1. What is Torque Calculation From Power Factor?

The torque calculation considering power factor provides a more accurate assessment of the actual torque produced by an electric motor, accounting for the phase difference between voltage and current in AC circuits.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

• \( Power \) — Mechanical power in horsepower (hp)
• \( RPM \) — Rotational speed in revolutions per minute
• \( Power\ Factor \) — Ratio of real power to apparent power (0 to 1)
• 5252 — Conversion factor between horsepower and lb-ft/min

Explanation: The equation accounts for the relationship between power, speed, and the efficiency of power transfer in AC systems.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for motor selection, mechanical system design, and ensuring proper operation of driven equipment.

4. Using the Calculator

Tips: Enter power in horsepower, RPM in revolutions per minute, and power factor as a decimal between 0 and 1. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why include power factor in torque calculation?
A: Power factor accounts for the phase difference in AC circuits, providing the true torque output rather than just apparent torque.

Q2: What is a typical power factor value?
A: For AC induction motors, power factor typically ranges from 0.85 to 0.95 at full load, but can be much lower at light loads.

Q3: How does power factor affect torque?
A: Lower power factor means more current is required to deliver the same real power, resulting in less efficient torque production.

Q4: Can this be used for DC motors?
A: For DC motors, set power factor to 1 since there's no phase difference between voltage and current.

Q5: What are common torque units?
A: This calculator provides results in lb-ft (pound-feet). For Nm (Newton-meters), multiply by 1.3558.