Motor Power Factor Calculator
Calculate power factor (PF) for electrical motors. Determine PF from real power (kW), apparent power (kVA), voltage, current, and efficiency for improved electrical efficiency.
Step 1: Motor Specifications
Power Factor Formula
Power Factor (PF) = Real Power (kW) / Apparent Power (kVA)
PF = P (kW) / S (kVA)
Step 2: Motor Type & Options
Typical Power Factor Ranges
Excellent: 0.95 – 1.00
Good: 0.85 – 0.95
Average: 0.75 – 0.85
Poor: 0.60 – 0.75
Very Poor: < 0.60
Power Factor Results
Motor Power Factor
Motor Type Comparison
| Motor Type | Typical PF | Efficiency | Application |
|---|
Power Factor Formulas
Power Factor = Real Power (kW) / Apparent Power (kVA)
Where:
• Real Power (P) = Actual power used (kW)
• Apparent Power (S) = Total power supplied (kVA)
• Reactive Power (Q) = Power stored and returned (kVAR)
Other Formulas:
• S = √(P² + Q²)
• Q = √(S² – P²)
• P = V × I × PF × √3 (for 3-phase)
• PF = P / (V × I × √3) (for 3-phase)
Example Calculation
Example: 50 kW Motor at 240V, 150A
Real Power (P): 50 kW
Apparent Power (S): V × I × √3 / 1000
240V × 150A × 1.732 / 1000 = 62.35 kVA
Power Factor:
PF = 50 kW / 62.35 kVA = 0.80 (80%)
Reactive Power:
Q = √(62.35² – 50²) = √(3887 – 2500) = √1387 = 37.24 kVAR
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