1. What is the Hydraulic Motor RPM Equation?

The hydraulic motor RPM equation calculates the rotational speed of a hydraulic motor based on the flow rate of hydraulic fluid and the motor's displacement. It's essential for designing and troubleshooting hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the hydraulic motor RPM equation:

Where:

• \( N \) — Motor speed in revolutions per minute (RPM)
• \( Q \) — Flow rate in gallons per minute (GPM)
• \( D \) — Motor displacement in cubic inches per revolution (in³/rev)
• 231 — Conversion factor (cubic inches per gallon)

Explanation: The equation converts flow rate into motor rotation speed based on the motor's displacement volume.

3. Importance of RPM Calculation

Details: Accurate RPM calculation is crucial for proper system design, ensuring motors operate within their rated speed range and achieve desired machine performance.

4. Using the Calculator

Tips: Enter flow rate in GPM and motor displacement in in³/rev. Both values must be positive numbers. The calculator will compute the motor speed in RPM.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 is the conversion factor between gallons and cubic inches (1 gallon = 231 cubic inches).

Q2: What are typical RPM ranges for hydraulic motors?
A: Most hydraulic motors operate between 500-5000 RPM, but always consult manufacturer specifications.

Q3: How does motor efficiency affect actual RPM?
A: This formula gives theoretical RPM. Actual RPM may be slightly lower due to volumetric efficiency losses.

Q4: Can I use this for hydraulic pumps too?
A: Yes, the same formula applies to calculate pump speed from flow and displacement.

Q5: What if my motor displacement is in cc/rev?
A: Convert cc to in³ first (1 in³ = 16.387 cc) or use the metric version of the formula.