एक प्रेरण मोटर का प्रारंभिक बलआघूर्ण ____________होता है ,जब रोटर प्रतिरोध घूर्णक प्रतिघात के बराबर होता है।

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. न्यूनतम
  2. स्थिरांक
  3. अधिकतम
  4. शून्य

Answer (Detailed Solution Below)

Option 3 : अधिकतम
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बलआघूर्ण​ समीकरण:

तीन-चरण प्रेरण मोटर का बलआघूर्ण​ समीकरण निम्न द्वारा दिया गया है,

\(T = \frac{{180}}{{2\pi {N_s}}}\left( {\frac{{sV^2{R_2}}}{{\left( {R_2^2 + {s^2}X_2^2} \right)}}} \right)\)

जहाँ Ns तुल्‍यकालिक गति है

V = वोल्टेज आपूर्ति

R2 = रोटर प्रतिरोध

X2 = रोटर प्रतिघात

s स्लिप है

उपरोक्त अभिव्यक्ति से, हम कह सकते हैं कि प्रेरण मोटर का बलआघूर्ण रोटर प्रतिरोध और स्लिप पर निर्भर करता है।

अधिकतम बलआघूर्ण के लिए स्थिति:

प्रारम्भ में अधिकतम बलआघूर्ण प्राप्त करने की स्थिति निम्न है,

\({s_m} = \frac{{{R_m}}}{{{X_m}}} = 1\)

X= R­m

जहाँ,

Rm = प्रति चरण मोटर प्रतिरोध

Xm = प्रति चरण मोटर प्रतिघात

तीन-चरण सर्पी रिंग प्रेरण मोटर के प्रारम्भ में

सर्पी (s) = 1 (प्रारम्भ में Nr = 0)

इसलिये\({s_m} = \frac{{{R_m}}}{{{X_m}}} = 1\)

 Xm = Rm

इसलिए एक प्रेरण मोटर का प्रारंभिक बलआघूर्ण अधिकतम होता है, जब रोटर प्रतिरोध रोटर प्रतिघात के बराबर होता है।

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