Ampere ad Cavalli Calcolatrice
Calcola inversamente la potenza in uscita del tuo motore in cavalli in base alla corrente che assorbe dalla linea. Perfetto per verificare le specifiche dell'apparecchiatura sul campo.
Audit di Potenza del Motore
Amperaggio → HP in Uscita
Cavalli all'albero in base all'ingresso elettrico.
La Formula di Conversione
La potenza in uscita del motore viene calcolata dall'ingresso elettrico — efficienza e fattore di potenza determinano quanta energia diventa lavoro meccanico.
Motori CC
HP = (I × V × Eff) ÷ 746 La potenza elettrica in ingresso (I × V) moltiplicata per l'efficienza dà i watt in uscita, che si dividono per 746 per ottenere i cavalli.
Motori CA Monofase
HP = (I × V × Eff × PF) ÷ 746 I motori CA richiedono il fattore di potenza — solo la parte di potenza reale (V × I × PF) si converte in uscita meccanica.
Motori CA Trifase
HP = (√3 × I × V × Eff × PF) ÷ 746 Il fattore √3 tiene conto della distribuzione di potenza su tre fasi. I motori trifase erogano più potenza per ampere rispetto ai monofase.
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.