The water-cooled (liquid-cooled) variable-frequency control system is a type of variable-frequency control system that uses pure water or coolant as the heat-transfer medium. The entire system employs an internal-external closed-loop heat-exchange technology, which isolates and exchanges heat between the industrial cooling water from the external environment and the coolant inside the system. By leveraging the heat exchange between the two fluid circuits, the system effectively removes the heat generated during the operation of the variable-frequency drive. This system features a compact structure, high power density, immunity to external environmental influences, flexible operation, and stable performance.