Monthly Archives: February 2025

　　The daily maintenance of marine diesel generator set is the key to ensure its stable operation. The following are some precautions for routine maintenance:Before that, marine generator The market has also soared for a time, which has attracted the attention of a wide range of investors. https://usrpower.com/product-category/marine-generators/pmg-yacht-generator/

　　I. General Maintenance of Marine Diesel Generator Set

　　Clean environment:

　　Ensure that there is no water, oil, dirt and corrosive gas near the marine diesel generator set, so as not to damage the insulation of the generator winding.

　　Always clean the dust and dirt in the ventilation duct and keep it unobstructed to ensure the normal ventilation and cooling of the generator.

　　Moisture and dust prevention:

　　Prevent the temperature of cooling air from being too low, so as to avoid condensation of water droplets on windings and other conductive devices.

　　While preventing moisture and dust, be careful not to affect the normal ventilation and cooling of the generator.

　　Rust prevention treatment:

　　If the machined surface of marine diesel generator sets is rusted due to paint peeling, it should be derusted in time and coated with antirust paint.

　　Second, the marine diesel generator set disassembly and inspection

　　Precautions for disassembly:

　　The disassembly and assembly method of marine diesel generator set is basically the same as that of asynchronous motor, but due to the heavy weight of generator, attention should be paid to avoid collision during disassembly and assembly.

　　When removing the end cover, be careful not to damage the stator coil protruding from the base; When taking out the rotor, put cardboard between the stator and rotor of the motor to prevent damage to the core and winding.

　　When binding the rotor with steel cable, the steel cable shall not touch the rotor journal, slip ring and transfer lead.

　　Regular inspection:

　　Check the inside of the generator carefully to ensure that there are no sundries and prevent them from falling into foreign bodies such as screws, tools and rags.

　　Check the lubrication of generator bearings, and the quality and quantity of lubricating oil and grease should meet the requirements of maintenance.

　　Check whether the connection between marine diesel generator set and its prime mover is good, and check whether the axes of the two engines are on the same straight line.

　　Check whether the rotor is flexible and the bearing quality.

　　Iii. Insulation and Drying of Marine Diesel Generator Sets

　　Insulation resistance measurement:

　　Measure the insulation resistance of the generator every three months, including stator and rotor.

　　In order to prevent the measured voltage from damaging the rectifier or other semiconductor equipment, the anode and cathode of the rectifier diode should be temporarily shorted, and the terminal of the electronic circuit board (such as AVR board) should be temporarily removed.

　　Use a 500V megohmmeter to measure the insulation resistance, which should be no less than 0.5MΩ.

　　Generator drying:

　　Newly installed synchronous generators should generally be dried before operation.

　　If the insulation resistance meets the requirements, drying is not required.

　　When the generator in operation is stopped for maintenance or stopped for more than the specified limit, and the insulation resistance is lower than the specified value, it must be dried.

　　Drying methods include hot air method, short-circuit current drying method and loading drying method.

　　Four, marine diesel generator operation monitoring

　　Temperature monitoring:

　　Monitor the temperature of each part of marine diesel generator set, including generator temperature rise and bearing temperature.

　　Excessive generator temperature will accelerate the aging of insulation materials and shorten the service life of generators.

　　For generators in the form of sliding bearings, the allowable bearing temperature is 70≧; For generators in the form of rolling bearings, the allowable bearing temperature is 80≧.

　　Voltage and power factor monitoring:

　　The generator voltage in operation should reach the rated value.

　　Monitor power factor and grid frequency to ensure normal operation of alternator.

　　To sum up, the daily maintenance of marine diesel generator sets involves many aspects, including general maintenance, disassembly and inspection, insulation and drying, and operation monitoring. By carrying out these maintenance work regularly, the stable operation of the generator set can be ensured and the service time can be prolonged.

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On the evening of the 16th local time, Thai Prime Minister Saita arrived at the hotel involved in the death of Vietnamese citizens and revealed at the on-site press conference that according to preliminary police judgment, the six people died more than 24 hours.

Thai police said at a press conference that there were no signs of struggle at the scene and the room was locked from the inside. It was initially speculated that it was murder and further investigation was being carried out.

