Motor Torque Calculator
Calculate motor torque for various motor types
Motor Torque Calculator
Compliant with IEC 60034 Standards
Results:
Torque (Nm): 0.00
Torque (lb-ft): 0.00
How to Use the Calculator
Motor Torque Calculation
- Enter the motor's Power in Kilowatts (kW).
- Input the Rotational Speed in Revolutions Per Minute (RPM).
- Provide the motor's Efficiency (a value between 0 and 1, e.g., 0.85 for 85% efficiency).
- Click 'Calculate' to get the torque in Newton-meters (Nm) and pound-feet (lb-ft).
Motor Torque Fundamentals
Torque Definition
Torque is the rotational equivalent of linear force. It is a measure of the force that causes an object to rotate about an axis. In motors, torque is the twisting force that the motor produces to turn a load.
Factors Affecting Torque
- Power (kW): The rate at which work is done. Higher power generally means higher torque for a given RPM.
- Rotational Speed (RPM): The number of revolutions per minute. For a given power, higher RPM means lower torque.
- Efficiency: The ratio of output power to input power. Motor losses reduce the effective power available for torque production.
Key Formulas:
Torque (Nm) = (9550 × Power (kW) × Efficiency) / RPM
Torque (lb-ft) = Torque (Nm) × 0.737562
Calculation Formulas
Torque in Newton-meters (Nm):
TNm = (9550 × PkW × η) / N
Torque in Pound-feet (lb-ft):
Tlb-ft = TNm × 0.737562
Where: PkW = Power in kW, η = Efficiency, N = RPM
Example Calculation
Motor Parameters:
Power (kW): 7.5 kW
RPM: 1450 RPM
Efficiency: 0.88
TNm = (9550 × 7.5 × 0.88) / 1450 = 43.5 Nm
Tlb-ft = 43.5 × 0.737562 = 32.09 lb-ft
Torque = 43.50 Nm | Torque = 32.09 lb-ft
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