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kW - Amper Hesaplayıcı
🚜 Motor Boyutlandırma

HP'den Amper'e Hesap Makinesi

Gerekli akım çekişini bulmak için motorunuzun Beygir Gücü değerini ve verimliliğini girin. Motor yol vericilerinin, kontaktörlerin ve koruma şalterlerinin boyutlandırılması için gereklidir.

Motor Yük Analizi

Mekanik HP → Elektrik Akımı

Ondalıklar
2
Hesaplanan Akım Çekişi
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A

Motorunuz için Tam Yük Amper (FLA) gereksinimi.

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—

Dönüşüm Formülü

Bir mekanik beygir gücü tam olarak 746 watt'a eşittir — tüm HP-amper dönüşümlerinin temelidir.

DC Motorlar
I = (HP × 746) ÷ (V × Eff)

Verimlilik (Eff) motor kayıplarını hesaba katar — %90 verimli bir motor, HP çıkışının ima ettiğinden daha fazla akım çeker.

1-Fazlı AC Motorlar
I = (HP × 746) ÷ (V × Eff × PF)

AC motorlar verimliliğe ek olarak güç faktörü gerektirir — her ikisi de giriş akımına göre etkili güç iletimini azaltır.

3-Fazlı AC Motorlar
I = (HP × 746) ÷ (√3 × V × Eff × PF)

Üç fazlı motorlar akımı üç faz arasında dağıtır — √3 faktörü (1,732) hat-hat voltaj ilişkisini hesaba katar.

How to Convert Horsepower to Amps

Horsepower (HP) is a mechanical power rating used to describe motor output capacity. To find the electrical current (amps) a motor draws from the supply, you need to account for the mechanical-to-electrical conversion constant (746 W/HP), the motor's efficiency, and — for AC motors — the power factor. This calculation is essential for sizing motor starters, circuit breakers, cables, and variable frequency drives (VFDs).

Why 746 Watts Per Horsepower?

One mechanical horsepower is defined as exactly 550 foot-pounds per second, which converts to 745.7 watts. This constant is the universal bridge between mechanical and electrical motor ratings. Electric motors are rated in both HP (output) and kW (input), with the difference representing heat losses in the motor windings and core.

Motor Nameplate Data You'll Need

  • HP Rating: The mechanical output power the motor is designed to deliver at full load.
  • Voltage (V): The supply voltage the motor is designed for — often listed as dual voltage (e.g., 230/460V).
  • Efficiency (η): Found on the nameplate as a percentage. Premium-efficiency motors typically run 90–96%.
  • Power Factor (PF): Listed on the nameplate or in the datasheet. Induction motors typically have PF of 0.80–0.92 at full load.
  • Full Load Amps (FLA): The nameplate should also list FLA directly — cross-check your calculated value against this number.

Step-by-Step Conversion

  1. Read the HP: Use the motor's rated output horsepower from the nameplate.
  2. Multiply by 746: Convert HP to watts (1 HP = 746W).
  3. Divide by Voltage: Include the √3 factor for three-phase line voltage.
  4. Apply Efficiency: Divide by motor efficiency as a decimal (e.g., 0.90 for 90%).
  5. Apply Power Factor (AC): Divide by PF for AC motors.
  6. Size Protection at 125%: NEC requires motor branch-circuit conductors rated at 125% of FLA for continuous operation.