May 2008
Intermediate to advanced
340 pages
9h 41m
English
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C.2 THE PRIMITIVE SYNCHRONOUS MACHINE
In Chapter 1 (Section 1.3.3 (Balanced Three-phase Systems)) the rotating magnetic field was introduced. In the three-phase coil system, the resulting magnetic field vector rotates with a constant amplitude (see Figure 1.9).
A synchronous generator generates electricity, as we call it, by conversion of mechanical energy into electric energy. The two basic parts of the synchronous machine are the rotor and the armature or stator. The iron rotor is equipped with a DC-excited winding which acts as an electromagnet. When the rotor rotates and the rotor winding is excited, a rotating magnetic field is present in the air-gap between the rotor and the armature. The armature has a three-phase winding in which the time-varying EMF is generated by the rotating magnetic field. A simple synchronous machine is shown in Figure C.1. The machine has a cylindrical rotor with two poles which are excited with a DC current. In the armature the winding consists of one single turn. The cross-section of this machine is shown in Figure C.2.
Figure C.1 Three-dimensional view of a simple synchronous machine.
Figure C.2 Cross section of a simple synchronous machine and the field lines of the magnetic flux in the case that only the rotor current is present.
The rotor current ...
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