1. What is the Hydraulic Motor Torque Formula?

The hydraulic motor torque formula calculates the theoretical torque output of a hydraulic motor based on its displacement and the system pressure. This is essential for selecting the appropriate motor for a hydraulic system.

2. How Does the Calculator Work?

The calculator uses the hydraulic motor torque formula:

Where:

• \( T \) — Torque output (Nm)
• \( D \) — Motor displacement (cm³/rev)
• \( P \) — Pressure difference across motor (bar)
• \( \pi \) — Pi, approximately 3.14159

Explanation: The formula shows that torque is directly proportional to both displacement and pressure. The factor of 2π converts the units appropriately.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for ensuring the hydraulic motor can provide enough rotational force for the application without being oversized, which would waste energy and increase costs.

4. Using the Calculator

Tips: Enter the motor displacement in cm³/rev and system pressure in bar. Both values must be positive numbers. The calculator will output the theoretical torque in Newton-meters (Nm).

5. Frequently Asked Questions (FAQ)

Q1: Is this the actual torque I'll get from the motor?
A: This is theoretical torque. Actual torque will be slightly less due to mechanical efficiency losses (typically 85-95% of theoretical).

Q2: What if I know the required torque but need to find displacement?
A: Rearrange the formula: \( D = \frac{T \times 2 \times \pi}{P} \)

Q3: How does speed factor into this calculation?
A: Speed is determined by flow rate (Q) and displacement: \( N = \frac{Q \times 1000}{D} \) rpm (where Q is in L/min)

Q4: What's a typical pressure range for hydraulic motors?
A: Most hydraulic systems operate between 150-350 bar, but some high-pressure systems go up to 700 bar.

Q5: How do I account for efficiency?
A: Multiply the theoretical torque by the motor's mechanical efficiency (typically 0.85-0.95) to get actual torque.