Apparatus Subsection 44: Direct-current Commutating Machines: C. Commutating Machines 175
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theoretical Elements of Electrical Engineering |
| Year | 1915 |
| Section ID | theoretical-elements-electrical-engineering-section-44 |
| Location | lines 10685-10736 |
| Status | candidate |
| Word Count | 357 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”D. C. COMMUTATING MACHINES 175 sarily be lap or coil windings. In Fig. 90 is shown a series drum winding with 35 coils and commutator segments, and a single turn per coil arranged as wave winding. This winding may be compared with the 35-coil series drum winding in Fig. 83. 40. Drum winding can be divided into full-pitch and frac- tional-pitch windings. In the full-pitch winding the spread of the coil covers the pitch of one pole; that is, each coil covers FIG. 90. — Series drum wave winding. one-sixth of the armature circumference in a six-pole machine, etc. In a fractional-pitch winding it covers less or more. Series drum windings without cross-connected commutator in which thus the number of coils is not divisible by the number of poles are necessarily always slightly fractional pitch;Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Magnetism
Section titled “Magnetism”... Fractional-pitch windings have the advantage of shorter end connections and less self-inductance in commutation, since commutation of corresponding coils under different poles does not take place in the same, but in different, slots, and the flux of self-inductance in commutation is thus more subdivided. Fig. 91 shows the multiple drum winding of Fig. 81 as a frac- FIG. 91. — Multiple drum five-sixth fractional pitch winding. tional-pitch winding with five teeth spread, or five-sixt ...Waves / transmission lines
Section titled “Waves / transmission lines”D. C. COMMUTATING MACHINES 175 sarily be lap or coil windings. In Fig. 90 is shown a series drum winding with 35 coils and commutator segments, and a single turn per coil arranged as wave winding. This winding may be compared with the 35-coil series drum winding in Fig. 83. 40. Drum winding can be divided into full-pitch and frac- tional-pitch windings. In the full-pitch winding the spread of the coil covers the pitch of o ...Radiation / light
Section titled “Radiation / light”... in a six-pole machine, etc. In a fractional-pitch winding it covers less or more. Series drum windings without cross-connected commutator in which thus the number of coils is not divisible by the number of poles are necessarily always slightly fractional pitch; but gen- erally the expression " fractional-pitch winding" is used only for windings in which the coil covers one or several teeth less than correspond to the pole pitch. Thus the multiple drum winding in Fig. 81 would b ...Chapter-Local Concept Hits
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
- 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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