At the press conference, a reporter asked whether the deceased had been poisoned to death. The police said that the specific cause of death could not be determined after further autopsy.

On the 16th, Thai police found six bodies in a luxury hotel in downtown Bangkok. The dead were six Vietnamese, two of whom held American citizenship. At the beginning of the incident, several Thai media reported that the deceased died in the shooting incident. Later, it was reported that the cause of death was suspected to be cyanide poisoning. However, at the press conference, the police did not make a clear announcement on the cause of death.

　　The main factors affecting the price of marine diesel generators include the following aspects. I hope the following introduction can bring reference to users.The above conclusions show that Gasoline vehicle generator To a great extent, it can bring new vitality to the market and make the industry develop well. https://usrpower.com/product-category/vehicle-generators/gasoline-vehicle-generator-car-generators/

　　First, the brand affects the price of marine diesel generators

　　Brand is one of the key factors affecting the price of marine diesel generators. By virtue of its technology, manufacturing process and good market reputation, brand-name generator sets have good quality and stable performance, so the price is relatively high. On the contrary, some minority brands may have lower prices, but there may be a certain gap in quality and performance.

　　Second, the power affects the price of marine diesel generators

　　Power is another important factor that determines the price of marine diesel generators. Under the same brand and specification, the higher the power, the higher the manufacturing cost and technical requirements, so the higher the price. At the same time, different power units are suitable for ships of different sizes and different electricity demand, so choosing the appropriate power is also the key to control the cost.

　　Third, the configuration affects the price of marine diesel generators

　　The configuration of marine diesel generator will also affect its price. In addition to the standard configuration, there are some optional accessories, such as sound insulation box, rain shelter, mobile trailer, automatic control system and so on. The increase of these configurations will improve the performance and experience of the unit, but it will also increase the cost accordingly. Therefore, when choosing the configuration, we need to make a trade-off according to the actual needs.

　　Fourth, raw material prices

　　The price of raw materials is also one of the important factors that affect the cost of marine diesel generators. The price fluctuation of raw materials such as steel and copper will directly affect the manufacturing cost of generator sets, and then affect their market prices. Therefore, it is necessary to pay attention to the dynamics of the raw material market and its impact on the price when purchasing.

　　V. Seasonal demand

　　Seasonal demand will also affect the price of marine diesel generators. In the peak demand season, due to tight market supply, prices may rise; In the off-season, due to fierce market competition, prices may fall. Therefore, it is necessary to pay attention to the changes in market demand and its impact on prices when purchasing.

　　To sum up, the price of marine diesel generators is influenced by many factors such as brand, power, configuration, raw material price and seasonal demand. When purchasing, we need to weigh and choose according to the actual demand in order to find a product with high cost performance.

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According to a report by Newsweek on July 15, Ukraine President Zelensky issued a severe warning on the insufficient aid provided by allies to Ukraine for F-16 fighter jets. He said the number of F-16 fighter jets Ukraine received from allies this year was not enough to fight Russia.

Zelensky said at a press conference held in Kiev on the 15th: The decision to hand over F-16 fighter jets to Ukraine is strategic, but their number is not strategic.

U.S. Secretary of State Blinken said last week that Ukraine’s NATO allies have begun handing over U.S. -made F-16 fighter jets to Ukraine and announced that the fighters will fly over Ukraine this summer to ensure Ukraine can continue to effectively defend against Russia.

Reported that Denmark, Norway, the Netherlands and Belgium have promised to provide a total of more than 60 fighter jets to Ukraine this summer. However, Bloomberg News quoted unnamed sources as saying on July 12 that Ukraine may receive far less fighter jets this year than expected to receive only 6 this summer, and may receive 20 by the end of the year.

Zelensky told reporters: I can’t say now how many such aircraft (we) will have. But their numbers are not enough. They will certainly strengthen us, but whether these aircraft are comparable to the Russian aviation fleet is not enough. Do we expect more? Of course!

