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V Curve
In synchronous machines, the V curve (also spelled as V-curve) is the graph showing the relation of Armature (electrical engineering), armature current as a function of Stator, field current in synchronous motors keeping the load constant. The name comes from an observation made by William Morris Mordey, W. M. Mordey in 1893 that the curve resembles a letter V. The lowest point of the curve corresponds to the unity power factor. For a motor, points on the left of the minimum correspond to underexcitation (and therefore the armature current would "Power factor#Lagging, leading and unity power factors, lag" the voltage), on the right - to overexcitation (and "Power factor#Lagging, leading and unity power factors, lead"). Typically multiple V curves are plotted based on the experiments, each corresponding to its own load value. The minimum at unity power factor (\cos \phi) is due to the general formula for the power of a synchronous motor, P = \sqrt 3 V_A I_A \cos \phi. In order to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V Curve Synchronous Motor
V, or v, is the twenty-second Letter (alphabet), letter of the Latin alphabet, used in the English alphabet, modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is English alphabet#Letter names, ''vee'' (pronounced ), plural ''vees''. Name * (); in dialects that lack contrast between and , the letter is called , "low B/V". * * * * or *Japanese language, Japanese: is called a variety of names originating in English, most commonly or , but less nativized variants, violating to an extent the phonotactics of Japanese, of ー , or , and are also used. The phoneme in Japanese is used properly only in loanwords, where the preference for either or depends on many factors; in general, words that are perceived to be in common use tend toward . * * * is recommended, but is traditional. If is referred to as the latter, it would have the same pronunciation as the letter in Spanish (i.e. after pause ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
