The temperature rise is a very critical performance index of the motor. If the temperature rise performance is not good, the service life and operation reliability of the motor will be greatly reduced. Factors affecting the temperature rise of the motor, in addition to the selection of the design parameters of the motor itself, many factors in the manufacturing process will cause the temperature rise of the motor to not meet the requirements of safe operation of the motor.

To test the temperature rise of the motor, it is necessary to carry out the thermal stability temperature rise test of the motor, and it is impossible to find the problem of the temperature rise of the motor by a simple factory test. A large number of actual thermal stable temperature rise tests of motors show that: improper selection of fans and unsuitable thermal components have a great impact on temperature rise, but the problem of temperature rise caused by dipping factors is also often encountered, and the usual remedy is to re-dip Paint once.

In order to improve production efficiency, most of the small and medium-sized motors do not have a base dipping paint. In addition to the dipping and drying quality of the winding itself, the tightness of the iron core and the frame also directly affects the final temperature rise of the motor. Theoretically, the mating surface of the machine base and the iron core should be closely matched, but due to the deformation of the machine base and the iron core, etc., an air gap will appear between the two mating surfaces artificially, which is not conducive to the motor. Thermal insulation for heat dissipation. The use of dipping paint with a frame not only fills the air gap between the mating surfaces, but also avoids possible factors that may damage the motor winding during the manufacturing process because of the protection of the casing. The lift control has a certain improvement effect.

Heat conduction is referred to as heat conduction. The heat transfer process between two objects in contact with each other and with different temperatures, or between different temperature parts of the same object without relative macroscopic displacement, is called heat conduction. The property of a substance to conduct heat is called the thermal conductivity of an object. Heat transfer in dense solids and in still fluids is purely thermal conduction. The thermally conductive part is involved in the heat transfer in the moving fluid.

Thermal conduction relies on the thermal motion of electrons, atoms, molecules and lattices in materials to transfer heat. However, the properties of the materials are different, the main thermal conduction mechanisms are different, and the effects are also different. Generally speaking, the thermal conductivity of metals is greater than that of non-metals, and the thermal conductivity of pure metals is greater than that of alloys. Among the three states of matter, the thermal conductivity of the solid state is the largest, followed by the liquid state and the smallest in the gaseous state.

Thermal insulation or thermal insulation materials are often used in construction, thermal energy, cryogenic technology. Most of them are porous materials, and air with poor thermal conductivity is stored in the pores, so they can play the role of heat insulation and heat preservation. And they are all discontinuities, and the heat transfer has both the heat conduction of the solid skeleton and the air, as well as the air convection and even the radiation. In engineering, the thermal conductivity converted by this composite heat transfer is called apparent thermal conductivity. Apparent thermal conductivity is not only affected by material composition, pressure and temperature, but also by material density and moisture content. The lower the density, the more small voids in the material and the lower the apparent thermal conductivity. However, when the density is small to a certain extent, it means that the internal voids have increased or have been connected to each other, causing internal air convection, heat transfer enhancement, and apparent thermal conductivity increase. On the other hand, the pores in the thermal insulation material are easy to absorb water, and the evaporation and migration of water under the action of temperature gradient greatly increase the apparent thermal conductivity.