The effect of low-temperature plasma surface treatment on the inter-turn insulation performance of variable frequency traction motors
The effect of low-temperature plasma surface treatment on the inter-turn insulation performance of variable frequency traction motors: Polyimide (PI) is used in the turn-to-turn insulation of traction motors of high-speed EMUs due to its excellent dielectric properties. China's high-speed railways have achieved world-renowned achievements through the introduction, digestion, absorption and re-innovation. The frequency conversion traction motor is one of the core equipment of high-speed EMUs. Its speed adjustment is carried out through pulse width modulation (PWM) technology. Due to the short rise time and high frequency of the pulse, the cable and motor terminal Impedance detuning will generate overvoltage, which will impact the inter-turn insulation of the motor, causing its insulation failure and threatening driving safety. Polyimide (PI) is used as the inter-turn insulation material of the variable frequency motor, which uses a 2/3 stacking method to wind the magnet wire, that is, there are three layers of PI film on the magnet wire as the inter-turn insulation of the motor winding. In the process of material preparation, magnet wire winding, etc., defects such as air gaps and wrinkles will inevitably occur between the inter-turn insulating materials of the frequency conversion motor. Studies have shown that the partial discharge in the insulation between the turns of the variable frequency motor is the root cause of the insulation failure of the motor. Therefore, the low-temperature plasma surface treatment can improve the partial discharge resistance of the inter-turn insulation of the inverter motor, which can significantly increase the insulation life of the motor and ensure the safe operation of electric locomotives. In recent years, low-temperature plasma surface treatment technology has been widely used in surface modification of polymer materials. Because of its simple structure and the ability to generate large-scale low-temperature plasma in atmospheric air, it is widely used in industrial production. Low-temperature plasma treatment can cause etching, cross-linking, and group introduction on the surface of the material, thereby significantly changing the surface characteristics of the material, such as hydrophilicity, hydrophobicity, flashover voltage along the surface, surface charge dissipation, space charge accumulation characteristics, etc. . The partial discharge between the insulation of the inverter motor is also a kind of gas discharge that occurs on the surface of the material in the air gap, and its working voltage is a square wave pulse voltage. Increase the intensity of the discharge in the air gap. Therefore, low-temperature plasma surface treatment can be used to only change the surface of the material without affecting the superior characteristics of its internal matrix structure. Plasma surface modification of the polyimide film can be used to improve its insulation performance. The contact angle is a key parameter reflecting the surface energy of the film, which is determined by the surface characteristics of the film. The smaller the contact angle, the stronger the hydrophilicity of the film surface and the greater the surface energy. The modification of materials by plasma is actually a process of interaction between the plasma and the surface of the material. In this process, the etching of the surface of the material, the cross-linking of molecular chains, and the introduction of polar functional groups mainly occur. The highly active plasma ionizes or excites many molecules in the air (such as H2O, 02, N2, etc.) and forms particle products (N2, O2, O, H, ultraviolet light, etc.), which are processed in the plasma During the process, it will bring higher energy and hit the PI film. On the one hand, the PI film will be cross-linked or etched, so that the inert substances in the amorphous area on the surface are eliminated and the active groups are exposed. On the other hand, the active particles will also cause the PI molecular chain to undergo a ring-opening reaction, and introduce -NH2, -COOH, -OH and other polar hydrophilic groups at the end of the molecular chain, thereby improving the hydrophilicity of the surface of the material and the surface can. In addition, the increase of polar groups and the exposure of active materials will also increase the number of carriers on the surface of the material, thereby increasing the surface conductivity of the material. The double-layer film without low-temperature plasma surface treatment is only a simple physical stacking, and it is difficult to form cross-links or cross-connections between the PI molecules between the layers, and thus cannot form a charge transfer channel, which makes Schottky emission or field emission injection into the film The internal electrons are easy to accumulate inside a layer of the film, and it is difficult to reach the second layer. In addition, the low conductivity of the interface between the l
Professionals answer the types of plasma treatment machines and plasma equipment in the industry
Professionals answer the types of plasma treatment machines and plasma equipment in the industry: I believe people in the industry are not unfamiliar with the term plasma treatment machine, plasma equipment or plasma cleaning machine, because there are already many industrial products in China that use equipment such as plasma cleaning machine for surface cleaning. Many manufacturers are not very clear about what a plasma processor is when they need to purchase a machine, nor are they very clear about how many types of plasma equipment it is divided into. It's like sometimes when a professional manufacturer of plasma equipment made by Shenzhen Chengfeng Zhizhi receives a call from a customer, the customer proposes to buy a plasma processor, and asks which one to use, it may not be right all at once. , Because there are many types of plasma equipment such as plasma cleaning machine. Now let's make a simple classification introduction. Plasma equipment on the market currently includes: plasma treatment machine, plasma treatment machine, plasma surface treatment machine, plasma equipment, vacuum plasma equipment, plasma cleaning machine, low temperature plasma equipment, as well as plasma surface treatment equipment, roll-to-roll plasma equipment , And atmospheric plasma equipment and so on. The plasma equipments introduced now are common types in the current market. As for how to distinguish these equipments, please consult our customer service hotline for details. Therefore, customers should do some understanding before purchasing the machine, what kind of plasma cleaning machine is needed for their products for pre-processing, if they understand, then they can easily buy the products they are satisfied with when they buy the machine. Of course, professional manufacturers of plasma treatment machines like Shenzhen Chengfeng Zhizhi will provide customers with satisfactory services and products in detail, and are committed to helping customers solve problems. If standardized equipment does not meet customer needs, non-standard customized equipment can be used. , Which is a one-to-one plasma processor solution (customized solution), and to achieve customer satisfaction as the standard. Such a professional plasma equipment manufacturer can be said to have a good reputation in the industry, and the brand of Chengfeng Zhizhi plasma equipment also has a certain influence in the market. It can be said that it is the brand of choice for many companies on the market.
