Chapter 11: Instability Of Circuits: Induction And Syn Chronous Motors
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Electric Circuits |
| Year | 1917 |
| Section ID | theory-calculation-electric-circuits-chapter-11 |
| Location | lines 21382-22633 |
| Status | candidate |
| Word Count | 4324 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XI INSTABILITY OF CIRCUITS: INDUCTION AND SYN- CHRONOUS MOTORS C. Instability of Induction Motors 102. Instability of electric circuits may result from causes which are not electrical: thus, mechanical relations between the torque given by a motor and the torque required by its load, may lead to instability. Let D = torque given by a motor at speed, S, and D' = torque required by the load at speed, S. The motor, then, could theoretically operate, that is, run at constant speed, at that speed, S, where Z) = D' (1) However, at this speed and load, the operation may be stable, that is, the motor continue to run indefinitely at constant speed, or the condition may be unstable, that is, the speed change with increasing rapidity, until stability is reached at some otherSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Transients / damping
Section titled “Transients / damping”... = 10, the load torque is momentarily- increased. If this increase leaves D' lower than the maximum motor torque. Do = 14.3, the motor speed slows down, but re- mains above c, and thus when the increase of load is taken off, the motor again speeds up to a. If, however, the temporary increase of load torque exceeds the maximum motor torque. Do = 14.3 — ^for instance by starting a line of shafting or other mass of considerable momentimi — then the motor speed continues to drop as long as the excess load exists, and whether the motor will recover when the ...Magnetism
Section titled “Magnetism”... able condition or to stand- still, etc. Oscillatory instability in induction-motor circuits, as the result of the relation of load to speed and electric supply, is rare. It has been observed, especially in single-phase motors, in cases of considerable oversaturation of the magnetic circuit. Oscillatory instability, however, is typical of the synchronous machine, and the hunting of synchronous machines has probably been the first serious problem of cimiulative oscillations in electric circuits, and for a long time has limited the industrial use of syn- ...Radiation / light
Section titled “Radiation / light”... tor has dropped to point di in Fig. 102, its speed thus is still above 6, the motor recovers; if, however, its speed has dropped to d2, be- low the speed 6, >S = 0.35, at which the motor torque drops below the load torque, then the motor does not recover, but stops. With a lighter load torque, D'o, which is less than the starting torque, g, obviously the motor will always recover in speed The amount, by which the motor drops in speed at temporary overload, naturally depends on the duration of the overload, and on the momentum of the motor and its m ...Dielectricity / capacity
Section titled “Dielectricity / capacity”... e energy losses resulting from the oscillation of speed (hysteresis and eddies in the pole faces, currents in damper windings), that is, the damping power, assumed as proportional to the square of the speed. If there is no lag of the synchronizing force behind the position displacement, the synchronizing force, that is, the force which tends to bring the rotor back from a position behind or ahead of the position corresponding to the load, would be — or may ap- proximately be assumed as — proportional to the position dis- placement, p, but with reverse sign ...Chapter-Local Concept Hits
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Transients / damping: Separate the temporary term from the final steady-state term and compare with differential-equation response language.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
- 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”- Transients / damping: Transient collapse, impulse, and surge behavior can be compared with alternative field language, but only as a clearly marked reading.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- Dielectricity / capacity: A Wheeler-style reading may emphasize dielectric compression, field stress, and stored potential, but this page treats that as interpretation unless Steinmetz explicitly says it.
Promotion Checklist
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
- Verify the chapter boundary and surrounding context.
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- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
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