High-pressure motor air-air cooler
Product Overview
High-voltage motors utilize a totally enclosed air-air cooled motor, cooled by the internal air (motor hot air) passing through the heat exchanger (air-air cooler). The air-air cooler itself is cooled by external cooling air flowing through the heat exchanger (air-air cooler). The entire unit is composed of an air-air cooler and an external fan mounted on the motor shaft, or an air-air cooler and an axial flow fan. The air-air cooler is typically manufactured by professional manufacturers, and the motor design must determine the required heat exchange rate and temperature difference per unit time.
Working Principle
Three baffles are arranged inside the cooler to guide the airflow, with the middle baffle equidistant from both side baffles. The generator drives the internal airflow through the rotation of its rotor. The internal air exiting the motor flows radially into the cooler from bottom to top, splitting into two lateral paths across the tubes to the upper space of the cooler, then turns to flow downwards across the tubes laterally. The heat within the generator is thus transferred to the heat exchanger tubes through the internal airflow, which then transfers it to the external airflow. The cooled internal air from the motor exits the cooler radially from both sides and flows into the motor. The external air flows axially within the heat exchanger tubes, entering from one end and exiting from the other.
Due to the presence of radial and axial ventilation channels within the stator and rotor cores of large and medium-sized high-voltage motors, the ventilation methods within the motor can be categorized into two types based on the direction of air flow for internal cooling: radial ventilation and mixed ventilation. The mixed ventilation system is generally a series air path, characterized by long air paths, high air resistance, and significant pressure drop, necessitating the installation of a large-diameter fan at one end to increase the ventilation volume. This is the principle.
