1HP = 1 horse power = 745.699872 watts "Levas" <info@gooo.com> wrote in message news:j4818q$ff4$1@trimpas.omnitel.net... > cia iskreiptas variklis, jame galia nurodyta HP :) Ir dar neaisku ar tais > kumeliais nenurodyta elektrine galia :) > > > Paprastai lenteles buna su maziau skaiciuku. > > > O siaip, kiek protingesne citata is interneto: > 1) ELECTRICAL POWER. > The first P, for which you used the equation sqrt(3)*V*I/1,000 = 91.6 kVA, > is not 'real' electrical power but Apparent Power. A more correct > representation is 'S' and its units are VA or kVA. Then, real power, Pi, > is the product of Apparent Power times Power Factor, or S*PF! In-turn, > real input-power, Pi = Po/Eff'y, where Po = 0.746*Hp/Eff'y. (CAVEAT: > metric Hp and English HP are not equal!) > > 2) MECHANICAL POWER. > The 2nd P, for which you used the equation, 5250*RPM/Torque or > 5252*1800/115 =lb(f)-ft, is shaft horsepower, or Hp, a mechanical term. In > addition, you used the synchronous speed to make the calculation. Instead, > output Hp is more correctly rated at the motor's as is normally shown on > its nameplate, not at its synchronous speed. > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > > > > 3) RULE-of-THUMB. > In countries that rate motor output in shaft Hp, a rule-of-thumb value > often used is: input kVA is approximately equal to output Hp. Note the > term approximately because the real kVA/HP ratio does vary. Also note, in > countries using metric units then output shaft-power is expressed in > electrical units or kW. > > 4) MATCHING MOTOR. > Of course, in the absence of other performance data, like pf and > efficiency, then you will never know its exact rating. However, using > typical manufactuter's data, then the 115-A value you mentioned would > yield a 3-ph, 460-V motor of 100-Hp. > > Regards, Phil Corso, PE (cepsicon@aol.com) > > > > -- > Bye, Levas > > -- > http://www.vabolis.lt > > "Dovydas" <dovydas.zakas@gmail.com> wrote in message > news:j4700f$pns$1@trimpas.omnitel.net... >> na a? gal palyginus ir nedaug jø matæs realiai, bet kiek ma?iau, tai ant >> visø buvo ma?daug tokios lentel?s kaip prisegu, kur u?ra?yta el. galia? >> >> "Evaldas" <sanya@takas.lt> wrote in message >> news:j45nmi$h73$1@trimpas.omnitel.net... >>> "Signalizacija" <signalizacija.master@gmail.com> wrote in message >>> news:j45j1h$brb$1@trimpas.omnitel.net... >>>> Cia kuriu taip varikliu? >>> >>> Visu elektriniu motoru. >>> Jei paimsi motoro aprasyma ir jame rasi parasytus kilovatus tai tie >>> kilovatai yra mechanine (veleno) galia.(isskyrus atveji kai nurodyta, >>> kad >>> tai pareikalaujama galia (consuming power) >>> Suprantama, juk perkanciam motora santechnikui reikia zinoti ar pasuks >>> jo >>> siurbli/ventiliatoriu ir santechnikui visiskai px kiek elektros srebia. >>> Cia >>> jau alektriko rupestis. >>> >>> >> >> >>