Finding the Perfect Fit: Determining Displacement for Hydraulic Motors

To determine the right displacement for your hydraulic motor, you need to consider several factors that relate to the specific application and performance requirements. 

Here’s a step-by-step guide:

1. Understand Displacement

Displacement refers to the volume of hydraulic fluid displaced by the motor in one complete revolution. It's typically expressed in cubic centimetres (cc) or cubic inches (in³).

2. Gather Required Parameters

• Torque (T): Determine the torque required for your application. This can be specified in Newton-meters (Nm) or pound-feet (lb-ft).
• Operating Pressure (P): Identify the maximum operating pressure of your hydraulic system, typically measured in bar or psi.

3. Use the Formula

The relationship between torque, pressure, and displacement can be expressed with the following formula:

• T = Torque (in Nm)
• PPP = Pressure (in bar) × 100,000 (to convert to pascals)
• DDD = Displacement (in m³/rev) or (in cc/rev)

Rearranging the formula to solve for displacement gives you:

4. Calculate Displacement

Plug the values for torque and pressure into the formula to find the required displacement.

5. Consider Motor Speed

Also consider the speed at which the motor will operate. Higher displacement motors can deliver more torque at lower speeds, while lower displacement motors are better suited for higher speeds.

6. Check Manufacturer Specifications

Review the technical specifications provided by motor manufacturers to ensure the selected displacement aligns with your application requirements.

7. Consult with Experts

If you are unsure, consulting with hydraulic system experts or manufacturers can help you select the right displacement based on your specific application needs.

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Contact us today to speak with one of our hydraulic specialists and explore your options. You can also shop for hydraulic motors directly through our website.