VFD tizimida tormoz rezistori nima?

Tormoz rezistori dvigatel erkin to'xtashdan tezroq sekinlashganda regenerativ energiyani issiqlik sifatida dissipatsiya qiladi. VFD-ning tormoz chopperi DC shinasidagi kuchlanish chegaradan (odatda nominal DC shinasi kuchlanishining 115-130%) oshib ketganda shinani rezistorga ulaydi.

Tormoz rezistori qiymatini qanday hisoblash mumkin?

R_min = V²dc / P_brake, where Vdc is the DC bus voltage (typically √2 × V_line) and P_brake is the maximum braking power. The resistor must handle peak braking power without exceeding the brake chopper's current limit.

Umumiy ta'minot kuchlanishlari uchun DC shina kuchlanishi qancha?

DC bus ≈ √2 × V_line. For 400V supply: Vdc ≈ 565V (brake threshold ~750V). For 480V: Vdc ≈ 680V (threshold ~800V). For 230V: Vdc ≈ 325V (threshold ~400V).

Tormozlash quvvatini qanday aniqlash mumkin?

P_brake = J × ω² / (2 × t_decel), where J is total inertia (kg·m²), ω is angular velocity (rad/s), and t_decel is deceleration time. For quick estimation: P_brake ≈ P_motor × (rated_speed/decel_time) for full-speed stops.

Qanday ish sikli koeffitsientidan foydalanishim kerak?

Duty cycle = braking_time / cycle_time × 100%. Typical: 5-10% for occasional stops, 20-40% for frequent cycling. The continuous power rating of the resistor = peak power × duty cycle. Check the VFD manual for maximum allowed duty cycle.

Muhandislik uchun bepul vosita

Tormozlash rezistori kalkulyatori

VFD ilovalari uchun dinamik tormoz rezistorini o'lchamlang. R = V²_dc / P_brake. Har bir tormozlash sikli uchun qarshilik, quvvat reytingi va energiyani hisoblang.

VFD BrakingR = V²/PEnergy / Cycle

Results

Minimal Tormozlash Qarshiligi

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Maksimal tormozlash quvvati

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Bir tsikldagi energiya

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Uzluksiz ish quvvati

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DC Bus Voltage

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Tormozlash qarshiligi

Kinetik energiya & tormozlash quvvati

⚠️ Har doim VFD ishlab chiqaruvchisining ma'lumotlar varaqasi bilan tekshiring. Minimal qarshilik tormoz chopperining tok chegarasidan oshmasligi kerak.

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