1. What is a Hydraulic Motor Flow Calculator?

Definition: This calculator estimates the flow rate required for a hydraulic motor based on its speed and displacement.

Purpose: It helps hydraulic system designers and technicians determine the proper flow rate to achieve desired motor speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute, GPM)
• \( RPM \) — Motor speed (revolutions per minute)
• \( D_m \) — Motor displacement (cubic inches per revolution)
• 231 — Conversion factor (cubic inches per gallon)

Explanation: The motor speed multiplied by displacement gives the required volume per minute, which is then converted to gallons.

3. Importance of Flow Rate Calculation

Details: Proper flow rate estimation ensures the hydraulic motor operates at the desired speed without cavitation or excessive pressure drops.

4. Using the Calculator

Tips: Enter the motor speed in RPM and displacement in cubic inches per revolution. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 cubic inches equals 1 US gallon, which converts the volume measurement to gallons per minute.

Q2: What's a typical displacement for hydraulic motors?
A: Displacement varies widely, from small motors (0.1 in³/rev) to large ones (100+ in³/rev), depending on application.

Q3: Does this account for motor efficiency?
A: No, this is theoretical flow. Actual flow should include volumetric efficiency (typically 85-95% for good motors).

Q4: How does pressure affect this calculation?
A: Pressure doesn't directly affect flow rate calculation but determines the required pump power.

Q5: Can I use this for hydraulic pumps too?
A: Yes, the same formula works for pump flow rate calculations.