What is the difference between the treatment of the PTFE microporous membrane by the plasma cleaning machine and the untreated
What is the difference between the treatment of the PTFE microporous membrane by the plasma cleaning machine and the untreated: In the production of PTFE microporous membranes, plasma cleaning equipment is often used to modify the surface of various materials, such as: sterilization membranes, electrolytic membranes, gas dialysis membranes, ultra-clean membranes, mountaineering clothes, breathable tents, raincoats, etc. . So, what is the relationship between cleaning equipment and PTFE microporous membrane? What is the change of PTFE microporous membrane after treatment by plasma cleaning machine equipment? Due to the low surface energy of the PTFE microporous film itself, it often faces problems of hydrophobicity and adhesion during the application process. If the above problems cannot be completely solved, plasma cleaning equipment can be used for treatment. In the plasma surface modification, plasma grafting modification technology is used more to reduce the contact angle between the surface of the PTFE microporous membrane and water, so that It becomes a hydrophilic material and can also make the surface of the PTFE microporous membrane oleophobic. The surface modification of the PTFE microporous membrane is carried out by plasma cleaning equipment. In a vacuum environment, the plasma generator is used to generate glow discharge from the gas to generate high-energy particles, and carry out a series of physical or chemical reactions with the PTFE microporous membrane. Not only retains the excellent properties of PTFE materials, but also makes PTFE microporous membranes have new hydrophilic, oleophobic and other characteristics, adapting to a wider range of application scenarios and uses. Chengfeng Zhizao has focused on the research and development of plasma technology for 20 years. If you want to know more product details or have questions about the use of the equipment, please click "Online Customer Service", and Chengfeng Zhizao is waiting for your call!
Can plasma treatment equipment enhance ionization? What are some good methods
Can plasma treatment equipment enhance ionization? What are some good methods: The ionization phenomenon in plasma processing equipment is closely related to the movement of electrons, and enhanced ionization also has a great impact on the effect of plasma processing. Then, how can the ionization effect of plasma processing equipment be enhanced? There are two existing proof methods, one is obtained through the reasonable coordination of the time between the electron and the field position in the elastic collision, and the other is obtained through the "surfing" effect. For the mechanism of electron acceleration, the ideal condition is that when electrons collide with argon atoms elastically and turn in the electric field, the speed and energy of the electrons will increase; if the above conditions are met, the electrons can obtain ionization energy, even if the electric field strength is very weak. , It can also get ionization energy. In this mechanism, the ideal range of electric field frequency is usually around several thousand MHz. Some scholars have extended this mechanism. They believe that the secondary electrons emitted from the wall and the cathode enter the photodischarge area after being accelerated, and become an additional source of electrons, which is a phenomenon of secondary electron multiplication. When the secondary electrons are released, if the electric field is reversed to achieve the same phase, the ionization can be effectively enhanced. The impulse effect is another evidence mechanism of ionization enhancement. It is generally believed that under the action of a high-frequency alternating electric field, the "impulse" phenomenon of electrons at the interface of the electrode sheath of the plasma treatment equipment can effectively enhance ionization, which is generally expressed as plasma The sheath voltage and sheath of the body treatment equipment fluctuate continuously. Existing calculations and demonstrations show that electrons obtain energy through sheath oscillation, and "surfing" electrons will have a positive effect on the ionization process. Chengfeng Zhizao has been focusing on plasma processing equipment for 20 years. If you have any questions, please click "Online Customer Service" for consultation. Chengfeng Zhizao is looking forward to your call!
