1. What is the Torque Constant?

The torque constant (Kt) of a BLDC motor relates the current flowing through the motor to the torque produced. It's a key parameter in motor performance analysis and control system design.

2. How Does the Calculator Work?

The calculator uses the torque constant equation:

Where:

• \( Kt \) — Torque constant (Nm/A)
• \( Torque \) — Motor output torque (Nm)
• \( Current \) — Phase current (A)

Explanation: The torque constant represents how much torque the motor produces per ampere of current. Higher Kt means more torque per amp.

3. Importance of Torque Constant

Details: The torque constant is crucial for motor selection, performance prediction, and control system design. It helps determine how much current is needed to achieve desired torque.

4. Using the Calculator

Tips: Enter torque in Newton-meters (Nm) and current in amperes (A). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical Kt values for BLDC motors?
A: Kt values typically range from 0.01 to 1.0 Nm/A depending on motor size and design.

Q2: How is Kt related to back-EMF constant (Ke)?
A: In SI units, Kt = Ke when both are properly defined. They represent the same physical relationship.

Q3: Does Kt vary with current?
A: Ideally Kt is constant, but in practice it may vary slightly due to magnetic saturation at high currents.

Q4: How do I measure torque for this calculation?
A: Use a torque sensor or calculate from known load conditions. Ensure measurements are at steady state.

Q5: Why is Kt important for motor control?
A: Kt is essential for current-to-torque conversion in field-oriented control and torque control loops.