What is a torque?

What is the difference between motor torque and load torque?

• difference between motor torque and load torque

• Answer:

  “Motor torque” can refer to the torque that a motor produces under some given operating conditions or the torque that that the motor is capable of producing under given operating conditions. Most electric motors are designed to operate continuously without failure under specified operating conditions over a certain lifetime while producing a certain maximum torque called “rated torque” at a certain speed called “rated speed.” Rated motor power is rated torque multiplied by rated speed. An additional multiplier may be required depending on the units of measurement. “Load torque” is the torque required to turn the input shaft of a load at a given speed and given operating conditions. When the motor is started, it must produce more torque than the load requires in order to accelerate the load. As the motor approaches the normal operating speed, its torque capability declines. When the motor reaches a speed at which its torque capability matches the torque requirement of the load, it stops accelerating and operates at a steady speed. If the motor is properly sized for the load, the point where the motor torque equals the load torque is less than or equal to the rated torque of the motor and the speed is the desired operating speed.