1. What is the Electric Motor Torque Formula?

The Electric Motor Torque Formula calculates the torque produced by an electric motor based on its power output and rotational speed. This formula is essential for motor selection, performance analysis, and mechanical design applications.

2. How Does the Calculator Work?

The calculator uses the electric motor torque formula:

Where:

• \( T \) — Torque (lb-ft)
• \( P \) — Power (hp)
• \( RPM \) — Rotational speed (rev/min)
• 5252 — Conversion constant

Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM in the imperial system, where 1 horsepower equals 550 foot-pounds per second.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for selecting appropriate motors for specific applications, ensuring mechanical systems operate efficiently, and preventing motor overload or underutilization.

4. Using the Calculator

Tips: Enter power in horsepower (hp) and rotational speed in revolutions per minute (RPM). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between horsepower and foot-pounds per minute, where 1 hp = 33,000 ft-lb/min and 5252 = 33,000 ÷ (2π).

Q2: What are typical torque values for electric motors?
A: Torque values vary widely depending on motor size and type, ranging from less than 1 lb-ft for small motors to several hundred lb-ft for large industrial motors.

Q3: Can this formula be used for AC and DC motors?
A: Yes, this formula applies to both AC and DC electric motors when using imperial units, though motor efficiency and power factor should be considered for accurate results.

Q4: How does torque relate to motor performance?
A: Torque determines a motor's ability to overcome load resistance. Higher torque allows motors to start under heavy loads and maintain operation under varying conditions.

Q5: What are the limitations of this formula?
A: This formula provides theoretical torque and doesn't account for motor efficiency, power factor, or speed-torque characteristics that vary with motor type and load conditions.