KEVOS® MAKEOS · Hydraulics
Hydraulic Motor Torque, Speed and Power
What torque, speed and power will this hydraulic motor give for this flow and pressure?
Output torque, speed and power of a hydraulic motor from displacement, pressure difference, flow and volumetric and mechanical efficiencies.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Displacement | cm³/rev | Geometric displacement per revolution from the motor data sheet. |
| Pressure difference across motor | bar | Inlet pressure minus outlet (case or return) pressure. |
| Flow to motor | L/min | Flow supplied to the motor. |
| Volumetric efficiency | % | Volumetric efficiency at this speed and pressure, from the maker. |
| Mechanical efficiency | % | Mechanical (hydromechanical) efficiency from the maker. |
Method and formulas
- Torque T = Vd × Δp × η_m ÷ 20π (cm³, bar → N·m).
- Speed n = Q × 1000 × η_v ÷ Vd (rpm).
- Hydraulic power = Q × Δp ÷ 600 (kW); output = 2π n T ÷ 60 000.
- Example: 100 cm³/rev at 150 bar and 60 L/min gives 219.63 N·m at 570 rpm.
Limitations
- Efficiencies vary with speed, pressure and oil viscosity; starting torque is lower than running torque.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Select a hydraulic motor for a winch, wheel or conveyor
- Check pump flow for a motor speed
- Estimate output power
Who it is for
- Hydraulic and process engineers
- Maintenance engineers
- Design engineers
What you get
- Output torque
- Output speed
- Output and hydraulic power
- Overall efficiency
Interpreting the result
- Check starting torque against breakaway load using the maker’s starting efficiency.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 352–368. Topic reference; no source tables or recommended settings are reproduced.
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