Hydraulic Pump Motor Sizing

Motor size vs. flow rate, shaft torque, shaft power and hydraulic power.

Hydraulic Pump Motor Sizing

Calculate flow rate, shaft torque, shaft power, and hydraulic power based on pump displacement, pressure, and rotational speed.

Equations

Flow Rate:

  • Q = D × n / 1000
  • Q = flow rate (l/min), D = displacement (cm³/rev), n = revolutions (rpm)

Shaft Torque:

  • T = D × p / (20 × π)
  • T = torque (Nm), p = pressure (bar)

Shaft Power:

  • P_s = T × n / 9554
  • P_s = shaft power (kW)

Hydraulic Power:

  • P_h = Q × p / 600
  • P_h = hydraulic power (kW)
Calculator

Inputs

Results

Flow Rate-- l/min
Shaft Torque-- Nm
Shaft Power-- kW
Hydraulic Power-- kW