1. What is the Hydraulic Pump Motor Size Formula?

The hydraulic pump motor size formula calculates the required horsepower for a motor driving a hydraulic pump based on flow rate, system pressure, and pump efficiency. This ensures the motor is properly sized for the hydraulic system's demands.

2. How Does the Calculator Work?

The calculator uses the hydraulic power formula:

Where:

• \( Flow\ Rate \) — Pump flow rate in gallons per minute (GPM)
• \( Pressure \) — System pressure in pounds per square inch (PSI)
• \( Efficiency \) — Pump mechanical efficiency (decimal 0-1)
• 1714 — Conversion factor for GPM, PSI to HP

Explanation: The formula converts hydraulic power (flow × pressure) to mechanical power (horsepower) while accounting for pump efficiency losses.

3. Importance of Proper Motor Sizing

Details: Correct motor sizing prevents underpowered operation (which can cause motor failure) and avoids oversizing (which increases costs and reduces efficiency). Proper sizing ensures optimal system performance and longevity.

4. Using the Calculator

Tips: Enter flow rate in GPM, pressure in PSI, and pump efficiency as a decimal (typically 0.8-0.95 for most pumps). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical efficiency value for hydraulic pumps?
A: Gear pumps typically have 0.8-0.85 efficiency, vane pumps 0.82-0.90, and piston pumps 0.90-0.95.

Q2: Why is 1714 the conversion factor?
A: It converts (GPM × PSI) to horsepower (1 HP = 1714 GPM·PSI) based on the definition of horsepower.

Q3: Should I add a safety factor to the calculated power?
A: Yes, it's common practice to add 10-25% to the calculated power to account for system variations and future demands.

Q4: Can this be used for electric motor sizing?
A: Yes, but you may need to consider motor efficiency and service factor when selecting an electric motor.

Q5: What if my pressure is in bar?
A: Convert bar to PSI first (1 bar = 14.5038 PSI) before using the calculator.