Why do cast aluminum rotor bars melt and flow out?_Wolong Nanyang Explosion-proof Motor, China Motor Manufacturer

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Why do cast aluminum rotor bars melt and flow out?

source：未知 time：2024-07-22 15:38nbsp; click：

Recently, I shared with you a rotor aluminum flow failure case. The motor showed that the stator and rotor were swept. After disassembly and inspection, it was found that the rotor had serious aluminum flow. It was also due to the aluminum flow problem that caused interference friction between the stator and the rotor.

Today, we will discuss with you why the motor rotor has aluminum flow problems. Theoretically, as long as the motor can pass strict inspection and testing, especially the assessment of the stall index, theoretically, there will be no problems such as rotor bluing or even aluminum flow in the motor application. However, if the factory test items of the motor are too simplified, the parts process inspection means are lacking, and there are potential quality risks in the rotor aluminum casting process. It may cause serious failure problems in the motor in the application.

However, due to the particularity of the manufacture of cast aluminum rotors of motors, problems in any link such as cast aluminum parameters, molds, and iron cores may lead to manufacturing defects in one of the links of the hidden project of cast aluminum, such as low density of rotor guide bars, shrinkage holes, thin bars or broken bars in rotor guide bars. If these problems are not discovered in the production and inspection of the motor, the guide bars are likely to be deformed due to the high rotor temperature during the operation of the motor, and in severe cases, the aluminum liquefaction will flow.

At present, the main processes for casting aluminum for motor rotors are high-pressure aluminum casting, low-pressure aluminum casting and centrifugal aluminum casting. In comparison, the low-pressure aluminum casting process can better guarantee the quality of the aluminum casting rotor, but the production efficiency is relatively low; the high-pressure aluminum casting and centrifugal aluminum casting processes are relatively efficient, but are prone to manufacturing defects inside the rotor.

In the process of high-efficiency motor research and development, it can be found that manufacturers using low-pressure aluminum casting technology have lower costs for high-efficiency motors, but the effect is excellent, which better achieves the goal of developing high-efficiency motors at low cost; but due to various factors, low-pressure aluminum casting is not popular in the production and manufacturing of motors, which is also a quality assurance problem that motor manufacturing technology needs to solve.

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