1. What is a Hydraulic Motor Speed Calculator?

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

Purpose: It helps hydraulic system designers and technicians calculate motor speed for proper system operation and performance evaluation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The flow rate is converted to cubic inches per minute, then divided by the motor displacement to determine revolutions per minute.

3. Importance of Hydraulic Motor Speed Calculation

Details: Accurate RPM calculation ensures proper motor operation, prevents overspeeding, and helps match motor performance to application requirements.

4. Using the Calculator

Tips: Enter the hydraulic flow rate in GPM and motor displacement in cubic inches per revolution. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 cubic inches equals 1 gallon, converting GPM to cubic inches per minute for consistent units.

Q2: What's a typical displacement for hydraulic motors?
A: Displacement varies widely (0.1 to 100+ in³/rev) depending on motor size and application.

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

Q4: How do I find motor displacement?
A: Check motor specifications or nameplate, or calculate from motor geometry if known.

Q5: What if my motor has variable displacement?
A: Use the current displacement setting or minimum displacement for maximum speed calculation.