Chapter 2: Multiple Squirrel-Cage Induction Motor
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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-02 |
| Location | lines 3543-5554 |
| Status | candidate |
| Word Count | 5213 |
| Equation Candidates In Section | 136 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER II MULTIPLE SQUIRREL-CAGE INDUCTION MOTOR 18. In an induction motor, a high-resistance low-reactance secondary is produced by the use of an external non-inductive resistance in the secondary, or in a motor with squirrel-cage secondary, by small bars of high-resistance material located clow* to the periphery of the rotor. Such a motor has a great slip of speed under load, therefore poor efficiency and poor speed regu- lation, but it has a high starting torque and torque at low and intermediate speed. With a low resistance fairly high-reactance secondary, the slip of speed under load is small, therefore effi- ciency and speed regulation good, but the starting torque arid torque at low and intermediate speeds is low, and the current in starting and at low speed is large. To combine good start- ing with goodSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”CHAPTER II MULTIPLE SQUIRREL-CAGE INDUCTION MOTOR 18. In an induction motor, a high-resistance low-reactance secondary is produced by the use of an external non-inductive resistance in the secondary, or in a motor with squirrel-cage secondary, by small bars of high-resistance material located clow* to the periphery of the rotor. Such a motor has a great slip of speed under load, t ...Magnetism
Section titled “Magnetism”... the first squirrel cage, and thus of higher reactance, a "double squirrel-cage induction motor" in derived, which to some extent combines the characteristics of the high- resistance and the low-resistance secondary. That is, at start- ing and low speed, the frequency of the magnetic flux in the arma- ture, and therefore the voltage induced in the secondary winding is high, and the high-resistance squirrel cage thus carries con- siderable current, gives good torque and torque efficiency, while the low-resistance squirrel cage is ineffective, due to its h ...Radiation / light
Section titled “Radiation / light”... hat is, inside of the first squirrel cage, and thus of higher reactance, a "double squirrel-cage induction motor" in derived, which to some extent combines the characteristics of the high- resistance and the low-resistance secondary. That is, at start- ing and low speed, the frequency of the magnetic flux in the arma- ture, and therefore the voltage induced in the secondary winding is high, and the high-resistance squirrel cage thus carries con- siderable current, gives good torque and torque efficiency, while the low-resistance squirrel cage is ineffecti ...Field language
Section titled “Field language”... hus receives the secondary current from the n-polar winding and acts as n'-polar primary to the short-circuited stator winding as secondary. This gives an n-polar motor concatenated to an n'-polar, and the magnetic structure simultaneously carries an n-polar and an n'-polar magnetic field. With this arrangement of "internal concatenation," it is essential to choose the number of poles, n and n', so that the two rotating fields do not interfere with each other, that is, the n'-polar field does not induce in the n-polar winding, nor the n-polar field in the n'- ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 30 | seeded |
| Ether | 5 | seeded |
| Light | 1 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
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| ether | 5 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-electric-apparatus-eq-candidate-0091 | 18. In an induction motor, a high-resistance low-reactance | line 3547 |
theory-calculation-electric-apparatus-eq-candidate-0092 | 19. In the calculation of the standard induction motor, it is | line 3620 |
theory-calculation-electric-apparatus-eq-candidate-0093 | $2 = true induced vpltage in inner squirrel cage, reduced | line 3664 |
theory-calculation-electric-apparatus-eq-candidate-0094 | Zi = r2 + jx2 = self-inductive impedance at full frequency, | line 3668 |
theory-calculation-electric-apparatus-eq-candidate-0095 | Z0 = r0 + jx0 = primary self -inductive impedance, and | line 3684 |
theory-calculation-electric-apparatus-eq-candidate-0096 | *8ee “Electric Circuits”, Chapter XII. Reactance of Induction | line 3687 |
theory-calculation-electric-apparatus-eq-candidate-0097 | E, = Et + jx, h- (4) | line 3721 |
theory-calculation-electric-apparatus-eq-candidate-0098 | E - E,+jx,Ut + h)- (5) | line 3723 |
Figure Candidates
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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”- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- 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.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Ether references: Verify exact wording before drawing conclusions. Ether language must be separated from later interpretive systems.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- 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.
- 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.
- Ether references: If Steinmetz mentions ether, quote only the verified source words first; any broader ether-field synthesis belongs in a labeled interpretive layer.
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.