Enter the flow rate, pressure, and efficiency into the calculator to determine the required motor size in horsepower (HP), or enter the motor size, flow rate, pressure, and efficiency to calculate any of the other variables.

Hydraulic Pump Motor Sizing Formula

The following formula is used to calculate the hydraulic pump motor size for a hydraulic system:

 Motor Size = (Flow Rate * P) / (E * 1714)

Variables:

  • Motor Size is the required motor size in horsepower (HP)
  • Flow Rate is the desired flow rate of the hydraulic system in gallons per minute (GPM)
  • Pressure is the desired pressure of the hydraulic system in pounds per square inch (PSI)
  • Efficiency is the efficiency of the hydraulic pump as a decimal (e.g., 0.85 for 85% efficiency)

To calculate the required motor size, multiply the flow rate by the pressure, then divide the result by the product of the efficiency and 1714. The result will be the required motor size in horsepower (HP).

What is a Hydraulic Pump Motor Sizing?

Hydraulic pump motor sizing refers to the process of determining the appropriate size and power of a hydraulic pump motor for a specific application. This process is crucial because the size and power of the motor directly affect the performance and efficiency of the hydraulic system. The sizing process involves several factors including the required pressure, flow rate, and load of the system. The pressure is determined by the force needed to perform the task, while the flow rate is determined by the speed at which the task needs to be performed. The load refers to the resistance that the hydraulic system needs to overcome to perform the task. By considering these factors, one can determine the appropriate size and power of the hydraulic pump motor, ensuring that the system operates efficiently and effectively.

How to Calculate Hydraulic Pump Motor Sizing?

The following steps outline how to calculate the Hydraulic Pump Motor Sizing.

  1. First, determine the flow rate required (Q) in gallons per minute (GPM).
  2. Next, determine the pressure required (P) in pounds per square inch (PSI).
  3. Next, gather the formula from above = Motor Power (HP) = (Q x P) / 1714.
  4. Finally, calculate the Hydraulic Pump Motor Sizing.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Flow rate required (Q) = 50 GPM

Pressure required (P) = 2000 PSI