Apparatus Subsection 79: Direct-current Commutating Machines: C. Commutating Machines 219
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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-79 |
| Location | lines 13019-13119 |
| Status | candidate |
| Word Count | 790 |
| 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 219 In the alternating-current commutator motor, the field struc- ture as well as the armature must be laminated, since the mag- netic flux is alternating. The alternation of the field flux induces an e.m.f. of self induction in the field winding. In the shunt motor, this causes the field exciting current and with it the magnetic field flux to lag and thereby to be out of phase with the armature current which, to represent work, must essentially be an energy current, and thereby reduces output and efficiency and hence requires some method of compensation, as capacity in series with the field winding or excitation of the field from a quadrature phase of voltage. In the series motor the self-inductance of the field causes the main current to lag behind the impressedSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”D. C. COMMUTATING MACHINES 219 In the alternating-current commutator motor, the field struc- ture as well as the armature must be laminated, since the mag- netic flux is alternating. The alternation of the field flux induces an e.m.f. of self induction in the field winding. In the shunt motor, this causes the field excitin ...Magnetism
Section titled “Magnetism”D. C. COMMUTATING MACHINES 219 In the alternating-current commutator motor, the field struc- ture as well as the armature must be laminated, since the mag- netic flux is alternating. The alternation of the field flux induces an e.m.f. of self induction in the field winding. In the shunt motor, this causes the field exciting current and with it the magnetic field flux to lag and thereby to be out of ...Alternating current
Section titled “Alternating current”D. C. COMMUTATING MACHINES 219 In the alternating-current commutator motor, the field struc- ture as well as the armature must be laminated, since the mag- netic flux is alternating. The alternation of the field flux induces an e.m.f. of self induction in the fie ...Dielectricity / capacity
Section titled “Dielectricity / capacity”... gnetic field flux to lag and thereby to be out of phase with the armature current which, to represent work, must essentially be an energy current, and thereby reduces output and efficiency and hence requires some method of compensation, as capacity in series with the field winding or excitation of the field from a quadrature phase of voltage. In the series motor the self-inductance of the field causes the main current to lag behind the impressed voltage and thereby lowers the power- ...Chapter-Local Concept Hits
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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.
- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
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