Apparatus Subsection 80: Direct-current Commutating Machines: C. Commutating Machines 221
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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-80 |
| Location | lines 13120-13188 |
| Status | candidate |
| Word Count | 544 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”D. C. COMMUTATING MACHINES 221 economy of high voltage alternating-current transmission and distribution. For railroading generally the series motor type is used, either the plain compensated series motor, or inductive modifications thereof, as the repulsion motor etc. In the repul- sion motor the armature, instead of being connected in series with field and compensating winding, is closed on itself and thus traversed by a secondary current induced by the compensating winding as primary that is, the armature is connected inductively in series. 2. As constant-speed motor where considerable starting torque is required, as for elevators, hoists, etc., and in general as self-starting single-phase motors. For this purpose, com- binations of repulsion and induction type or of series and in- duction type are used. 3. As adjustable speed, alternating-current motor of single- phase and of polyphaseSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”... r railroading generally the series motor type is used, either the plain compensated series motor, or inductive modifications thereof, as the repulsion motor etc. In the repul- sion motor the armature, instead of being connected in series with field and compensating winding, is closed on itself and thus traversed by a secondary current induced by the compensating winding as primary that is, the armature is connected inductively in series. 2. As constant-speed motor where conside ...Alternating current
Section titled “Alternating current”D. C. COMMUTATING MACHINES 221 economy of high voltage alternating-current transmission and distribution. For railroading generally the series motor type is used, either the plain compensated series motor, or inductive modifications thereof, as the repulsion motor etc. ...Magnetism
Section titled “Magnetism”... ither by introducing a leading current, as from condenser or overexcited synchronous motor, or by in- troducing a lagging voltage. In the commutating machines, the voltage induced in the armature by its rotation is in phase with the field magnetism, and by lagging the field exciting current, 222 ELEMENTS OF ELECTRICAL ENGINEERING the commutating machines thus can be made to give a lagging voltage, that is, to compensate for low power-factor due to lagging current. Thus, by insert ...Radiation / light
Section titled “Radiation / light”... and lowered, if this e.m.f. is in opposition; raised beyond synchronism, if this e.m.f. is in the same direction as the e.m.f. induced in the motor secondary. As, however, the e.m.f. induced in the induction motor secondary is of the frequency of slip, the speed controlling e.m.f. must either be supplied through the commutator or de- rived from a low frequency commutating machine as source. 4. For power-factor compensation. In an inductive circuit, the current lags behind the v ...Chapter-Local Concept Hits
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Modern Engineering Reading Prompts
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