The report mentioned that on May 29, after Belgium promised to deliver the first batch of F-16 fighter jets to Ukraine this year, Russian Foreign Minister Lavrov issued a warning to the West. (Compiled by Long Jun)

　　When marine diesel generator sets drain water tanks in winter, the following key points should be paid attention to. For example, pay attention to the time of water discharge, matters needing attention in water discharge operation and so on. I hope the following introduction can bring reference to users.In the eyes of peers, Gasoline vehicle generator It has good qualities that people covet, and it also has many loyal fans that people envy. https://usrpower.com/product-category/vehicle-generators/gasoline-vehicle-generator-car-generators/

　　First, the timing of discharging water from the water tank of marine diesel generator set

　　Stop and wait: drain water 15 minutes after the stop, at which time the water temperature has dropped, avoiding the excessive temperature difference between the fuselage and the external environment caused by immediate water discharge, which will cause deformation of parts, such as cylinder head, and affect the performance of the unit.

　　Avoid draining water at high temperature: Before the engine is turned off, if the temperature is very high, don’t stop immediately to drain water. Unload the load first, make it run at idle speed, and then drain the water when the water temperature drops to 40~50≧. This can prevent the outer surface temperature of the cylinder block, cylinder head and water jacket which are in contact with water from suddenly dropping and shrinking, while the temperature inside the cylinder block is still very high and the shrinkage is small, so it is easy to cause cracks in the cylinder block and cylinder head due to excessive temperature difference between inside and outside.

　　Second, the marine diesel generator water tank water operation

　　Observe the water flow: open the drain valve or switch and pay attention to the specific situation of the water flow. If the water flow is smooth and continuous, it means that the water in the cooling system can be discharged normally. If the water flow becomes smaller or faster or slower, it means that the water contains impurities or scale, which may hinder the normal discharge of water. At this time, the water drain valve or related components should be removed, so that water can be directly discharged from the body. If the water flow is still not smooth, it can be dredged by hard and slender rigid objects such as iron wire until the water flow is smooth.

　　Rocking unit: When the cooling water stops flowing out, the diesel generator set is rocked for a few more turns, so that the residual cooling water that is not easy to flow out will flow out because of the vibration of the marine diesel generator set. This can prevent the water plug on the cylinder head from freezing, thus preventing the cooling water from flowing into the oil shell in the future.

　　Keep the water drain switch in the state: if the water drain switch is not removed, make sure it is in the open state after the water drain is completed, so as to prevent the cooling water that cannot flow out for various reasons from freezing the relevant components of the diesel generator set.

　　Open the water tank cover: open the water tank cover when discharging water, otherwise the cooling water will not flow smoothly, and parts may be frozen due to unclean water discharge in winter.

　　Third, the follow-up treatment

　　Idle drying: In the cold winter, the engine should be started to idle for a few minutes after the cooling water in the engine is released. This is mainly due to the fact that some water may remain in the water pump and other parts after water is drained. After restarting, the residual water in the water pump and other parts can be dried by the body temperature to ensure that there is no water in the engine and prevent water leakage caused by freezing of the water pump and tearing of the water seal.

　　Four, marine diesel generator water tank other maintenance suggestions

　　Maintenance of water tank: the water tank of marine diesel generator set uses pure water, and the radiator is cleaned regularly to prevent internal scaling or deposits from affecting the heat dissipation effect.

　　Preheating measures: when the temperature is low, the marine diesel generator set should be preheated before starting to ensure the smooth start and stable operation of the unit.

　　To sum up, the marine diesel generator set needs to follow certain steps and precautions when draining the water tank in winter, so as to ensure that the water in the cooling system can be completely drained and prevent the related components from being damaged.

　　The typical depth of the V-cut is 3/4 of the board¨s thickness. If you plan to use V-cuts, we recommend maintaining a safe distance from the V-cut line to any traces. Please consider this when designing your panels.know PCB manufacturing in China The market will definitely bring great influence to the whole industry. https://www.wellcircuits.com/

　　V-cut example 1

　　V-cut Example 1

　　V-cut example 2

　　V-cut Example 2

　　V-cut example 3

　　V-cut Example 3

　　V-Cut Machine

　　The image above is from the crowdfunding project ＾Neosegment Digit￣ by Maks Surguy on Crowd Supply. The project has gained significant attention, raising a total of $6,500. We are proud to support Maks in assembling this project.According to professional reports, PCB meaning There will be a great period of growth, and the market business is constantly expanding, and it will definitely become bigger and bigger in the future. https://www.wellcircuits.com/

　　Wellcircuits has also assisted creators with the assembly of the following projects on Crowd Supply:

　　ALio Proto Board: The All-in-One Prototyping Board

　　Neosegment Digit

　　Paperino

　　Crowd Supply is a popular crowdfunding platform based in Portland, Oregon, known for supporting creators in bringing innovative and useful hardware to life. Their mission is to provide the necessary funding and resources to help creators deliver high-quality products to their backers.

