Why test motor stators in a vacuum environment?

AIP today share for you "Why test motor stators in a vacuum environment?"

May 19, 2023

Why test motor stators in a vacuum environment?

The motor stator is one of the core key components of the motor. Its quality directly determines the performance and even the safety of the motor. The conventional stator surge test generally sets a high voltage range of 1500-2500V in a non-vacuum environment, but for small damage Defective coils are often difficult to detect effectively due to insufficient withstand voltage energy. To solve this problem, the stator vacuum tester came into being.

The principle of testing the motor stator in a vacuum environment is that the coil is more likely to generate discharge in a vacuum environment so that it can better test whether the enameled wire of the coil is damaged. The "vacuum" mentioned in this article is not an absolute vacuum (under an absolute vacuum, there will be no discharge), but a negative pressure environment created by pumping out part of the air in the closed space through a vacuum pump.

Then why is the stator coil of the motor more prone to discharge in a vacuum negative pressure environment? This is because electric current is formed by the movement of free electrons. To generate a larger current, a large number of free electrons must be moved, and more electrons must be activated. The lower the air pressure, the smaller the constraints on the electrons, and the easier it is for the free electrons at the damaged point of the coil to get rid of the original constraints and "betray" to the other side. It is easier to detect defective products. The conclusion of the electrical experiment is that the reason why a conductor can accumulate charges is because of the existence of the atmosphere. That is, the atmosphere becomes a conductive substance due to ionization and generates a discharge. The thinner the atmosphere, the more intense the discharge. Therefore, the stator coil is more likely to generate discharge in a vacuum negative pressure environment than in air. Therefore, the air is not an ideal environment for the discharge of the coil, and some small damages cannot be tested.

After the theory of motor stator testing in a vacuum negative pressure environment was proposed, a large number of experimental verifications were carried out in developed countries such as Europe and the United States, and the results were unanimously recognized by motor manufacturers. AIP conducted research on this technology in 2010. , In 2011, began to provide this equipment technology for a foreign-funded enterprise, centering on the stator of the compressor motor. The motor stator test has been promoted to different industries, which has improved the motor stator test level in the industry. Up to now, more than 1,000 sets have been used online in the market.


With the continuous development of China's technology, motor technology has also continued to break through, and the detection of motors has become more and more stringent. Based on the vacuum negative pressure environment, AIP has overcome the industry problems of single-point damage detection of motors in 2018, and specially solved Aiming at the problem that only one point of the coil is damaged and cannot be detected by existing detection methods, this technology can replace the salt water test without damaging the motor, and can also be used in mass production on the production line. Once launched, it will cause a sensation in the entire industry, causing domestic and foreign Widely concerned by customers, AIP is committed to providing a one-stop motor testing solution. Choosing AIP means choosing peace of mind.

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