Is there a problem with the heating of the DC motor?

Update:25 Jan 2021
Summary:

It is normal for DC motors to generate heat during use, […]

It is normal for DC motors to generate heat during use, but they have a certain control range. Some users feel if there is a problem when they find fever. In fact, we can understand the cause of the fever from several aspects.

It is normal for a DC motor to heat up to 70-90°C. As long as it is less than 130°C, there is generally no problem. If you really feel overheated, set the drive current to about 70% of the motor's rated current or reduce the motor speed. 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 normal heating of 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 transformed by electric energy continues to be transformed into heat energy;

3. There are eddy currents in the iron core, part of the magnetic energy transformed by electric energy turns into electric current and then into heat energy;

4. There is friction between mechanical rotating parts, and part of the kinetic energy converted from electrical energy continues to be converted into thermal energy.

Knowing the cause of the heating of the DC motor, we can reasonably control it. If the temperature is out of the normal range, stop work in time, make corresponding inspections, and deal with it.

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