Overview
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A salient-pole synchronous generator is used to produce electricity, such
as water power generators that produce energy from water falling and turning
a water wheel. Reducing the magnetic saturation is one area of focus for
generators because the output that can be produced decreases with magnetic
saturation. For this reason, it is advantageous to investigate the magnetic
circuit with a magnetic field analysis.
This example presents the use of a magnetic field analysis to obtain the
magnetic flux density distribution, no-load saturation curve, and output
of a salient-pole synchronous generator. |
No-load Saturation Curve/ Magnetic Flux Density Distribution
The no-load saturation curve is indicated in Fig. 1 and the magnetic flux
density distribution for an excitation current of 75 A and 100 A at 0.005
seconds is indicated in Fig. 2.
The slope of the no-load saturation curve decreases after exceeding an
excitation current of 75 A. The magnetic flux density increases in the
teeth of the rotor core and stator core as the excitation current gets
larger and the no-load saturation curve decreases because the magnetic
saturation increases. |
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Output
The time versus current of the shaft resistance when the excitation current
is 75 A is indicated in Fig. 3.
The average output current of the salient-pole synchronous generator is
880 A. |
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