1. What is the Hydraulic Motor Speed Equation?

The hydraulic motor speed equation calculates the rotational speed (in RPM) of a hydraulic motor based on the flow rate of hydraulic fluid and the motor's displacement. This is essential for designing and troubleshooting hydraulic systems in trucks.

2. How Does the Calculator Work?

The calculator uses the hydraulic motor speed equation:

Where:

• \( N \) — Motor speed (RPM)
• \( Q \) — Flow rate (GPM)
• \( D \) — Motor displacement (in³/rev)
• 231 — Conversion constant (cubic inches per gallon)

Explanation: The equation shows that motor speed is directly proportional to flow rate and inversely proportional to displacement.

3. Importance of Motor Speed Calculation

Details: Accurate motor speed calculation is crucial for proper hydraulic system design, ensuring optimal performance and preventing damage from excessive speeds.

4. Using the Calculator

Tips: Enter flow rate in gallons per minute (GPM) and motor displacement in cubic inches per revolution (in³/rev). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 231 used?
A: 231 is the number of cubic inches in a US gallon, which converts flow rate (GPM) to cubic inches per minute.

Q2: What are typical hydraulic motor speeds for trucks?
A: Most truck hydraulic motors operate between 500-3000 RPM, but always consult manufacturer specifications.

Q3: How does motor displacement affect speed?
A: Larger displacement motors turn slower at the same flow rate, while smaller displacement motors turn faster.

Q4: Can this be used for hydraulic pumps too?
A: Yes, the same equation applies to hydraulic pumps when calculating input speed requirements.

Q5: What if my motor has metric specifications?
A: Convert metric units first (1 GPM ≈ 3.785 L/min, 1 in³ ≈ 16.387 cm³) or use the metric version of the formula.