It is normal for a DC motor to heat up during use, but it has a certain range of control. Some users feel that there is a problem when they find it hot. In fact, we can understand the cause of the heat from several aspects.
It is normal for the DC motor to heat up to 70-90°C. As long as it is less than 130°C, there is generally no problem. If it really feels overheated, set the current of the commutator to about 70% of the rated current of the motor or reduce the speed of the motor. When there is no fault, it will also heat up under normal circumstances. Of course, the normal heating temperature will not be too high.
Reasons for the normal heating of the DC motor:
1. The coil has resistance, and the current flows through the power loss;
2. The magnetic field of the iron core has a "hysteresis loop", and part of the magnetic energy converted from electrical energy continues to be converted into heat energy;
3. There are eddy currents in the iron core, and part of the magnetic energy converted from electrical energy turns into electric current and then into heat energy;
4. There is friction between mechanical rotating parts, and part of the kinetic energy of electrical energy conversion continues to be converted into heat energy.
Knowing the cause of the heating of the DC motor, we can control it reasonably. If the temperature exceeds the normal range, stop work in time, make corresponding inspections, and deal with it.