Chapter 20: Single-Phase Commutator Motors
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Electric Apparatus |
| Year | 1917 |
| Section ID | theory-calculation-electric-apparatus-chapter-18 |
| Location | lines 23906-30087 |
| Status | candidate |
| Word Count | 23780 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 5 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XX SINGLE-PHASE COMMUTATOR MOTORS I. General 189. Alternating-current commutating machines have so far become ef industrial importance mainly as motors of the series or varying-speed type, for single-phase railroading, and as con- stant-speed motors or adjustable-speed motors, where efficient acceleration under heavy torque is necessary. As generators, they would be of advantage for the generation of very low fre- quency, since in this case synchronous machines are uneconom- ical, due to their very low speed, resultant from the low frequency. The direction of rotation of a direct-current motor, whether shunt or series motor, remains the same at a reversal of the im- pressed e.m.f., as in this case the current in the armature circuit and the current in the field circuit and so the field magnetism both reverse. Theoretically, a direct-current motor therefore couldSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”... o their very low speed, resultant from the low frequency. The direction of rotation of a direct-current motor, whether shunt or series motor, remains the same at a reversal of the im- pressed e.m.f., as in this case the current in the armature circuit and the current in the field circuit and so the field magnetism both reverse. Theoretically, a direct-current motor therefore could be operated on an alternating impressed e.m.f. provided that the magnetic circuit of the motor is laminated, so as to fol- low the alternations of magnetism without serious ...Magnetism
Section titled “Magnetism”... nt from the low frequency. The direction of rotation of a direct-current motor, whether shunt or series motor, remains the same at a reversal of the im- pressed e.m.f., as in this case the current in the armature circuit and the current in the field circuit and so the field magnetism both reverse. Theoretically, a direct-current motor therefore could be operated on an alternating impressed e.m.f. provided that the magnetic circuit of the motor is laminated, so as to fol- low the alternations of magnetism without serious loss of power, and that precautio ...Impedance / reactance
Section titled “Impedance / reactance”... he inductivity of the secondary circuit, as shown by the transformer diagram, Fig. 166. Herefrom it follows that: In the inductively compensated series motor, 2, the quad- rature flux is very small and practically negligible, as very little voltage is consumed in the low impedance of the secondary cir- cuit, C; whatever flux there is, lags behind the main flux. 346 ELECTRICAL APPARATUS In the inductively compensated series ipotor with secondary excitation, or inverted repulsion motor, 3, the quadrature flux, $1, is quite large, as a considerab ...Complex quantities
Section titled “Complex quantities”CHAPTER XX SINGLE-PHASE COMMUTATOR MOTORS I. General 189. Alternating-current commutating machines have so far become ef industrial importance mainly as motors of the series or varying-speed type, for single-phase railroading, and as con- stant-speed motors or adjustable-speed motors, where efficient acceleration under heavy torque is necessary. As generators, they would be of advantage for the generation of very low fre- quency, since in this case synchronous machines are uneconom- ical, due to their very low speed, resultant from the ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
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| Frequency | 30 | seeded |
| Ether | 7 | seeded |
| Light | 4 | seeded |
Chapter-Local Glossary Hits
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| ether | 7 | seeded |
Equation Candidates
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Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-electric-apparatus-fig-166 | is less than 90” liehind the primary current, more than 90° ahead of the secondary current, the more so the higher is the inductivity of the secondary circuit, as shown by the t… | line 24697 |
theory-calculation-electric-apparatus-fig-186 | c = c2#2; co#> + #1 = 0; lo = co/i; It = 0. Fig. 186. 7. Series repulsion motor with secondary excitation : | line 26791 |
theory-calculation-electric-apparatus-fig-187 | /m Fig. 187. 10. Rotor-excited series motor with conductive compensation : | line 26816 |
theory-calculation-electric-apparatus-fig-188 | brush short-circuit c* = 0.04; that is, the same constants as used in the repulsion motor, Fig. 188. Curves are plotted for the voltage ratios; t = 0: inductively compensated se… | line 29224 |
theory-calculation-electric-apparatus-fig-192 | t = 0.2: series repulsion motor, high-speed, Fig. 190. ( = 0.5: series repulsion motor, medium-speed, Fig. 191. ( = 1.0: repulsion motor with secondary excitation, low-speed, Fi… | line 29231 |
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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.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- 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.
Ether-Field Interpretive Boundary
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