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Estimation of Motor Loading

AC ေမာ္တာတစ္လံုး၏ Part Load Efficiency သည္ ထုိေမာ္တာ၏ Loading (%) ေပၚတြင္မူတည္သည္။ ထုိေၾကာင့္ AC ေမာ္တာတစ္လံုး၏ Part Load Efficiency ကိုတြက္ရန္ အတြက္ ထုိေမာ္တာ၏ Loading (%)ကိုသိရန္လုိအပ္သည္။ Loading (%)ကိုသိမွသာ Efficiency အမွန္ကန္ဆံုး တြက္ခ်က္နုိင္သည္။

ေမာ္တာ၏ Loading (%) ကို နည္း ၂ နည္း ၿဖင့္တြက္ခ်က္နုိင္သည္။

က) Input Method (ေမာ္တာ၏ Input Electrical power ႏွင့္ Output Mechanical Power ကို ရယူၿပီး ေမာ္တာ၏ Loading (%) ခန့္မွန္းနည္း)

ခ) Slip Method (ေမာ္တာ၏ Rated Slip ႏွင့္ Actual Slip ကို ရယူၿပီး ေမာ္တာ၏ Loading (%) ခန့္မွန္းနည္း)

 

Input Method ဥပမာ

22kW (Name Plate Power) ေမာ္တာတစ္လံုးသည္ ေမာင္းႏွင္ေနသည္အခါ ေအာက္ပါ လွ်ပ္စစ္ အခ်က္အလက္မ်ားကို တုိင္းတာရယူခဲ့သည္။ ထိုေမာ္တာ၏ 100% Load သို့မဟုတ္ Full load Efficiency သည္ 88% ၿဖစ္လွ်င္ ထုိေမာ္တာ၏ Loading (%) ကို ရွာပါ။

Volt (R to Y) = 410 volt , I red phase = 25 amps , Power Factor for Red Phase = 0.86

Volt (Y to B) = 415 volt , I red phase = 27 amps , Power Factor for Red Phase = 0.88

Volt (B to R) = 412 volt , I red phase = 26 amps , Power Factor for Red Phase = 0.87

 

22kW (Name Plate Power သည္ Output Mechanical Power ပင္ၿဖစ္သည္။ Rated Power ဟုလည္းေခၚသည္။) ေမာ္တာတစ္လံုး၏ Input Electrical Power မွာ 25 kWe ၿဖစ္သည္။ေမာ္တာ၏ 100% Load သို့မဟုတ္ Full load Efficiency သည္ 88% ၿဖစ္လွ်င္..

Input Electrical Power of Motor =( Output Mechanical Power or Name Plate Power = 22 ) x 0.88 = 25kWe

ေမာ္တာ၏ Actual Electrical Power မွာ

Actual Electrical Power = 1.73 x Average Volt x Average I x Average Power Factor

                                       1.73x 413.33 Volt x 26 Amp x 0.87 = 16.17 kWe

 

  Actual Electrical Power = 16.17 kWe
Motor Loading = --------------------------------------------------
  Rated Electrical Power = 25kWe

Motor Loading = 64.68 %

 

Slip Method ဥပမာ

ဆက္လက္ေရးရန္

 

ေကာင္းထက္ညြန့္

Motor ႏွင့္သက္ဆုိင္ေသာ ACMV Lecture မ်ား (8 Lectures)
1 AC Induction Motor Motor Losses-လွ်ပ္စစ္ေမာ္တာ၏ စြမ္းအင္ဆံုးရွဳံးမွ Read
2 AC Induction Motor Energy Saving from Motor Efficiency Read
3 AC Induction Motor Motor Speed and Slip Read
4 AC Induction Motor Understanding motor nameplates Read
5 AC Induction Motor Estimation of Motor Loading Read
6 AC Induction Motor Power Factor Read
7 AC Induction Motor Supply Voltage to Motor Read
8 AC Induction Motor Insulation, Service Facotr and Enclosures Read
   

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