# What are v and inverted v curves?

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V Curve- Excitation vs Armature current

V curve is the graph showing the relation of armature current as a function of field current in synchronous machines. The purpose of the curve is to show the variation in the magnitude of the armature current as the excitation voltage of the machine is varied.

Inverted V Curve- Excitation vs Power Factor

The synchronous motor "V Curves" shown above illustrate the effect of excitation (field amps) on the armature (stator) amps and on system power factor. There are separate "V" Curves for No-Load and Full-Load and sometimes the motor manufacturer publishes curves for 25%, 50%, and 75% load. Note that the Armature Amperage and Power Factor "V" Curves are actually inverted "V's".

Assume it is desired to determine the field excitation which will produce unity power factor operation at full motor load. Project across from the unity power factor (100%) operating point on the Y-Axis to the peak of the inverted Power Factor "V" Curve (blue line). From this intersection, project down (red line) from the full-load unity power factor (100%) operating point to determine the required field current on the X-Axis.

In this example the required DC field current is shown to be just over 10 amps. Note at unity power factor operation the armature (stator) full-load amps is at the minimum value.

Increasing the field amps above the value required for unity power factor operation will cause the machine to run with a leading power factor, while field weakening caused the motor power factor to become lagging. When the motor runs either leading or lagging, the armature (stator) amps increases above the unity power factor value.
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# How field current change in 'V and inverted v curves ' of synchronous motor?

In v curves armature current decreases in under excitation and increase in overexcitation as fielcurrent increases and armature current is maximum at unity power factor.The po

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It is called a circumflex.

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Coalition markings, used to identify friendly vehicles visually to other coalition forces.

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Backward ran the sentences until reeled the mind.
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# What is v curve and inverted v curve of sychronous motor?

what are v and inverted v curves of synchronous motor

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The Capital letter S with an inverted V may be actually a Capital letter S with the letter "A" superimposed on it. The crass mark in the letter "A" may be obliterated by part
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It would be at least 250 amps, maybe 300 amps.