Who is to blame for the vacuum-type plasma cleaner that cannot be pumped down
Who is to blame for the vacuum-type plasma cleaner that cannot be pumped down: During the use of the vacuum plasma cleaner, there may be such a phenomenon: the equipment is operating normally, and after replacing the new product, the vacuum increases and cannot be pumped down. Why? Have you discovered the mystery? I will share with you now for reference only. To determine whether the vacuum plasma cleaner vacuum chamber can be pumped backward, such as 30Pa, within 50S when the vacuum chamber is empty, and when processing other products, the equipment does not give an alarm, indicating that there is no problem with the pumping capacity of the vacuum pump. And there is no air leakage in the entire vacuum generating system. Judging from the operating conditions of the vacuum plasma cleaner equipment, the operation of the equipment is stable. If the background vacuum cannot be pumped to the alarm within a set time, such as 200S, it is mainly related to the material of the product being processed. We usually call it "material leakage". If the substance contains volatile substances, such as moisture, solvents, plasticizers, etc., and the vacuum escapes, the vacuum will decrease, which is called outgassing. Material leakage is the leakage rate of the material. Each material is different, and it is mainly determined by the density of the substance. The higher the density, the higher the leakage rate of the substance, and the lower the leakage rate of the substance; the higher the density of the substance molecule. The smaller the gap between, the smaller the density, the larger the gap between the material molecules, and the gaps between the molecules contain gas. In a vacuum state, the smaller the molecular gap inside the substance, the gas slowly flows from the inside of the substance to the outside. Exhaust until the pressure balances, this process is relatively slow, so after the vacuum plasma cleaner is evacuated to a certain degree, the vacuum degree is reduced. The speed of the vacuum degree reduction is related to the quantity of discharge, and the discharge speed also has Relationship, the more the number of times of feeding, the slower the speed of feeding will decrease. If there are volatile substances in the cavity, it can also cause the vacuum to be slow. Such as permeable material-sponge permeable material-copper wire skeleton. Moreover, the vacuum plasma cleaning machine is limited by the overall structure, and generally cannot be modified. The ideological analysis can be solved by increasing the pumping capacity. However, if the product is reduced after the pumping is increased, the vacuum will be reduced, and the power supply will be reduced. The load will increase, and it will be unstable, it is easy to burn out the power supply and matching device, causing unnecessary losses. Generally, the method of extending the vacuum time (changing the system parameters) and reducing the number of venting is used to ensure the normal operation of the equipment; other similar products can also be used, such as cleaning with the equipment. Therefore, before purchasing a vacuum plasma cleaner, you should conduct tests based on samples, and fully consider the impact of material infiltration on the vacuum of the equipment, otherwise it will be difficult to meet the processing requirements of the required products. If the ordered equipment cannot be upgraded or modified, it can only be solved by reducing the amplifier and increasing the pumping time. The explanation of the above-mentioned material leakage affecting the vacuuming of the vacuum plasma cleaner is helpful to you, what other experiences and experiences do you have, please leave a message to communicate and share with us! If you are interested in plasma cleaners or want to know more details, please click Chengfeng Zhizao online customer service consultation, Chengfeng Zhizao is waiting for your call!
What are the benefits of plasma equipment pretreatment of engine guard plate before epoxy foaming
What are the benefits of plasma equipment pretreatment of engine guard plate before epoxy foaming: The material of the engine guard plate includes hard plastic, steel, aluminum alloy, plastic steel, etc. The foam plastic is usually used for surface pretreatment with plasma equipment before foaming to increase adhesion and reliability. Plasma surface treatment can completely remove dirt, activate the surface, and improve bonding quality. The main function of the engine guard plate is to protect the engine and prolong the service life of the engine. Its materials include hard plastic resin, iron or manganese alloy guard plate, aluminum alloy, plastic steel "alloy" guard plate, etc. Epoxy foaming of engine guard plate is to form good sealing effect, high weather resistance and high reliability requirements. Plasma surface treatment by plasma equipment can completely remove contaminants on the surface of the material, activate the surface, and improve the quality of bonding. Plastics are increasingly used as engine guards, and the main chemical composition of plastics is modified polymers, also known as modified copolymer PP. It has excellent performance, convenient processing, and wide range of uses. Because of its excellent physical properties such as rigidity, elasticity, corrosion resistance, and aging resistance, it is an ideal substitute for non-ferrous metals such as copper, zinc, and aluminum. Function hinders. However, the surface energy of polypropylene material is low, and the reliability of combining it with glue without special primer will be reduced. These glues are expensive to use, and VOC gas will be generated at high temperatures, causing harm to the human body; plasma surface treatment technology is environmentally friendly , Low cost of use and other advantages, more and more attention by engine guard plate manufacturers! Before the plasma treatment of the plasma equipment, the surface energy of PP is low, it is not easy to stick to water, and it is in the shape of water droplets. The surface of PP treated by plasma equipment is enhanced, and the water droplets are easy to spread and spread out completely. The change of water droplets on the surface of the engine guard plate, users report that the adhesive foaming effect has been significantly improved, this process is very worth recommending! The above description of the benefits of plasma surface treatment of the plasma equipment before epoxy foaming of the engine guard plate. Do you have any different opinions or suggestions on this? Welcome to leave a message to communicate and share with us! If you are interested in plasma cleaners or want to know more details, please click Chengfeng Zhizao online customer service consultation, Chengfeng Zhizao is waiting for your call!
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