How To Calculate Maximum Torque Of A Motor

Maximum Torque Formula:

\[ T_{max} = \frac{P_{max} \times 9550}{N_{stall}} \]

Maximum Torque (T_max):

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1. What is Maximum Torque of a Motor?

Maximum torque (T_max) is the highest rotational force a motor can produce, typically occurring at stall speed. It's a critical parameter for understanding a motor's performance capabilities, especially in applications requiring high starting torque or overcoming heavy loads.

2. How Does the Calculator Work?

The calculator uses the maximum torque formula:

\[ T_{max} = \frac{P_{max} \times 9550}{N_{stall}} \]

Where:

\( T_{max} \) — Maximum torque (Nm)
\( P_{max} \) — Maximum power (kW)
\( N_{stall} \) — Stall speed (rpm)
9550 — Conversion constant (derived from 60,000/2π)

Explanation: The formula calculates the maximum torque a motor can produce based on its maximum power output and the speed at which it stalls (zero speed under maximum load).

3. Importance of Maximum Torque Calculation

Details: Calculating maximum torque is essential for motor selection, ensuring the motor can handle peak load requirements, preventing stalling, and optimizing performance in various applications from industrial machinery to automotive systems.

4. Using the Calculator

Tips: Enter maximum power in kilowatts (kW) and stall speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is stall speed in a motor?
A: Stall speed is the rotational speed at which the motor produces maximum torque but cannot rotate (zero RPM) due to excessive load.

Q2: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from the conversion between power (kW), torque (Nm), and speed (RPM): 60,000/(2π) ≈ 9550.

Q3: How does maximum torque differ from rated torque?
A: Maximum torque is the peak torque a motor can produce briefly, while rated torque is the continuous torque the motor can handle without overheating.

Q4: Can this formula be used for all types of motors?
A: This formula is generally applicable to electric motors, but specific motor types (induction, DC, synchronous) may have different torque characteristics.

Q5: What factors affect a motor's maximum torque?
A: Maximum torque is influenced by motor design, magnetic properties, current capacity, cooling system, and electrical characteristics.