Hydraulic Motor Calculation

Post by **amh** » Sat Feb 07, 2026 9:51 am

Theoretical Power Equation:

$P_{\text{kW}} = \frac{Q \times \Delta p}{600}$

P(kw) = power in kilowatt
Q = flow rate per minutes
dP = pressure drop in bar

Actual power with efficiency

$P_{\text{act}} = \frac{Q \times \Delta p \times \eta_t}{600}$

P_act = actual power
n = efficiency, Total motor efficiency (combined mechanical and volumetric) – typically 0.85 to 0.95 (e.g., 0.9 for 90%)

Post by **amh** » Sat Feb 07, 2026 10:33 am

$Q_{\mathrm{th}} = \frac{V_d \times rpm}{1000}$

Q = theoretical flow rate (L/min)
Vd = pump displacement (cm^3/rev)
rpm = pump speed rpm (rev/min)

Post by **amh** » Sat Feb 07, 2026 10:46 am

Pump displacement, $V_d$ is the volume of fluid delivered per one shaft revolution

Hydraulic Motor Calculation

Hydraulic Motor Calculation

Flow rate calculation

Hydraulic pump displacement