Apparatus Subsection 57: 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-57 |
| Location | lines 11401-11540 |
| Status | candidate |
| Word Count | 507 |
| 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 191 ture in centimeters per second, lp = pitch of armature slot (that is, width of one slot and one tooth at armature surface), the S frequency is /i = y-. Or, if / = frequency of machine, n — number of armature slots per pair of poles, /i = nf. For instance,/ = 33.3, n = 51, thus/i = 1700. Under the assumption, width of slots equals width of teeth = 2 X width of air gap, the dis- tribution of magnetic flux at the pole face is plotted in Fig. 103. The drop of density opposite each slot consists of two curved branches equal to those in Fig. 92, that is, calculated by •B' -3 n FIG. 103.— I < « i slots on flu Iffect of B distribution.Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Magnetism
Section titled “Magnetism”... requency of machine, n — number of armature slots per pair of poles, /i = nf. For instance,/ = 33.3, n = 51, thus/i = 1700. Under the assumption, width of slots equals width of teeth = 2 X width of air gap, the dis- tribution of magnetic flux at the pole face is plotted in Fig. 103. The drop of density opposite each slot consists of two curved branches equal to those in Fig. 92, that is, calculated by •B' -3 n FIG. 103.— I < « i slots on flu Iffect of B ...Field language
Section titled “Field language”... 103.— I < « i slots on flu Iffect of B distribution. V + 1*2 The average flux is 7525; that is, by cutting half the armature surface away by slots of a width equal to twice the length of air gap, the total flux under the field pole is reduced only in the proportion 8000 to 7525, or about 6 per cent. The flux B pulsating between 8000 and 5700 is equivalent to a uniform flux B\ = 7525 superposed with an alternating flux FIG. 104. — Effect of slots on flux d ...Radiation / light
Section titled “Radiation / light”D. C. COMMUTATING MACHINES 191 ture in centimeters per second, lp = pitch of armature slot (that is, width of one slot and one tooth at armature surface), the S frequency is /i = y-. Or, if / = frequency of machine, n — number of armature slots per pair of poles, /i = nf. For instance,/ = 33.3, n = 51, thus/i = 1700. Under the assumption, width of slots equals width of teeth = 2 X width of ...Waves / transmission lines
Section titled “Waves / transmission lines”... rnating flux FIG. 104. — Effect of slots on flux distribution. BO, shown in Fig. 104, with a maximum of 475 and a minimum of 1825. This alternating flux BQ can, as regards production of eddy currents, be replaced by the equivalent sine wave B0o, that is, a sine wave having the same effective value (or square root of mean square). The effective value is 718. The pulsation of magnetic flux farther in the interior of the field-pole face can be approximated by drawing curves e ...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.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Field language: Field-pressure or field-gradient interpretations can be explored here only after the explicit source passage and modern engineering translation are kept distinct.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- 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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