Apparatus Subsection 77: 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-77 |
| Location | lines 12929-13007 |
| Status | candidate |
| Word Count | 463 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 1 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”D. C. COMMUTATING MACHINES 217 This speed curve corresponds to a constant position of brushes midway between the field poles, as generally used in railway motors and other series motors. If the brushes have a constant shift or are shifted proportionally to the load, instead of the saturation curve A in Fig. 121 a curve is to be used correspond- ing to the position of brushes, that is, derived by adding to the abscissas of A the values iq, the demagnetizing effect of arma- ture reaction. 10 60 FIG. 121 100 120 _110 160 ISO -Series motor speed curve. The torque of the series motor is shown also in Fig. 121, derived as proportional to A X i, that is, current X magnetic flux. Compound Motors 76. Compound motors can be built with cumulative com-Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”D. C. COMMUTATING MACHINES 217 This speed curve corresponds to a constant position of brushes midway between the field poles, as generally used in railway motors and other series motors. If the brushes have a constant shift or are shifted proportionally to the load, instead of the saturation curve A in Fig. 121 a curve is to be used correspond- ing to t ...Magnetism
Section titled “Magnetism”... magnetizing effect of arma- ture reaction. 10 60 FIG. 121 100 120 _110 160 ISO -Series motor speed curve. The torque of the series motor is shown also in Fig. 121, derived as proportional to A X i, that is, current X magnetic flux. Compound Motors 76. Compound motors can be built with cumulative com- pounding and with differential compounding. Cumulative compounding is used to a considerable extent, as in elevator motors, etc., to secure economy of current in st ...Alternating current
Section titled “Alternating current”D. C. COMMUTATING MACHINES 217 This speed curve corresponds to a constant position of brushes midway between the field poles, as generally used in railway motors and other series motors. If the brushes have a constant shift or are shifted proportionally to the ...Chapter-Local Concept Hits
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Equation Candidates
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Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
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theoretical-elements-electrical-engineering-fig-121 | 10 60 FIG. 121 100 120 _110 160 ISO | line 12947 |
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- 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”- 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.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
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