Motor Torque and Power Calculation Formula
The power calculation formula for the motor: P=T*N/9549
where P is the power, measured in kilowatts (kW);
T represents torque, commonly referred to as the moment, with the unit of Newton-meters (N·m); N denotes motor speed, measured in revolutions per minute (r/min);
9549 is a constant. For the derivation of the formula, please refer to the following calculation process.
1. Memorize the formula forms of torque and power
The relationship between torque, power, and rotational speed is generally used to describe the work output of a motor's rotating shaft. Greater torque results in higher shaft power; higher rotational speed also leads to increased shaft power. Both torque and rotational speed are essential conditions for generating shaft power. If either torque or rotational speed is zero, the output shaft power will be zero. Therefore, motor no-load operation or stalling are two special cases where shaft power equals zero.