1. What is Induction Motor Torque?

Induction motor torque is the rotational force produced by an induction motor, measured in foot-pounds (ft-lb). It represents the motor's ability to perform work and overcome resistance to rotation.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque in foot-pounds (ft-lb)
• \( HP \) — Horsepower
• \( RPM \) — Rotations per minute
• \( 5252 \) — Conversion constant derived from the relationship between horsepower, torque, and RPM

Explanation: The constant 5252 comes from the conversion between horsepower and torque, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for motor selection, sizing mechanical systems, determining load capacity, and ensuring proper motor performance for specific applications.

4. Using the Calculator

Tips: Enter horsepower and RPM values. Both values must be positive numbers greater than zero. The calculator will compute the torque in foot-pounds.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 is derived from unit conversions where 1 HP = 550 ft-lb/sec and there are 60 seconds in a minute, plus the conversion from linear to rotational motion (2π radians per revolution).

Q2: What is typical torque range for induction motors?
A: Torque varies widely by motor size and design, ranging from a few foot-pounds for small motors to thousands of foot-pounds for large industrial motors.

Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to start under load, accelerate loads, and maintain operation under varying load conditions.

Q4: What factors affect induction motor torque?
A: Key factors include motor design, voltage supply, frequency, rotor resistance, and slip between rotor and stator magnetic fields.

Q5: When is maximum torque typically achieved?
A: Induction motors typically produce maximum torque at a specific slip value, usually between 80-90% of synchronous speed, known as breakdown torque.