1) This question is about synchronous induction motors on infinite busbars. The exciter current induces a back emf (E) and the magnitude and angle of the current will depend on E's magnitude. a) Look at this phasor diagram in FIG 1, copy it and identify the power factor and the load angle by circling it on the FIGURE. V IX S E 010 FIG 1 b) What can be said about the generated EMF if there is no load? c) Describe the significance of IXS d) Draw two more phasor diagrams of the machine operating at constant load i) with power factor unity ii) power factor leading e) Describe what happens to the stator current of the synchronous motor as the excitation current changes
1) This question is about synchronous induction motors on infinite busbars. The exciter current induces a back emf (E) and the magnitude and angle of the current will depend on E's magnitude. a) Look at this phasor diagram in FIG 1, copy it and identify the power factor and the load angle by circling it on the FIGURE. V IX S E 010 FIG 1 b) What can be said about the generated EMF if there is no load? c) Describe the significance of IXS d) Draw two more phasor diagrams of the machine operating at constant load i) with power factor unity ii) power factor leading e) Describe what happens to the stator current of the synchronous motor as the excitation current changes
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:1) This question is about synchronous induction motors on infinite busbars. The
exciter current induces a back emf (E) and the magnitude and angle of the current will
depend on E's magnitude.
a) Look at this phasor diagram in FIG 1, copy it and identify the power factor and
the load angle by circling it on the FIGURE.
V
IX
S
E
010
FIG 1
b) What can be said about the generated EMF if there is no load?
c) Describe the significance of IXS
d) Draw two more phasor diagrams of the machine operating at constant load
i) with power factor unity
ii) power factor leading
e) Describe what happens to the stator current of the synchronous motor as the
excitation current changes
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