Apparatus Subsection 42: Direct-current Commutating Machines: C. Commutating Machines
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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-42 |
| Location | lines 10586-10645 |
| Status | candidate |
| Word Count | 375 |
| 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 171 All these windings are closed-circuit windings; that is, starting at any point, and following the armature conductor, the circuit returns into itself after passing all e.m.fs. twice in opposite direc- tion (thereby avoiding short circuit). An instance of an open- coil winding is shown in Fig. 84, a series-connected three-phase star winding similar to that used in the Thomson-Houston arc machine. Such open-coil windings, however, cannot be used in commutating machines. They are generally preferred in syn- chronous and in induction machines. FIG. 84. — Open-circuit three-phase series drum winding. 38. By leaving space between adjacent coils of these windings a second winding can be laid in between. The second winding can either be entirely independent from the first winding, that is, each of the two windings closed upon itself,Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Waves / transmission lines
Section titled “Waves / transmission lines”... t generation with synchronous converters usu- ally preferred, and as multiple spiral or reentrant windings are inconvenient in synchronous converters, their use has greatly decreased. 39. A distinction is frequently made between lap winding and wave winding. These are, however, not different types; but the wave winding is merely a constructive modification of the series drum winding with single-turn coil, as seen by comparingAlternating current
Section titled “Alternating current”D. C. COMMUTATING MACHINES 171 All these windings are closed-circuit windings; that is, starting at any point, and following the armature conductor, the circuit returns into itself after passing all e.m.fs. twice in opposite direc- tion (thereby avoiding short cir ...Chapter-Local Concept Hits
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
- 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”- Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
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