1. What is the BLDC Motor Torque Equation?

The BLDC (Brushless DC) motor torque equation relates the torque produced by the motor to its torque constant and the current flowing through it. This fundamental relationship helps in motor selection and performance analysis.

2. How Does the Calculator Work?

The calculator uses the BLDC motor torque equation:

Where:

• \( \tau \) — Torque produced (Nm)
• \( K_t \) — Torque constant (Nm/A)
• \( I \) — Current flowing through motor (A)

Explanation: The torque constant (Kt) is a motor-specific parameter that indicates how much torque the motor produces per ampere of current.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for selecting the right motor for an application, determining mechanical power output, and ensuring the motor can handle the required load.

4. Using the Calculator

Tips: Enter the torque constant (Kt) in Nm/A and the current in amperes. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find the Kt value for my motor?
A: The torque constant is typically provided in the motor's datasheet. It may also be listed as "torque sensitivity" or "motor constant."

Q2: Is this equation valid for all operating conditions?
A: This equation works well under normal operating conditions but may need adjustment for very high currents or temperatures.

Q3: How does torque relate to motor power?
A: Mechanical power is torque multiplied by angular velocity (P = τ × ω). Higher torque at a given speed means more power.

Q4: What's the difference between Kt and Kv?
A: Kt is the torque constant (Nm/A), while Kv is the voltage constant (rpm/V). In SI units, they are inversely related (Kt ≈ 9.5493/Kv when Kv is in rpm/V).

Q5: Can I use this for other motor types?
A: This equation works for BLDC and permanent magnet DC motors. AC induction motors and stepper motors have different torque equations.