Recently, we have released a batch of motor failure and motor component feature pictures, which have attracted the attention of many netizens. Everyone has expressed their views based on their knowledge, work experience and personal experience. Regarding the segmentation of large motor cores, we will have a summary communication with everyone.

 

In the process of motor production and manufacturing, the segmented core is called a core with radial ventilation ducts. Its purpose is to add radial ventilation ducts inside the motor to solve the problem of motor temperature rise. Conversely, if the temperature rise of the motor is not a problem, it is not necessary to use this type of core.

 

From the analysis of the electromagnetic working principle of the motor, the motor has certain requirements for the net iron length. After adopting the radial ventilation structure, some necessary supporting elements (such as ventilation slots and ventilation slots) will be added, and according to the number of ventilation ducts, the total length of the core will increase. Naturally, the straight edge length of the stator and rotor conductors will increase. From the perspective of cost, the amount of electromagnetic wire or rotor bar material is increased.

From the analysis of motor performance, the increase of straight edges will also lead to an increase in stator and rotor leakage resistance, and is limited by structural parts. When radial ventilation ducts are added, the efficiency, power factor and other performance of the motor are affected. How to balance the relationship between temperature rise level and other performance and whether to use a core with radial ventilation duct structure is a problem that needs comprehensive consideration.

 

In addition, when using a core with radial ventilation duct structure, the quality assurance of the ventilation duct part and the alignment of the stator and rotor ventilation ducts are all problems that must be solved, otherwise it may increase the hidden dangers of electrical failures and may also cause derivative problems such as insufficient effective iron length of the motor; in other words. When the motor uses a core with radial ventilation ducts, the corresponding process must be fully followed up, otherwise it cannot really play its due role.

 

In the manufacturing process of the motor core, the paint of the hot-rolled silicon steel sheet and the oxide layer of the cold-rolled silicon steel sheet can effectively suppress the eddy current of the core. It only needs to be controlled by the thickness of the material, and it is not necessary to solve it by segmenting the core. What's more, the main function of the radial ventilation duct is to solve the problem of motor temperature rise, and effectively solve the problem of local heat accumulation of large motors through the internal air path.