Motor Power Factor Calculator
Accurate power factor calculations for AC motor systems
Motor Power Factor Calculator
Compliant with IEC 60034 Standards
Results:
Power Factor (PF): 0.00
How to Use the Calculator
AC Single Phase Motor
- Select "AC" system type
- Choose "Single Phase"
- Enter Motor Power (HP or kW)
- Provide Voltage (V) and Current (A)
- Input Motor Efficiency (0-100%)
AC Three Phase Motor
- Select "AC" system type
- Choose "Three Phase"
- Enter Motor Power (HP or kW)
- Provide Voltage (V) and Current (A)
- Input Motor Efficiency (0-100%)
Motor Power Factor Fundamentals
Power Factor
Power factor (PF) is the ratio of real power (kW) to apparent power (kVA) in an AC circuit. It indicates how effectively electrical power is being converted into useful work output.
- A higher PF (closer to 1) means more efficient power usage.
- Low PF can lead to increased energy costs and larger current draw.
Key Formulas:
Output Power (Watts) = HP × 746 (or kW × 1000)
Input Power (Watts) = Output Power (Watts) / (Efficiency / 100)
Apparent Power (VA) Single Phase = V × I
Apparent Power (VA) Three Phase = √3 × V × I
Calculation Formulas
AC Single Phase Motor:
PF = (Motor Power (W)) / (V × I × (Efficiency / 100))
AC Three Phase Motor:
PF = (Motor Power (W)) / (√3 × V × I × (Efficiency / 100))
Example Calculation
Three Phase AC Motor:
Motor Power: 10 HP
Voltage: 400V
Current: 15A
Efficiency: 85%
Output Power (W) = 10 HP × 746 = 7460 W
Input Power (W) = 7460 W / (85 / 100) = 8776.47 W
Apparent Power (VA) = √3 × 400V × 15A = 10392.3 VA
PF = 8776.47 W / 10392.3 VA = 0.844
Power Factor (PF) = 0.84
Related Power Calculators
Star-Delta Motor Current Calculator
Determine current in star and delta configurations.
Try CalculatorStar-Delta Motor Cable Size Calculator
Calculate appropriate cable size for star-delta motors.
Try Calculator