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Torque Formula:
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Motor torque calculation determines the rotational force produced by an electric motor based on its power output and rotational speed. Torque is a crucial parameter in motor selection and mechanical system design.
The calculator uses the torque formula:
Where:
Explanation: The constant 9550 is derived from unit conversion factors to calculate torque in Newton-meters from power in kilowatts and speed in revolutions per minute.
Details: Accurate torque calculation is essential for proper motor sizing, ensuring adequate starting and running torque for specific applications, and preventing motor overload or underperformance.
Tips: Enter power in kilowatts (kW) and rotational speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero for accurate calculation.
Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from unit conversion: 60,000/(2π) ≈ 9550, which converts power from kW to Nm×rpm.
Q2: What is a typical torque range for electric motors?
A: Torque varies significantly based on motor type and size, ranging from fractional Nm for small motors to thousands of Nm for large industrial motors.
Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to overcome load resistance. Higher torque means better starting capability and ability to handle heavier loads.
Q4: Can this formula be used for all motor types?
A: This formula provides theoretical torque for ideal conditions. Actual torque may vary based on motor efficiency, design, and operating conditions.
Q5: How does speed affect torque in electric motors?
A: For a given power, torque decreases as speed increases. This is why high-torque applications often use gear reducers to lower output speed while increasing torque.