　　We first met at the 2017 Open Source Hardware Summit, where we discussed the potential for future collaboration. Both of our goals are aligned in helping enthusiasts bring their projects to life. Today, we are excited to announce our partnership:

　　Any successful crowdfunding project on Crowd Supply is eligible for a 10% discount (up to $300) on PCB assembly services at Wellcircuits. You can also apply for a coupon code for your backers. Simply send your project link to anson@wellcircuits.com to receive your discount.

　　As a professional PCB production and assembly company, Wellcircuits has earned a strong reputation among engineers worldwide. This partnership will leverage our strengths to ensure smooth execution for crowdfunding projects. All of our components are original, and we guarantee on-time delivery, ensuring your supporters receive their products as quickly as possible. Additionally, you can count on excellent after-sales service at Wellcircuits.

　　Let¨s create something amazing together!

　　Flexible circuits, also known globally as flex circuits, flexible printed circuit boards, flex print, or flexi-circuits, are part of the electronic and interconnection family. They consist of a thin insulating polymer film with conductive circuit patterns affixed to it, usually coated with a thin polymer for protection.If we can practice these points, FLEX PCB Will be unique, become a leader in the industry, and keep moving forward. https://www.wellcircuits.com/

　　The technology has been used for interconnecting electronic devices since the 1950s and is now a crucial interconnection technology in many advanced electronic products today.

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　　Size and Weight Reduction Benefits of Flexible Circuitry

　　Wiring solutions that fit where rigid boards cannot.

　　Thin, lightweight products that are durable.

　　Miniaturized versions of existing technologies.

　　Three-dimensional packaging geometry.

　　A low number of device interconnects.

　　Shock and vibration resistance.

　　These benefits highlight flexible circuitry as an ideal solution for mobile consumer electronics. Inside modern devices like smartphones and laptops, flexible circuitry plays a critical role.

　　In mobile devices, using rigid circuitry would result in devices that are too large, heavy, and fragile to carry conveniently, exemplified by the Osborne I, the first fully powered mobile computer, weighing an intimidating 24.5 pounds. Size and weight reduction is only part of the flexible circuit story; they are also ideal for high-temperature and high-density applications.

　　High Temperature and High-Density Applications

　　Flex circuits, often made of polyimide or similar polymers, dissipate heat better than most rigid circuit board materials. This feature allows flexible circuits to be placed in locations where heat would impact the performance of rigid circuit boards.

　　Flexible circuit boards can withstand extreme temperatures ranging from -200＜C to 400＜C, making them desirable for borehole measurements in the oil and gas industry and preferred in industrial sensor technologies for their small size and durability.

　　High temperature resistance, combined with chemical resistance, excellent resistance to radiation and UV exposure, and the ability to control impedances in high-density designs, makes flexible circuits highly beneficial for manufacturers.

　　Why Not Make All Circuit Boards Flexible?

　　Flexible circuit boards are certainly useful, but they are not going to replace rigid circuit boards for all applications. Cost efficiency is the main obstacle to implementing an exclusively flexible circuit board design in a consumer product. Rigid circuit boards are less expensive to manufacture and install in a typical automated high-volume fabricating facility.

　　Typically, the ideal solution for an innovative product is one that incorporates flexible circuitry when necessary, and employs solid, reliable rigid circuit boards where possible to keep manufacturing and assembly costs down.

