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Yulduz-Uchburchak Ishga Tushirgich Kalkulyatori
DOL va Yulduz-Uchburchak (Y-Δ) motor yurgizishni solishtiring. Yurgizish toklari, momentlari, kontaktor o'lchamlari va o'tish vaqtini hisoblang.
Taqqoslash natijalari
Yulduz-Uchburchak ishga tushirish printsipi
Y-Δ ishga tushirishda motor o'ramlari dastlab yulduz (Y) sxemasida ulanadi, bu har bir o'ramdagi kuchlanishni V gacha kamaytiradiL/√3. Motor ~80% tezlikka yetgach, to'liq kuchlanishda ishlash uchun uchburchak (Δ) sxemasiga o'tadi.
Both current and torque are reduced by a factor of 3 (not √3). This is because the winding voltage is reduced by √3, and both current and torque scale with voltage².
Kontaktorni tanlash
- KM1 (Asosiy/Liniya) — To'liq liniya tokini o'tkazadi; nominal tok bo'yicha tanlanadi
- KM2 (Delta) — Carries phase current = line current / √3 ≈ 58% of rated
- KM3 (Star) — Yulduz tokini o'tkazadi = liniya toki / 3 ≈ nominalning 33%
Kommutatsiya vaqti bo'yicha ko'rsatmalar
The timer for star-to-delta transition should be set so the motor reaches approximately 75–85% of rated speed before switching. Too early = high transition current spike. Too late = motor overheats in star.
| Motor Power | Tavsiya etilgan taymer | Notes |
|---|---|---|
| Up to 7.5 kW | 3–5 seconds | Kichik motorlar tez tezlanadi |
| 7.5–30 kW | 5–10 seconds | O'rta motorlar, tipik sanoat |
| 30–90 kW | 8–15 seconds | Katta motorlar, yuqori inersiya |
| >90 kW | 10–20 seconds | Juda katta motorlar, tokni nazorat qilish orqali sozlash |
Taqqoslash: Ishga tushirish usullari
| Method | Ishga tushirish toki | Ishga tushirish momenti | Cost | Best For |
|---|---|---|---|---|
| DOL | 6–8× In | 1.5–2.5× Tn | Low | Kichik motorlar <7.5 kW |
| Star-Delta | 2–3× In | 0.5–0.8× Tn | Medium | O'rta motorlar, engil ishga tushirish yuklamasi |
| Soft Starter | 2–4× In | 0.5–1.5× Tn | Medium-High | Yumshoq ishga tushirish, nasoslar, konveyerlar |
| VFD | 1–1.5× In | 1.5× Tn | High | O'zgaruvchan tezlik, energiyani tejash |
| Autotransformer | 1.5–4× In | Adjustable | Medium-High | Yuqori inersiyali yuklamalar, sozlanuvchi ulanish joylari |
⚠️ Important: Yulduz-uchburchak ishga tushirish faqat liniya kuchlanishida uchburchak ulash uchun mo'ljallangan motorlar uchun ishlaydi (masalan, 400V Δ / 690V Y). Motor yorlig'ida ikki qiymatli kuchlanish ko'rsatilgan bo'lishi shart. Y-Δ ishga tushirish momentini ÷3 ga kamaytiradi, bu yuqori inersiyali yuklamalar uchun yetarli bo'lmasligi mumkin.
Amaliy Misol
Given: 22 kW, 400V, In = 42A, starting multiplier = 7×
DOL starting current = 42 × 7 = 294 A
Y-Δ starting current = 294 / 3 = 98 A
To'g'ridan-to'g'ri ishga tushirish momenti = 1.5× Tn
Y-Δ ishga tushirish momenti = 0.5× Tn — markazdan qochma nasoslar/ventilyatorlar uchun yetarli, yuklangan konveyerlarda to'xtab qolishi mumkin
Motor ishga tushirish muammolarini va tebranish muammolarini professional asboblar yordamida diagnostika qiling.
