1. What is Motor Torque?

Torque is the rotational force produced by an electric motor. It's a crucial parameter for determining a motor's ability to perform work and is typically measured in Newton-meters (Nm).

2. How Does the Calculator Work?

The calculator uses the 3-phase motor torque equation:

Where:

• Current — Motor current in Amperes (A)
• Voltage — Supply voltage in Volts (V)
• Efficiency — Motor efficiency (0-1)
• RPM — Motor speed in revolutions per minute
• Power Factor — Ratio of real power to apparent power (0-1)
• 9550 — Conversion constant

Explanation: The equation calculates torque based on electrical input power and motor speed, accounting for efficiency and power factor.

3. Importance of Torque Calculation

Details: Knowing motor torque is essential for selecting the right motor for an application, ensuring proper starting capability, and preventing overload conditions.

4. Using the Calculator

Tips: Enter current in amps, voltage in volts, efficiency (typically 0.7-0.95), RPM, and power factor (typically 0.8-0.95). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between starting torque and running torque?
A: Starting torque is the torque produced at zero speed, typically higher than running torque which is produced at operating speed.

Q2: How does voltage affect torque?
A: Torque is proportional to the square of voltage. A 10% voltage drop results in about 19% torque reduction.

Q3: What is typical power factor for motors?
A: Typically 0.8-0.95 for efficient motors at full load, lower at partial loads.

Q4: Why is efficiency important in torque calculation?
A: Efficiency accounts for energy losses (heat, friction) that reduce the mechanical power output from electrical input.

Q5: Can this calculator be used for single-phase motors?
A: No, this equation is specifically for 3-phase motors. Single-phase motors require a different calculation.