BLDC Motor Torque Calculator

Torque Equation:

\[ T = \frac{P \times 9550}{N} \]

Torque (T):

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1. What is BLDC Motor Torque?

Torque in a BLDC (Brushless DC) motor is the rotational force produced by the motor. It's a crucial parameter that determines the motor's ability to perform work and overcome load resistance.

2. How Does the Calculator Work?

The calculator uses the torque equation:

\[ T = \frac{P \times 9550}{N} \]

Where:

\( T \) — Torque in Newton-meters (Nm)
\( P \) — Power in kilowatts (kW)
\( N \) — Speed in revolutions per minute (RPM)
9550 — Conversion factor combining unit conversions and constants

Explanation: The equation shows that torque is directly proportional to power and inversely proportional to speed. The constant 9550 comes from unit conversions (kW to W, RPM to rad/s) and mathematical constants.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for motor selection, system design, and ensuring the motor can handle the required mechanical load without stalling or overheating.

4. Using the Calculator

Tips: Enter power in kW and speed in RPM. Both values must be positive numbers. The calculator will compute the torque in Nm.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: It combines the conversion factors for kW to W (1000), minutes to seconds (60), and radians to revolutions (2π) into one constant (60000/2π ≈ 9550).

Q2: What are typical torque values for BLDC motors?
A: Torque varies widely depending on motor size and application, from fractional Nm for small motors to hundreds of Nm for large industrial motors.

Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to accelerate loads and overcome resistance. Higher torque means better ability to handle heavy loads.

Q4: What affects BLDC motor torque?
A: Torque depends on current, number of windings, magnetic flux, and motor design. It's directly proportional to current in the operating range.

Q5: How is this different from stall torque?
A: This calculates operating torque at a given speed and power. Stall torque is the maximum torque at zero speed, typically higher than operating torque.