1. Muammo: 4A160S2Y3 seriyali uch fazali rotori qisqa tutashgan asinxsron motor uchun nominal va ishga tushirish toklarini, momentlarni va boshqa texnik ko'rsatkichlarni hisoblash. 2. Formulalar va qoidalar: - Sirpanish: $s_{nom} = \frac{n_1 - n_{2nom}}{n_1}$ - Moment: $M = 9.55 \times \frac{P}{n}$ - Ishga tushirish momenti: $M_{ish.t} = M_{nom} \times \frac{M_{ish.t}}{M_{nom}}$ - Maksimal moment: $M_{max} = M_{nom} \times \frac{M_{max}}{M_{nom}}$ - Nominal stator tok: $I_{1nom} = \frac{P_{nom}}{m_1 \times U_1 \times \eta_{nom} \times \cos \phi}$ - Ishga tushirish tokining nominalga nisbati: $I_{ish.t} = I_{nom} \times \frac{I_{ish.t}}{I_{nom}}$ - Stator chulg'amlarining "uchburchak" ulanishida tok: $I_{1\Delta} = 1.73 \times I_1$ 3. Berilgan ma'lumotlar 4A160S2Y3 uchun: - $P_{nom} = 15000$ W - $n_{2nom} = 2940$ ayl/min - $\eta_{nom} = 0.88$ - $\cos \phi = 0.91$ - $\frac{I_{ish.t}}{I_{nom}} = 7.0$ - $\frac{M_{ish.t}}{M_{nom}} = 1.4$ - $\frac{M_{max}}{M_{nom}} = 2.2$ - $U_1 = 220$ V (yulduzcha ulanish uchun) - $m_1 = 3$ (fazalar soni) - $n_1 = 3000$ ayl/min (sinxron aylanish chastotasi) 4. Sirpanishni hisoblaymiz: $$s_{nom} = \frac{3000 - 2940}{3000} = 0.02 = 2\%$$ 5. Nominal momentni hisoblaymiz: $$M_{nom} = 9.55 \times \frac{15000}{2940} = 48.78\, \text{N}\cdot\text{m}$$ 6. Ishga tushirish momenti: $$M_{ish.t} = 48.78 \times 1.4 = 68.29\, \text{N}\cdot\text{m}$$ 7. Maksimal moment: $$M_{max} = 48.78 \times 2.2 = 107.32\, \text{N}\cdot\text{m}$$ 8. Nominal stator tokini hisoblaymiz: $$I_{1nom} = \frac{15000}{3 \times 220 \times 0.88 \times 0.91} = \frac{15000}{529.34} = 28.34\, A$$ 9. Ishga tushirish tokini hisoblaymiz: $$I_{ish.t} = 28.34 \times 7.0 = 198.38\, A$$ 10. Stator chulg'amlarini "uchburchak" ulanganda tok: $$I_{1\Delta} = 1.73 \times 28.34 = 49.01\, A$$ Natija: - Sirpanish $s_{nom} = 2\%$ - Nominal moment $M_{nom} = 48.78$ N·m - Ishga tushirish momenti $M_{ish.t} = 68.29$ N·m - Maksimal moment $M_{max} = 107.32$ N·m - Nominal stator tok $I_{1nom} = 28.34$ A - Ishga tushirish tok $I_{ish.t} = 198.38$ A - Stator tok "uchburchak" ulanishda $I_{1\Delta} = 49.01$ A Bu hisoblashlar 4A160S2Y3 motorining texnik ma'lumotlariga asoslangan.