Electric Motor HP To Torque Calculator

Torque Formula:

\[ Torque (lb·ft) = \frac{HP \times 5252}{RPM} \]

Torque:

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1. What is the HP to Torque Formula?

The horsepower to torque formula calculates the rotational force (torque) produced by an electric motor based on its horsepower and rotational speed (RPM). This relationship is fundamental in understanding motor performance and selecting appropriate motors for specific applications.

2. How Does the Calculator Work?

The calculator uses the torque formula:

\[ Torque (lb·ft) = \frac{HP \times 5252}{RPM} \]

Where:

\( HP \) — Horsepower rating of the motor
\( RPM \) — Rotational speed in revolutions per minute
\( 5252 \) — Conversion constant derived from the relationship between horsepower, torque, and RPM

Explanation: The constant 5252 comes from the fact that 1 horsepower is defined as 550 foot-pounds per second, and there are 2π radians in one revolution.

3. Importance of Torque Calculation

Details: Torque calculation is essential for determining a motor's ability to perform work, especially in applications requiring high starting torque or operation under load. It helps in proper motor selection for industrial equipment, vehicles, and various mechanical systems.

4. Using the Calculator

Tips: Enter the motor's horsepower rating and operating RPM. Both values must be positive numbers (HP > 0, RPM > 0). The calculator will compute the torque output in pound-feet (lb·ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is there a constant 5252 in the formula?
A: The constant 5252 comes from the conversion between horsepower (550 ft-lb/sec) and RPM (2π radians per revolution × 60 seconds per minute ÷ 2π).

Q2: Can I use this calculator for all types of motors?
A: This formula works for electric motors, but may need adjustment for other motor types that have different efficiency characteristics or torque curves.

Q3: What is the relationship between torque and RPM?
A: For a given horsepower, torque decreases as RPM increases. This is why high-torque applications often use gear reduction systems.

Q4: How does motor efficiency affect torque calculation?
A: This formula calculates theoretical torque. Actual torque may be lower due to efficiency losses, which vary by motor type and design.

Q5: Can I calculate horsepower if I know torque and RPM?
A: Yes, you can rearrange the formula: \( HP = \frac{Torque \times RPM}{5252} \)