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Pneumatics & Hydraulics

Hydraulic motor torque and speed

Output torque and speed of a hydraulic motor.

cc/rev
bar
L/min
%
%

Calculating…

How it's calculated

T [Nm] = Vg [cc] × Δp [bar] ÷ (20π) × ηmh n [rpm] = Q [L/min] × 1000 × ηv ÷ Vg

Torque depends on pressure and displacement; speed depends on flow. Δp is inlet pressure minus outlet (back) pressure, so a restricted return line reduces torque.