Hydraulic Motor Calculations

GPM of Flow Needed for Given Fluid Motor Speed

Motor Displacement (Cubic Inches per Revolution)

What is the displacement of the hydraulic motor?

In^3

Motor RPM

What is the RPM of the hydraulic motor

RPM

(Motor Displacement x Motor RPM) / 231 = Flow Required (GPM)

GPM

Fluid Motor Speed (RPM) from given GPM Input

Gallons per Minute (GPM)

What is the amount of flow (GPM) supplying the hydraulic motor?

GPM

Hydraulic Motor Displacement (Cubic Inches)

What is the displacement of the hydraulic motor?

In^3

231 x GPM / Motor Displacement = RPM

RPM

Fluid Motor Torque from Pressure (PSI) and Displacement (Cubic Inches)

Pressure (PSI)

What is the amount of pressure going to fluid motor?

PSI

Hydraulic Motor Displacement (Cubic Inches)

What is the displacement of the hydraulic motor?

In^3

PSI x Motor Displacement / (2*π) = Torque in Inch Pounds

in-lbs

Fluid Motor Torque from Horsepower and RPM

Horsepower

What is the horsepower of the motor?

HP

Motor RPM

What is the RPM of the the motor?

RPM

Horsepower x 63024 / RPM = Torque in Inch Pounds

in-lbs

Fluid Motor Torque from Flow (GPM), Pressure (PSI), and Speed (RPM)

Gallons per Minute

What is the input flow of the fluid motor?

GPM

Pressure (PSI)

What is the pressure supplying the motor?

PSI

Motor RPM

How fast is the fluid motor turning? (RPM)

RPM

GPM x PSI x 36.77 / RPM = Output Torque in Inch Pounds

in-lbs