Chapter 19: Synchronous Motor
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Alternating Current Phenomena |
| Year | 1900 |
| Section ID | theory-calculation-alternating-current-phenomena-1900-chapter-19 |
| Location | lines 18053-19457 |
| Status | candidate |
| Word Count | 5681 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 15 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XIX. SYNCHRONOUS MOTOR. 198. In the chapter on synchronizing alternators we have seen that when an alternator running in synchronism is connected with a system of given E.M.F., the work done by the alternator can be either positive or negative. In the latter case the alternator consumes electrical, and consequently produces mechanical, power ; that is, runs as a synchronous motor, so that the investigation of the synchronous motor is already contained essentially in the equations of parallel-running alternators. Since in the foregoing we have made use mostly of the symbolic method, we may in the following, as an instance of the graphical method, treat the action of the synchronous motor diagrammatically. Let an alternator of the E.M.F., E±, be connected as synchronous motor with a supply circuit of E.M.F., EQ, by a circuitSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”... the symbolic method, we may in the following, as an instance of the graphical method, treat the action of the synchronous motor diagrammatically. Let an alternator of the E.M.F., E±, be connected as synchronous motor with a supply circuit of E.M.F., EQ, by a circuit of the impedance Z. If E0 is the E.M.F. impressed upon the motor termi- nals, Z is the impedance of the motor of induced E.M.F., E±. If E0 is the E.M.F. at the generator terminals, Z is the impedance of motor and line, including transformers and other intermediate apparatus. If EQ is the i ...Dielectricity / capacity
Section titled “Dielectricity / capacity”... or reduces, unloading increases, the current within the range between 1 and 12. The condition of maximum output is 3, current in phase with impressed E.M.F. Since at constant current the loss is constant, this is at the same time the condition of max- imum efficiency : no displacement of phase of the impressed SYNCHRONOUS MOTOR. 329 E.M.F., or self-induction of the circuit compensated by the effect of the lead of the motor current. This condition of maximum efficiency of a circuit we have found already in the Chapter on Inductance and Capacity. ...Alternating current
Section titled “Alternating current”... t the investigation of the synchronous motor is already contained essentially in the equations of parallel-running alternators. Since in the foregoing we have made use mostly of the symbolic method, we may in the following, as an instance of the graphical method, treat the action of the synchronous motor diagrammatically. Let an alternator of the E.M.F., E±, be connected as synchronous motor with a supply circuit of E.M.F., EQ, by a circuit of the impedance Z. If E0 is the E.M.F. impressed upon the motor termi- nals, Z is the impedance of the m ...Field language
Section titled “Field language”... impedance of the circuit of (equivalent) resistance r and (equivalent) reactance x = 2 TT NL, containing the impressed E.M.F. e0* and the counter E.M.F. et of the syn- chronous motor; that is, the E.M.F. induced in the motor arma- ture by its rotation through the (resultant) magnetic field. Let i = current in the circuit (effective values). The mechanical power delivered by the synchronous motor (including friction and core loss) is the electric power consumed by the C. E.M.F. e1; hence — p = *>! cos ft,^), (1) thus, — * If f0 = E.M.F. at motor termin ...Chapter-Local Concept Hits
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Chapter-Local Glossary Hits
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Equation Candidates
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Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
theory-calculation-alternating-current-phenomena-1900-fig-138 | eral, in one of these diagrams shown in Fig. 138 in drawn Fig. 138. lines, current and E.M.F. are in the same direction, repre- senting mechanical work done by the machine as mo… | line 18154 |
theory-calculation-alternating-current-phenomena-1900-fig-139 | sists of three components ; the E.M.F. OE£ — Ez, consumed Fig. 139. by the impedance of the motor, the E.M.F. consumed by the impedance of the line, and the E.M.F. | line 18187 |
theory-calculation-alternating-current-phenomena-1900-fig-140 | tor diagram in dotted line. Fig. 140. As seen, for small values of E1 the potential drops in the alternator and in the line. For the value of E1 = E0 | line 18219 |
theory-calculation-alternating-current-phenomena-1900-fig-747 | these quantities change with a change of the constants. Fig. 747. 201. A. — Constant impressed E.M.F. Ev, constant current strength I = i, variable motor excitation Ev (Fig. 142.) | line 18241 |
theory-calculation-alternating-current-phenomena-1900-fig-142 | etc., the power is / x 02^, I x 03^, etc., increases first, Fig. 142. reaches the maximum at the point 3j, 3, the most extreme point at the right, with the impressed E.M.F. in p… | line 18273 |
theory-calculation-alternating-current-phenomena-1900-fig-143 | and O as center. Fig. 143. E lies on a straight line e, passing throtigh the origin; | line 18345 |
theory-calculation-alternating-current-phenomena-1900-fig-144 | In the first case, El = EQ (Fig. 127), we see that at Fig. 144. very small current, that is very small OE, the current / | line 18368 |
theory-calculation-alternating-current-phenomena-1900-fig-145 | V Fig. 145. EI = EQ, but has a minimum value corresponding to the | line 18400 |
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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.
- 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.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Complex quantities: Track how Steinmetz preserves geometric rotation and quadrature while translating the same operation into symbolic form.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- 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.
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