Chapter 18: Polyphase Induction Motors
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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-18 |
| Location | lines 17717-20445 |
| Status | candidate |
| Word Count | 5758 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 7 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XVIII POLYPHASE INDUCTION MOTORS 155. The induction motor consists of a magnetic circuit inter- linked with two electric circuits or sets of circuits, the primary and the secondary. It therefore is electromagnetically the same structure as the transformer. The difference is, that in the transformer secondary and primary are stationary, and the electromagnetic induction between the circuits utilized to trans- mit electric power to the secondary, while in the induction motor the secondary is movable with regards to the primary, and the mechanical forces between the primary, and secondary utilized to produce motion. In the general alternating-current trans- former or frequency converter we shall find an apparatus trans- mitting electric as well as mechanical energy, and comprising both, induction motor and transformer, as the two limiting cases. In the induction motor, only the mechanicalSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”... ING-CURRENT PHENOMENA if I' I = secondary current per circuit, Ii = -J- = secondary current per circuit reduced to primary system ; if r'l = secondary resistance per circuit, Vi = a-hr'i = secondary resistance per circuit reduced to pri- mary system; if x'l = secondary reactance per circuit, Xi = a^bx'i = secondary reactance per circuit reduced to pri- mary system; if z'l = secondary impedance per circuit, 2i = a^hz'i = secondary impedance per circuit reduced to pri- mary system; that is, the number of secondary circuits and of turns per sec- ...Magnetism
Section titled “Magnetism”CHAPTER XVIII POLYPHASE INDUCTION MOTORS 155. The induction motor consists of a magnetic circuit inter- linked with two electric circuits or sets of circuits, the primary and the secondary. It therefore is electromagnetically the same structure as the transformer. The difference is, that in the transformer secondary and primary are stationary, and the electroma ...Radiation / light
Section titled “Radiation / light”... zed to trans- mit electric power to the secondary, while in the induction motor the secondary is movable with regards to the primary, and the mechanical forces between the primary, and secondary utilized to produce motion. In the general alternating-current trans- former or frequency converter we shall find an apparatus trans- mitting electric as well as mechanical energy, and comprising both, induction motor and transformer, as the two limiting cases. In the induction motor, only the mechanical force be- tween primary and secondary is used, but not the ...Alternating current
Section titled “Alternating current”... c induction between the circuits utilized to trans- mit electric power to the secondary, while in the induction motor the secondary is movable with regards to the primary, and the mechanical forces between the primary, and secondary utilized to produce motion. In the general alternating-current trans- former or frequency converter we shall find an apparatus trans- mitting electric as well as mechanical energy, and comprising both, induction motor and transformer, as the two limiting cases. In the induction motor, only the mechanical force be- tween primary and sec ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 19 | seeded |
| Ether | 2 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| counter e.m.f. | 5 | source-located candidate |
| ether | 2 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
| No chapter-local candidates yet | - | - |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-alternating-current-phenomena-fig-118 | is the angle of secondary lag. Fig. 118. The secondary m.m.f., OGi, is in the direction of the vector, | line 18102 |
theory-calculation-alternating-current-phenomena-fig-119 | determined thus, Fig. 119. Let | line 18133 |
theory-calculation-alternating-current-phenomena-fig-120 | AMPERES Fig. 120. 90 | line 19057 |
theory-calculation-alternating-current-phenomena-fig-121 | AMPERES Fig. 121. 250 | line 19500 |
theory-calculation-alternating-current-phenomena-fig-122 | . Fig. 122. On the same figure is shown the current per line, in dotted lines, with the verticals or torque as abscissas, and the hori- | line 19753 |
theory-calculation-alternating-current-phenomena-fig-123 | DO Fig. 123. hence, the efficiency is, Pi_ ^ ai (1 - s) | line 20132 |
theory-calculation-alternating-current-phenomena-fig-124 | 0 Fig. 124. and the apparent torque efficiency,^ | line 20407 |
Hidden-Gem Quote Candidates
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| No chapter-local candidates yet | - | - |
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.
- 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.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- 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.
Promotion Checklist
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- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
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- Keep Steinmetz wording, modern translation, and ether-field interpretation in separate labeled layers.