Brushless dc motor in the process of using heat belongs to the normal phenomenon, but a corresponding control. Some consumers find fever think it will be a problem, in fact, the cause of the fever we can from the following several aspects to understand. 1, the coil resistance, electric current flows through the consumed power, which generate heat; 2, the magnet has a 'loop' effect of magnetic field, the magnetic energy of power in a small number of again converted to heat energy; 3, magnet and eddy current, magnetic energy has a small part of the power and in turn into heat energy into current; 4, mechanical friction between moving parts, the kinetic energy of the power in a small part is converted into heat again. Motor magnetic field distribution of brushless dc motor heating - in 70Belong to the normal phenomenon between 90 ℃, the average temperature is less than 120 ℃ is no problem, if really think overheating, the circuit of the current set to about 70% of the rated current motor or motor rotation speed down a little bit. No fault, under normal circumstances will be hot. Of course, the normal heating temperature is too high. Understand the cause of the brushless dc motor heating, we can reasonable control. If the temperature is beyond the normal range, so should be in time to stop working, and makes the corresponding inspection work, and do the processing.