Brushless DC motor is a kind of electromechanical equipment commonly used at present. The device consists of a motor and a driver. The stator windings of the motor are mostly made into a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. The magnetized permanent magnet is glued to the motor rotor. In order to detect the rotor of the motor, a position sensor driver is installed in the motor, which is composed of power electronics and integrated circuits. So is the transformer loss of a brushless DC motor related to temperature?
There are core loss, winding loss and additional loss in the operation of the DC brushless motor transformer. On the one hand, these losses reduce the efficiency of the transformer, on the other hand, they are converted into heat, thereby increasing the temperature of the relevant parts of the transformer. Due to the temperature difference between each part of the transformer and the surrounding medium, the heat is dissipated into the surrounding medium.
When the heat generated is equal to the heat dissipation, the temperature of each part of the transformer reaches a stable value. At this time, the difference between the temperature of a certain part of the transformer and the temperature of the surrounding cooling medium is called the temperature rise of this part.
The time for a brushless DC motor transformer to reach a stable temperature rise varies depending on the transformer capacity and cooling mode. Small-capacity oil-immersed and dry-type transformers can be considered to reach a stable temperature rise after 10 hours of operation. It takes about 24 hours for a large transformer to reach a stable temperature rise.
Generally speaking, the heat dissipation process of the DC brushless motor transformer is as follows: First, the heat inside the winding and the iron core is transferred to the surface through conduction. Then the heat is continuously carried to the tank wall and the tubing wall through the natural convection of the transformer oil, and then transferred from their inner surface to their outer surface through the conduction effect of the tank wall and the tubing wall, and then dissipated to their outer surface by radiation and convection. In the surrounding air.
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