Lecture 9: Hunting Of Synchronous Machines
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | General Lectures on Electrical Engineering |
| Year | 1908 |
| Section ID | general-lectures-electrical-engineering-lecture-09 |
| Location | lines 4218-4594 |
| Status | candidate |
| Word Count | 2455 |
| Equation Candidates In Section | 3 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”NINTH LECTURE HUNTING OF SYNCHRONOUS MACHINES C"^ROSS currents can flow between alternators due to dif- ferences in voltage, that is, differences in excitation; ■—^ and due to differences in phase, that is, differences in position of their rotors. Cross currents due to differences in excitation are watt- less currents, magnetizing the under-excited and demagnetiz- ing the over-excited machine. Cross currents due to differences in position are energy currents, accelerating the lagging and retarding the leading machine. Their magnetic action is a distortion or a shift of the field, ithat is, they increase the magnetic density at the one and decrease it at the other pole corner. If two machines are thrown together out of phase, or brought out of the phase by some cause (as the beat of an en- gine, or the change ofSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Radiation / light
Section titled “Radiation / light”... reases and dies out, and the machines run steadily. If the oscillations do not decrease, but continue, the machines are said to be hunting. If the oscillation is small it may do no harm ; if it is greater, it may cause fluctuation of voltage, resulting in flick- ering of lights, etc. ; if it gets very large, it may throw the ma- chines out of step. Some causes of hunting are: 1st. Magnetic lag. 2nd. Pulsation of engine speed. 3rd. Hunting of engine governors. 4th. Wrong speed characteristic of engine. ii6 GENERAL LECTURES I St. When th ...Ether references
Section titled “Ether references”... n are energy currents, accelerating the lagging and retarding the leading machine. Their magnetic action is a distortion or a shift of the field, ithat is, they increase the magnetic density at the one and decrease it at the other pole corner. If two machines are thrown together out of phase, or brought out of the phase by some cause (as the beat of an en- gine, or the change of load of a synchronous motor) then the two machines pull each other in phase again, oscillate a few times against each other, which oscillation gradually decreases and dies ...Field language
Section titled “Field language”... less currents, magnetizing the under-excited and demagnetiz- ing the over-excited machine. Cross currents due to differences in position are energy currents, accelerating the lagging and retarding the leading machine. Their magnetic action is a distortion or a shift of the field, ithat is, they increase the magnetic density at the one and decrease it at the other pole corner. If two machines are thrown together out of phase, or brought out of the phase by some cause (as the beat of an en- gine, or the change of load of a synchronous motor) then the ...Magnetism
Section titled “Magnetism”... rrents due to differences in excitation are watt- less currents, magnetizing the under-excited and demagnetiz- ing the over-excited machine. Cross currents due to differences in position are energy currents, accelerating the lagging and retarding the leading machine. Their magnetic action is a distortion or a shift of the field, ithat is, they increase the magnetic density at the one and decrease it at the other pole corner. If two machines are thrown together out of phase, or brought out of the phase by some cause (as the beat of an en- gine, or the ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 22 | seeded |
| Ether | 19 | seeded |
| Light | 8 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| ether | 19 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
general-lectures-electrical-engineering-eq-candidate-0083 | Instance : 80 beats per minute, 10 intermissions per | line 4459 |
general-lectures-electrical-engineering-eq-candidate-0084 | instance, a generator may make 75 revolutions per minute, | line 4469 |
general-lectures-electrical-engineering-eq-candidate-0085 | to hunting so that if the resistance drop is more than 10% to | line 4573 |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
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| No chapter-local candidates yet | - | - |
Hidden-Gem Quote Candidates
Section titled “Hidden-Gem Quote Candidates”| Candidate ID | Candidate Passage | Source Location |
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| No chapter-local candidates yet | - | - |
Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Ether references: Verify exact wording before drawing conclusions. Ether language must be separated from later interpretive systems.
- 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.
- Transients / damping: Separate the temporary term from the final steady-state term and compare with differential-equation response language.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- Ether references: If Steinmetz mentions ether, quote only the verified source words first; any broader ether-field synthesis belongs in a labeled interpretive layer.
- 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.
- Transients / damping: Transient collapse, impulse, and surge behavior can be compared with alternative field language, but only as a clearly marked reading.
Promotion Checklist
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
- Verify the chapter boundary and surrounding context.
- Promote exact quotations only after checking the source image.
- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
- Move diagram candidates into the diagram archive only after image extraction, crop verification, and manifest creation.
- Keep Steinmetz wording, modern translation, and ether-field interpretation in separate labeled layers.