Apparatus Section 12: Direct-current Commutating Machines: Efficiency and Losses
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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-64 |
| Location | lines 11864-11904 |
| Status | candidate |
| Word Count | 228 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”XII. Efficiency and Losses 61. The losses in a commutating machine which have to be considered when deriving the efficiency by adding the individual losses are: 1. Loss in the resistance of the armature, the commutator leads, brush contacts and brushes, in the shunt field and the series field with their rheostats. 2. Hysteresis and eddy currents in the iron at a voltage equal to the terminal voltage, plus resistance drop in a generator, or minus resistance drop in a motor. 3. Eddy currents in the armature conductors when large and not protected, and in pole faces when solid and the air gap is small. 4. Friction of bearings, of brushes on the commutator, and windage. 5. Load losses, due to the increase of hysteresis and of eddy currents under load, caused by the changeSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”... 1. The losses in a commutating machine which have to be considered when deriving the efficiency by adding the individual losses are: 1. Loss in the resistance of the armature, the commutator leads, brush contacts and brushes, in the shunt field and the series field with their rheostats. 2. Hysteresis and eddy currents in the iron at a voltage equal to the terminal voltage, plus resistance drop in a generator, or minus resistance drop in a motor. 3. Eddy currents in the armatu ...Hysteresis
Section titled “Hysteresis”... be considered when deriving the efficiency by adding the individual losses are: 1. Loss in the resistance of the armature, the commutator leads, brush contacts and brushes, in the shunt field and the series field with their rheostats. 2. Hysteresis and eddy currents in the iron at a voltage equal to the terminal voltage, plus resistance drop in a generator, or minus resistance drop in a motor. 3. Eddy currents in the armature conductors when large and not protected, and in pole f ...Magnetism
Section titled “Magnetism”... and in pole faces when solid and the air gap is small. 4. Friction of bearings, of brushes on the commutator, and windage. 5. Load losses, due to the increase of hysteresis and of eddy currents under load, caused by the change of the magnetic dis- tribution, as local increase of magnetic density and of stray field. The friction of the brushes and the loss in the contact resist- ance of the brushes are frequently quite considerable, especially with low-voltage machines. Constant o ...Chapter-Local Concept Hits
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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.
- Hysteresis: Compare the passage with modern magnetic loss, B-H loop area, lag, material memory, and empirical loss laws.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
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.
- Hysteresis: An interpretive reading can treat hysteresis as field lag or memory, but the historical claim must remain Steinmetz’s actual magnetic-loss treatment.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
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