Motor Driven Load
Constant Torque Loads
In this load characteristic, the torque is constant across the entire speed range. The power is therefore directly proportional to the speed and therefore, reducing the speed will also reduce the power required in a linear fashion.
Variable Torque Loads
Also called quadratic torque loads, the torque of the load is proportional to the square of the speed. The load power is therefore proportional to the cube of the speed.
e.g. centrifugal pumps, fans and blowers
Constant Power Loads
In this load characteristic, the power output of the load is constant across the entire speed range, and therefore torque requirements are high at low speeds.
Constant Torque / Power
This load characteristic is a combination of constant torque in one speed range and constant power in another. e.g. paper making machines
High Starting Torque - Constant Torque
This load characteristic has high torque at starting and low speeds, followed by constant torque at higher speeds.