Selection Of DC Motor Characteristic Types

(1) For production machinery with constant torque (TL is constant, regardless of speed), a motor with hard characteristics should be selected, such as metal processing, lifting machinery, etc.

(2) Ventilation mechanical load, the mechanical load TL is proportional to the square of the speed n. This type of machinery should also be driven by a motor with hard characteristics.

(3) For constant power load (when P is constant, T and n are inversely proportional), it is necessary to select a soft-characteristic motor to drive. Such as: electric locomotives, etc.