING-CURRENT GENERATOR 185. In the alternating-current generator, e.m.f. is generated in the armature conductors by their relative motion through a constant or approximately constant magnetic field. When yielding current, two distinctly different m.m.fs. are acting upon the alternator ...Chapter-Local Concept Hits
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Chapter-Local Glossary Hits
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Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-alternating-current-phenomena-fig-129 | former; hence fixed in space relative to the field m.m.f., or uni- FiG. 129. directional; but pulsating in a single-phase alternator. In the polyphase alternator, when evenly lo… | line 22319 |
theory-calculation-alternating-current-phenomena-fig-130 | be assumed as constant. Fig. 130. The relative position of the armature m.m.f. with respect to | line 22363 |
theory-calculation-alternating-current-phenomena-fig-131 | excitation, increases the voltage; with lagging current it weakens Fig. 131. the field, and thereby decreases the voltage in a generator. Ob- viously, the opposite holds for a s… | line 22406 |
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Field language: Field-pressure or field-gradient interpretations can be explored here only after the explicit source passage and modern engineering translation are kept distinct.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Dielectricity / capacity: A Wheeler-style reading may emphasize dielectric compression, field stress, and stored potential, but this page treats that as interpretation unless Steinmetz explicitly says it.
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