　　The typical depth of the V-cut is 3/4 of the board¨s thickness. If you plan to use V-cuts, we recommend maintaining a safe distance from the V-cut line to any traces. Please consider this when designing your panels.In view of the actual needs of society, PCB manufacturing in China We need to change some original problems to better serve the society and benefit people. https://www.wellcircuits.com/

　　V-cut example 1

　　V-cut Example 1

　　V-cut example 2

　　V-cut Example 2

　　V-cut example 3

　　V-cut Example 3

　　V-Cut Machine

¡¡¡¡Last year, WellCircuits hosted the First PCB Design Contest. Kevin Ceresa was one of the participants, and his entry, the Audio Amplifier 60W, won second prize for Best Design. We are honored to have the opportunity to interview this passionate advocate of Open Source Hardware and electronics.On the other hand, FLEX PCB It also brings tangible benefits to everyone and feels useful. It is a model of the industry. https://www.wellcircuits.com/

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¡¡¡¡Kevin Ceresa Interview Image

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¡¡¡¡WellCircuits Team: ¡°Hello Kevin, congratulations once again and thank you for agreeing to this interview.¡±

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¡¡¡¡Kevin: ¡°Thank you, it¡¯s truly an honor.¡±

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¡¡¡¡WellCircuits Team: ¡°Could you please introduce yourself briefly? Many other engineers in the WellCircuits community are eager to learn more about you.¡±

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¡¡¡¡Kevin: ¡°Sure! I am an electronic engineering student and began my career at 16 years old. I have worked on various electronic projects that gave me valuable experience, and I am still involved in a few startup projects.¡±

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¡¡¡¡WellCircuits Team: ¡°I visited your website, Swiss TI Lab, which was co-founded by you and Daniele Chiappa. Can you tell us more about your lab and the story behind its establishment?¡±

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¡¡¡¡Kevin: ¡°We decided to start the company after our first project launched on Kickstarter. After the initial phase, we continued to design electronic products for both companies and private clients.¡±

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¡¡¡¡WellCircuits Team: ¡°Regarding the 2017 WellCircuits PCB Design Contest, how did you learn about the competition, and what motivated you to participate?¡±

¡¡¡¡

¡¡¡¡Kevin: ¡°As a WellCircuits customer, I found a post about the contest on their Facebook page. I joined to challenge myself and thought one of my designs could be a good fit for the competition.¡±

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¡¡¡¡WellCircuits Team: ¡°Why did you choose your Audio Amplifier 60W project as your contest entry? And how did it feel when you learned that you were one of the winners?¡±

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¡¡¡¡Kevin: ¡°I initially built the amplifier to enhance my skills with the PCB design software I was using, after completing an advanced course. I chose it as my contest entry because it was one of my best designs on a 2-layer PCB and the most practical project for the community. When I found out I won, I was thrilled ¡ª I didn¡¯t expect to win at all.¡±

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¡¡¡¡WellCircuits Team: ¡°What do you think is the most important quality for a good designer?¡±

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¡¡¡¡Kevin: ¡°Experience is crucial when designing electronic projects. It helps you avoid mistakes during schematic design and layout, significantly reducing the time needed to complete the project.¡±

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¡¡¡¡WellCircuits Team: ¡°How do you see the future of open-source hardware?¡±

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¡¡¡¡Kevin: ¡°With the advancement of technology and decreasing costs of electronics, more people can leverage community knowledge to build anything. I believe WellCircuits plays a significant role in this evolution.¡±

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¡¡¡¡WellCircuits Team: ¡°Thanks! What are your thoughts on our website and community? Do you have any suggestions for improvement?¡±

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¡¡¡¡Kevin: ¡°I think the website is well-designed, though it lacks translations into other languages. I¡¯ve ordered many PCBs from you, and I¡¯ve never had any issues. However, I don¡¯t use the community forum much.¡±

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¡¡¡¡WellCircuits Team: ¡°Thank you for your feedback. Our Spanish website is now available, and we are also working on Russian and Japanese versions. One last question: If we hold another PCB Design Contest, would you participate again, and would you encourage your friends to join as well?¡±

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¡¡¡¡Kevin: ¡°I will definitely participate again. I¡¯ve already suggested the contest to my friends, and I¡¯ll remind them to join if the competition is held again.¡±

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¡¡¡¡WellCircuits Team: ¡°That¡¯s all. Thank you once again, Kevin. We wish you all the best!¡±