Brushless dc gear motor controller refers to the cooling process of energy conversion, there is always a small part of the loss into heat, it must be through the motor shell and the surrounding medium heat out ceaselessly, the heat of the process, then it will appear along with equipment cooling medium: : 1, secondary cooling medium temperature is lower than the primary cooling medium of gas or liquid medium, through the outer surface of the brushless dc gear motor controller or cooler will be released by the primary coolant heat away. : 2, the primary cooling medium temperature is lower than a portion of the brushless dc gear motor controller of gas or liquid medium, brushless dc gear motor and controller of the part in contact, and gives off heat away. 3, around the cooling medium: brushless dc gear motor controller surrounding gas or liquid medium. Everybody simple understanding of the knowledge of brushless dc gear motor controller, it will not only help in understanding, so will also help in use.