How to Use Our Motor Torque Calculator
Selecting the correct drive unit is a critical step in mechanical design. Whether you are sizing a gearbox for a heavy-duty rotary dryer drum, an industrial conveyor, or a high-capacity fan, using a precise motor torque calculator ensures that your equipment will not suffer from premature failure due to undersizing.
- T (Torque): Output torque in Newton-meters (Nm).
- P (Power): Motor power in Kilowatts (kW).
- n (Speed): Output speed of the gearbox shaft in Revolutions Per Minute (RPM).
- 9550: A constant derived from converting kW and RPM into Nm (approx. 30,000 / π).
Why is the Service Factor (fs) Important?
Nominal torque represents the continuous load under ideal conditions. However, real-world industrial applications involve shock loads, frequent starts/stops, and varying operational hours. This is why our motor torque calculator includes a Service Factor (fs) input, which acts as a safety multiplier. For uniform loads (like centrifugal fans), an fs of 1.0 – 1.25 might be sufficient. For heavy shock loads (like crushers or large rotary equipment), an fs of 1.5 to 2.0+ is highly recommended to ensure gearbox longevity.
Note: Always consult the specific gearbox manufacturer’s catalog to determine the exact service factor required for your application class and daily operating hours.
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