Chapter 20: Commutator Motors
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Alternating Current Phenomena |
| Year | 1900 |
| Section ID | theory-calculation-alternating-current-phenomena-1900-chapter-20 |
| Location | lines 19458-20501 |
| Status | candidate |
| Word Count | 2640 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 4 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XX. COMMUTATOR MOTORS. 213. Commutator motors — that is, motors in which the current enters or leaves the armature over brushes through a segmental commutator — have been built of various types, but have not found any extensive appli- cation, in consequence of the superiority of the induction and synchronous motors, due to the absence of commu- tators. The main subdivisions of commutator motcrs are the repulsion motor, the series motor, and the shunt motor. REPULSION MOTOR. 214. The repulsion motor -is an induction motor or transformer motor ; that is, a motor in which the main current enters the primary member or field only, while in the secondary member, or armature, a current is in- duced, arid thus the action is due to the repulsive thrust between induced current and inducing magnetism. AsSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”... rs. The main subdivisions of commutator motcrs are the repulsion motor, the series motor, and the shunt motor. REPULSION MOTOR. 214. The repulsion motor -is an induction motor or transformer motor ; that is, a motor in which the main current enters the primary member or field only, while in the secondary member, or armature, a current is in- duced, arid thus the action is due to the repulsive thrust between induced current and inducing magnetism. As stated under the heading of induction motors, a multiple circuit armature is required for the pu ...Magnetism
Section titled “Magnetism”... tion motor or transformer motor ; that is, a motor in which the main current enters the primary member or field only, while in the secondary member, or armature, a current is in- duced, arid thus the action is due to the repulsive thrust between induced current and inducing magnetism. As stated under the heading of induction motors, a multiple circuit armature is required for the purpose of having always secondary circuits in inductive relation to the primary circuit during the rotation. If with a single- coil field, these secondary circuits are consta ...Impedance / reactance
Section titled “Impedance / reactance”... what is theoretically the same, when moving out of this position, is replaced by other secondary circuits entering this position of 45° displacement. For simplicity, in the following all the secondary quan- COMMUTATOR MOTORS. 359 titles, as E.M.F., current, resistance, reactance, etc., are assumed as reduced to the primary circuit by the ratio of turns, in the same way as done in the chapter on Induction Motors. 217. Let $ = maximum magnetic flux per field pole ; e = effective E.M.F. induced thereby in the field turns ; thus, where ;/ = numb ...Alternating current
Section titled “Alternating current”... the shunt motor. REPULSION MOTOR. 214. The repulsion motor -is an induction motor or transformer motor ; that is, a motor in which the main current enters the primary member or field only, while in the secondary member, or armature, a current is in- duced, arid thus the action is due to the repulsive thrust between induced current and inducing magnetism. As stated under the heading of induction motors, a multiple circuit armature is required for the purpose of having always secondary circuits in inductive relation to the primary circuit during ...Chapter-Local Concept Hits
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Chapter-Local Glossary 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 |
|---|---|---|
theory-calculation-alternating-current-phenomena-1900-fig-157 | the motor consists of a primary electric circuit, inducing Fig. 157. in the armature the secondary currents, and a primary magnetizing circuit producing the magnetism to act upon | line 19509 |
theory-calculation-alternating-current-phenomena-1900-fig-158 | ance, only in that position where the induced currents give Fig. 158. a rotary effort in the desired direction, while the armature coils are open-circuited in the position where… | line 19536 |
theory-calculation-alternating-current-phenomena-1900-fig-159 | the direction of the magnetic field, short-circuit either a Fig. 159. part of the armature coils as shown in Fig. 158, or the whole armature by a connection from brush to brush as | line 19563 |
theory-calculation-alternating-current-phenomena-1900-fig-160 | and a secondary circuit closed upon itself and displaced in Fig. 160. space by 45° — in a bipolar motor — from the direction of the magnetic flux, as shown diagrammatically in F… | line 19590 |
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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.
- Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
- 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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- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
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