Apparatus Section 12: Synchronous Machines: Starting of Synchronous Motors
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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-33 |
| Location | lines 9749-9820 |
| Status | candidate |
| Word Count | 541 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”XII. Starting of Synchronous Motors 24. In starting, an essential difference exists between the single- phase and the polyphase synchronous motor, in so far as the for- mer is not self-starting but has to be brought to complete syn- chronism, or in step with the generator, by external means before it can develop torque, while the polyphase synchronous motor starts from rest and runs up to synchronism with more or less torque. In starting, the field excitation of the polyphase synchronous motor should be zero or very low. The starting torque is due to the magnetic attraction of the armature currents upon the remanent magnetism left in the field poles by the currents of the preceding phase, and to the eddy currents produced therein. Let Fig. 72 represent the magnetic circuit of a polyphase synchronousSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”... brought to complete syn- chronism, or in step with the generator, by external means before it can develop torque, while the polyphase synchronous motor starts from rest and runs up to synchronism with more or less torque. In starting, the field excitation of the polyphase synchronous motor should be zero or very low. The starting torque is due to the magnetic attraction of the armature currents upon the remanent magnetism left in the field poles by the currents of the preceding ...Magnetism
Section titled “Magnetism”... ile the polyphase synchronous motor starts from rest and runs up to synchronism with more or less torque. In starting, the field excitation of the polyphase synchronous motor should be zero or very low. The starting torque is due to the magnetic attraction of the armature currents upon the remanent magnetism left in the field poles by the currents of the preceding phase, and to the eddy currents produced therein. Let Fig. 72 represent the magnetic circuit of a polyphase synchronou ...Hysteresis
Section titled “Hysteresis”... r impressed voltage the current is leading, with higher impressed voltage lagging, in a synchronous motor. 152 ELEMENTS OF ELECTRICAL ENGINEERING face of the field pole opposite to the armature projections lags behind the m.m.f., due to hysteresis and eddy currents, and thus is still remanent, while the m.m.f. of the projection 1 decreases, and is attracted by the rising m.m.f. of projection 2, etc., or, in other words, while the maximum m.m.f. in the armature has a position a, t ...Impedance / reactance
Section titled “Impedance / reactance”... the current lower than with solid field poles. In either case, at full impressed e.m.f. the starting current of a synchronous motor is large, since in the absence of a counter e.m.f. the total impressed e.m.f. has to be consumed by the impedance of the armature cir- cuit. Since the starting torque of the synchronous motor is due to the magnetic flux produced by the alternating armature cur- rents, or the armature reaction, synchronous motors of high armature reaction are superior in ...Chapter-Local Concept Hits
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| Magnetic permeability | 1 | seeded |
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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.
- Hysteresis: Compare the passage with modern magnetic loss, B-H loop area, lag, material memory, and empirical loss laws.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- 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.
- Hysteresis: An interpretive reading can treat hysteresis as field lag or memory, but the historical claim must remain Steinmetz’s actual magnetic-loss treatment.
Promotion Checklist
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