Ampere till Hästkrafter Kalkylator
Beräkna omvänt din motors uteffekt i hästkrafter baserat på strömmen den drar från linjen. Perfekt för att verifiera utrustningsspecifikationer i fält.
Motoreffektsgranskning
Strömstyrka → Uteffekt HP
Axelhästkrafter baserat på elektrisk ineffekt.
Omvandlingsformeln
Motorns uteffekt i hästkrafter beräknas från elektrisk ineffekt — verkningsgrad och effektfaktor avgör hur mycket energi som blir mekaniskt arbete.
DC-motorer
HP = (I × V × Eff) ÷ 746 Elektrisk ineffekt (I × V) multiplicerad med verkningsgrad ger uteffekt i watt, som divideras med 746 för att ge hästkrafter.
1-fas AC-motorer
HP = (I × V × Eff × PF) ÷ 746 AC-motorer kräver effektfaktor — endast den verkliga effektdelen (V × I × PF) omvandlas till mekanisk uteffekt.
3-fas AC-motorer
HP = (√3 × I × V × Eff × PF) ÷ 746 Faktorn √3 tar hänsyn till effektfördelningen över tre faser. Trefasmotorer levererar mer effekt per ampere än enfas.
How to Convert Amps to Horsepower
Converting amps to horsepower lets you determine a motor's mechanical output from its electrical input measurements. This is useful when the motor nameplate is damaged or missing, when verifying motor performance, or when comparing measured current draw to the rated HP. The key insight: not all electrical input becomes mechanical output — efficiency and power factor dictate how much is lost as heat.
Understanding Motor Efficiency
Motor efficiency is the ratio of mechanical output power to electrical input power. A 5 HP motor drawing 15A at 240V and 0.85 PF consumes about 3,060W of real input power. At 90% efficiency, it delivers 2,754W (≈ 3.69 HP) of mechanical output. The rest becomes heat in the windings. Premium-efficiency motors minimize this loss.
When to Use This Calculation
- Verifying Motor Output: Measure FLA with a clamp meter and calculate HP to confirm the motor is delivering its rated output.
- Troubleshooting Overloads: If the calculated HP is significantly below rated, the motor may be worn, undersized, or operating with a degraded power factor.
- Pump and Fan Selection: When replacing driven equipment, knowing actual HP output (not just nameplate) prevents under-sizing the new load.
- Energy Audits: Calculate actual HP output versus nameplate rating to identify inefficient motors worth replacing with premium-efficiency units.
Step-by-Step Conversion
- Measure or Find the Current: Use a clamp meter for measured FLA, or use the nameplate value.
- Note the Supply Voltage: Use line-to-line voltage for three-phase; line-to-neutral for single-phase.
- Multiply by Efficiency: Motor efficiency in decimal form (85% = 0.85).
- Multiply by Power Factor (AC): Typical induction motors run 0.80–0.92 PF at full load.
- Divide by 746: Convert watts to horsepower using the 746 W/HP constant.