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SYNCHRONOUS MACHINES
11.2 CHAPTER ELEVEN
FIGURE 11.1 Cross section of a primitive two-pole salient-pole synchro-
nous machine.
FIGURE 11.2 Cross section of a primitive two-pole cylindrical rotor syn-
chronous machine.
POLE PITCH: ELECTRICAL DEGREES
The pole pitch is defined as
360
P
where P is the number of poles. The pole pitch is an arc, given in degrees or radians. For
example, if P 2, then 180°.
AIR GAP AND MAGNETIC CIRCUIT OF A
SYNCHRONOUS MACHINE
Air Gap. The radial distance between the rotor and the stator is called the air gap. It is
represented in Figs. 11.1 and 11.2 by the symbol g.
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