Chapter 15: Induction Motob
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Alternating Current Phenomena |
| Year | 1897 |
| Section ID | theory-calculation-alternating-current-phenomena-1897-chapter-15 |
| Location | lines 14919-17024 |
| Status | candidate |
| Word Count | 4895 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XV. INDUCTION MOTOB. 140. A specialization of the general alternating-current transformer is the induction motor. It differs from the sta- tionary alternating-current transformer in so far as the two sets of electric circuits — the primary or excited, and the secondary or induced, circuits — are movable with regard to each other ; and that in general a number of primary and a number of secondary circuits are used, angularly displaced around the periphery of the motor, and containing E.M.Fs. displaced in phase by the same angle. This multi-circuit arrangement has the object always to retain secondary cir- cuits in inductive relation to primary circuits, in spite of their relative motion. The result of the relative motion between primary and secondary is, that the E.M.Fs. induced in the secondary or the motor armature areSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”... o primary system ; if Ii = secondary current per circuit, /^ = _L a = secondary current per circuit reduced to primary system ; if r/ = secondary resistance per circuit, r, = a^ r^ = secondary resistance per circuit reduced to pri- mary system ; if Xx =- secondary reactance per circuit, Xi = a^ Xi^ = secondary reactance per circuit reduced to pri- mary system ; I 142] INDUCTION MOTOR. 209 if 0/ = secondary impedance per circuit, z^ = a^ z^ = secondary impedance per circuit reduced to pri- mary system ; that is, the number of secondary ...Magnetism
Section titled “Magnetism”... n the following discussion, as secondary quantities ex- clusively, the values reduced to the primary system shall be used, so that, to derive the true secondary values, these quantities have* to be reduced backwards again by the factor np «iA 142. Let * = total maximum flux of the magnetic field per motor pole. It is then E = V2ir«iV*10"® = effective E.M.F. induced by the mag- netic field per primary circuit. Counting the time from the moment where the rising magnetic flux of mutual induction * (flux interlinked with both electric circuits ...Complex quantities
Section titled “Complex quantities”... able with regard to each other ; and that in general a number of primary and a number of secondary circuits are used, angularly displaced around the periphery of the motor, and containing E.M.Fs. displaced in phase by the same angle. This multi-circuit arrangement has the object always to retain secondary cir- cuits in inductive relation to primary circuits, in spite of their relative motion. The result of the relative motion between primary and secondary is, that the E.M.Fs. induced in the secondary or the motor armature are not of the same freq ...Radiation / light
Section titled “Radiation / light”... bject always to retain secondary cir- cuits in inductive relation to primary circuits, in spite of their relative motion. The result of the relative motion between primary and secondary is, that the E.M.Fs. induced in the secondary or the motor armature are not of the same frequency as the E.M.F. impressed upon the primary, but of a frequency which is the difference between the impressed frequency and the frequency of rotation, or equal to the ** slip," that is, the difference between synchronism and speed (in cycles). Hence, if N = frequency of ma ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 16 | seeded |
| Ether | 2 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
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| ether | 2 | seeded |
Equation Candidates
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| No chapter-local candidates yet | - | - |
Figure Candidates
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Hidden-Gem Quote Candidates
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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.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Complex quantities: Track how Steinmetz preserves geometric rotation and quadrature while translating the same operation into symbolic form.
- 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.
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
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
- Verify the chapter boundary and surrounding context.
- Promote exact quotations only after checking the source image.
- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
- Move diagram candidates into the diagram archive only after image extraction, crop verification, and manifest creation.
- Keep Steinmetz wording, modern translation, and ether-field interpretation in separate labeled layers.