What type of torque increase do variable-torque motors provide?

Variable-torque motors exhibit a specific characteristic where the torque output varies based on the motor's speed. As the speed of the motor increases, the torque also increases, making it particularly advantageous for applications where the load demand decreases as the speed increases, such as in centrifugal pumps and fans. This relationship is fundamental to the operation of variable-torque applications, as it allows the motor to match its performance with the requirements of the load.

In contrast, other types of torque characteristics, such as constant torque or decreasing torque with speed, do not apply to variable-torque motors. Constant torque motors maintain the same torque regardless of speed, which is ideal for applications needing consistent torque across a range of speeds. Conversely, a decrease in torque with speed would not be suitable for variable-torque conditions, as that would not address the necessary torque performance as loads change with varying speeds.