Apparatus Section 8: Synchronous Machines: Characteristic Curves of Synchronous Motor
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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-29 |
| Location | lines 9399-9553 |
| Status | candidate |
| Word Count | 595 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”VIII. Characteristic Curves of Synchronous Motor 17. In Fig. 66 are shown, at constant impressed e.m.f. E, the nominal counter-generated e.m.f. EQ and thus the field excitation FQ required, 1. At no phase displacement, 6 = 0, or for the condition of minimum input; 144 ELEMENTS OF ELECTRICAL ENGINEERING 2. For 0 = + 60, or 60 deg. lag: p = 0.5, q = + 0.866, and 3. For 0 = - 60, or 60 deg. lead: p = 0.5, q = - 0.866, with the current I as abscissas, the constants being r = 0.1, z0 = 5, and E = 1000. These curves are called the compounding curves of the syn- chronous motors. In Fig. 67 are shown, with the power output PI = i (Ep — ir) — (iron loss and friction)Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Field language
Section titled “Field language”VIII. Characteristic Curves of Synchronous Motor 17. In Fig. 66 are shown, at constant impressed e.m.f. E, the nominal counter-generated e.m.f. EQ and thus the field excitation FQ required, 1. At no phase displacement, 6 = 0, or for the condition of minimum input; 144 ELEMENTS OF ELECTRICAL ENGINEERING 2. For 0 = + 60, or 60 deg. lag: p = 0.5, q = + 0.866, and 3. For 0 = - 60, or 60 ...Dielectricity / capacity
Section titled “Dielectricity / capacity”VIII. Characteristic Curves of Synchronous Motor 17. In Fig. 66 are shown, at constant impressed e.m.f. E, the nominal counter-generated e.m.f. EQ and thus the field excitation FQ required, 1. At no phase displacement, 6 = 0, or for the condition of minimum input; 144 ELEMENTS OF ELECTRICAL ENGINEERING 2. For 0 = + 60, or 60 deg. lag: p = 0.5, q = + 0.866, and 3. For 0 = - 60, or 60 deg. lead: p = 0.5, q = - 0.866, with the current ...Radiation / light
Section titled “Radiation / light”... e stability, that is, independence of minor fluctuations of impressed voltage or of field excitation. 19. The theoretical maximum output of the synchronous motor, or the load at which it drops out of step, at constant impressed voltage and frequency is, even with very high armature reaction, usually far beyond the heating limits of the machine. 200 100 600 800 1000 1200 UOO 1600 1800 2000 FIG. 66. — Synchronous motor phase characteristics. The actual maximum outpu ...Impedance / reactance
Section titled “Impedance / reactance”... on each of the four-phase characteristics a certain field excitation gives 146 ELEMENTS OF ELECTRICAL ENGINEERING minimum current, a lesser excitation gives lagging current, a greater excitation leading current. The higher the synchronous reactance XQ, and thus the armature reaction of the synchronous motor, the flatter are the phase characteristics; that is, the less sensitive is the synchronous motor for a change of field excitation or of impressed e.m.f. Thus a relatively high arm ...Chapter-Local Concept Hits
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