Chapter 19: Alternating- Current Motors In General
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Electric Apparatus |
| Year | 1917 |
| Section ID | theory-calculation-electric-apparatus-chapter-17 |
| Location | lines 21713-23905 |
| Status | candidate |
| Word Count | 6936 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 3 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XIX ALTERNATING- CURRENT MOTORS IN GENERAL 171. The starting point of the theory of the polyphase and single-phase induction motor usually is the general alternating- current transformer. Coining, however, to the commutator motors, this method becomes less suitable, and the following more general method preferable. In its general form the alternating-current motor consists of one or more stationary electric circuits magnetically related to one or more rotating electric circuits. These circuits can be excited by alternating currents, or some by alternating, others by direct current, or closed upon themselves, etc., and connec- tion can be made to the rotating member either by ooIIesSsi rings— that is, to fixed points of the windings — or by commutator —that is, to fixed points in space. The alternating-current motors can he subdivided into two classes — thoseSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”... power applied. The appearance of such "dead points" in the speed curve is due to a mechanical defect — as eccentricity of the rotor — or faulty electrical design: an improper distribution of primary and secondary windings causes a periodic variation of the mutual inductive reactance and so of the effective primary inductive reactance, (2) or the use of sharply defined and im- properly arranged teeth in both elements causes a periodic magnetic lock (opening and closing of the magnetic circuit, (3) and so a tendency to synchronize at the speed correspondi ...Alternating current
Section titled “Alternating current”... of the theory of the polyphase and single-phase induction motor usually is the general alternating- current transformer. Coining, however, to the commutator motors, this method becomes less suitable, and the following more general method preferable. In its general form the alternating-current motor consists of one or more stationary electric circuits magnetically related to one or more rotating electric circuits. These circuits can be excited by alternating currents, or some by alternating, others by direct current, or closed upon themselves, etc., and connec- t ...Magnetism
Section titled “Magnetism”... general alternating- current transformer. Coining, however, to the commutator motors, this method becomes less suitable, and the following more general method preferable. In its general form the alternating-current motor consists of one or more stationary electric circuits magnetically related to one or more rotating electric circuits. These circuits can be excited by alternating currents, or some by alternating, others by direct current, or closed upon themselves, etc., and connec- tion can be made to the rotating member either by ooIIesSsi rings— th ...Radiation / light
Section titled “Radiation / light”... g members do not vary with their relative positions, ami those in which they vary with the relatifl positions of stator and rotor. In the latter a cycle of rotation exists, and therefrom the tendency of the motor results to lock at a speed giving a definite ratio between the frequency of rotation and the frequency of impressed e.m.f. Such motors, therefore, are synchronous motors. The main types of synchronous motors are as follows: 1. One member supplied with alternating and the other with direct current — polyphase or single-phase synchronous motors, ...Chapter-Local Concept Hits
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Chapter-Local Glossary Hits
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Equation Candidates
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Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
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theory-calculation-electric-apparatus-fig-151 | P&D Fig. 151. 180. As example are shown, in Fig. 151, with the speed as abscissae, the curves of a single-phase induction motor, having | line 23006 |
theory-calculation-electric-apparatus-fig-153 | are connected in series to the stator circuits, entirely different Fig. 153. characteristics result, and the motor no more tends to synchronize nor approaches a definite speed a… | line 23598 |
theory-calculation-electric-apparatus-fig-154 | .8 1.0 1.2 1.4 Fig. 154. 1.6 | line 23838 |
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Complex quantities: Track how Steinmetz preserves geometric rotation and quadrature while translating the same operation into symbolic form.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
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