1. What is a Hydraulic Motor Speed Calculator?

Definition: This calculator determines the rotational speed (RPM) of a hydraulic motor based on flow rate and motor displacement.

Purpose: It helps hydraulic system designers and technicians properly size and select motors for specific speed requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( RPM \) — Revolutions per minute
• \( Q \) — Flow rate (gallons per minute, gpm)
• \( D \) — Motor displacement (cubic inches per revolution, in³/rev)
• 231 — Conversion constant (cubic inches per gallon)

Explanation: The formula converts flow rate to motor speed considering the motor's displacement volume per revolution.

3. Importance of Hydraulic Motor Speed Calculation

Details: Proper speed calculation ensures motors operate within their designed range, prevents excessive wear, and maintains system efficiency.

4. Using the Calculator

Tips: Enter the hydraulic flow rate in gpm and motor displacement in in³/rev. Both values must be > 0.

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's a typical displacement for hydraulic motors?
A: Displacement varies widely from 0.1 in³/rev for small motors to over 100 in³/rev for large industrial motors.

Q3: Does this account for motor efficiency?
A: No, this is theoretical speed. Actual speed will be slightly lower due to volumetric efficiency losses.

Q4: How do I find my motor's displacement?
A: Check manufacturer specifications or motor model number - displacement is often included in the model.

Q5: What if I know the speed and need to find flow?
A: Rearrange the formula: \( Q = \frac{RPM \times D}{231} \)