Motor Current Calculator
Calculate motor current for various AC/DC motor types
Motor Current Calculator
Compliant with IEC 60034 Standards
Results:
Current (A): 0.00
How to Use the Calculator
AC Single Phase Motor
- Select "AC" system type
- Choose "Single Phase"
- Select Power Unit (kW/HP) and enter value
- Enter line-to-neutral voltage
- Input power factor (0-1)
- Provide motor efficiency (%)
AC Three Phase Motor
- Select "AC" system type
- Choose "Three Phase"
- Select Power Unit (kW/HP) and enter value
- Enter line-to-line voltage
- Input power factor (0-1)
- Provide motor efficiency (%)
DC Motor Systems
- Select "DC" system type
- Select Power Unit (kW/HP) and enter value
- Enter voltage
- Power factor is not applicable
- Provide motor efficiency (%)
Motor Current Fundamentals
AC Motor Current
In AC motor systems, current calculations consider:
- Phase configuration (Single/Three)
- Power factor (cosφ)
- Motor Efficiency
- Voltage type (Line-to-Line/Line-to-Neutral)
DC Motor Current
- No phase or power factor considerations
- Current depends on Power, Voltage, and Efficiency
- Simple P / (V * Eff) calculation
Key Formulas:
Single Phase AC: I = (P × 1000) / (V × PF × Eff)
Three Phase AC: I = (P × 1000) / (√3 × V × PF × Eff)
DC: I = (P × 1000) / (V × Eff)
Note: P is in kW, Eff is efficiency as a decimal (e.g., 0.85 for 85%)
Calculation Formulas
AC Single Phase:
I = (PkW × 1000) / (V × PF × Eff)
AC Three Phase:
I = (PkW × 1000) / (√3 × V × PF × Eff)
DC Systems:
I = (PkW × 1000) / (V × Eff)
For Horsepower (HP) input, multiply HP by 746 instead of 1000.
Example Calculation
Three Phase AC Motor:
Power: 10 kW
Voltage: 400V
PF: 0.85
Efficiency: 90% (0.9)
I = (10 × 1000) / (√3 × 400 × 0.85 × 0.9)
I = 10000 / (1.732 × 400 × 0.85 × 0.9)
I = 10000 / 530.568 ≈ 18.85 A
Current = 18.85 A
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