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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.

Q: What are v and inverted v curves?

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like a V ok

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Presumably no curves at all.

If the question can be answered then the curves are no longer undefined!

The Curse of Curves was created in 2006.

Related questions

what are 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 power is maximum when load angle is equal to impedance angle.A linear motor is a essentially a multi phase

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like a V ok

It is called a circumflex.

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In an inverted sentence pattern, the usual word order of a subject-verb-object is changed for emphasis or style. For example, "In the garden sat a lovely butterfly" instead of "A lovely butterfly sat in the garden." This inversion can lead to a more poetic or dramatic effect in writing.

An inverted V on a map typically represents a valley. It is a symbol used to indicate low-lying land between two higher points or mountain ranges. This symbol helps to illustrate the topography and elevation changes of the area.

Backward ran the sentences until reeled the mind.

* invented * involved * invision * invasion * advanced * inverted

The Greek letter L (looks like an inverted capital V) which stood for the Spartan territory of Laconia.

Michael V Levine has written: 'Identifying different item response curves' -- subject(s): Response consistency, Mathematical models