Hydraulic Motor Torque Calculator
SI
Imp
Imperial
Inputs
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Motor displacement
(Vd)
Motor displacement per revolution.
cm³
Pressure drop
(Δp)
Pressure drop across the motor, not just pump relief setting.
bar
Motor speed
(n)
Target output speed.
rpm
Mechanical efficiency
(η_m)
Torque efficiency after friction losses.
Volumetric efficiency
(η_v)
Flow efficiency after leakage losses.
Results
Default result
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Output torque
(T)
114.6
N·m
Also computed
Required inlet flow
(Q)
16.3
L/min
Shaft power out
3.6
kW
Hydraulic power in
4.348
kW
Input fluid power from Q × Δp.
Method notes
3 notes
Torque comes from pressure drop across the motor, not from nominal pump pressure if valves or lines consume pressure.
Required flow is geometric displacement × speed divided by volumetric efficiency; leakage means the supplied flow must be higher than ideal.
Use the motor manufacturer curve for final sizing; efficiency changes with pressure, speed and oil viscosity.
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