EUPEC electrical components, German EUPEC models, EUPEC prices

EUPEC electrical components are commonly used low-current master control devices. They utilize the collision of moving parts of production machinery to actuate their contacts, thereby connecting or disconnecting control circuits to achieve specific control objectives. Typically, such switches are used to limit the position or travel of mechanical motion, causing the moving machinery to automatically stop, reverse, change speed, or perform automatic reciprocating motion according to a specified position or travel. In electrical control systems, the role of position switches is to implement sequence control, positioning control, and detection of position status. They are used to control the travel of mechanical equipment and provide limit protection. Structure: Composed of an operating head, contact system, and housing. In actual production, limit switches are installed at predetermined positions. When a module mounted on the moving part of the production machinery strikes the limit switch, the contacts of the limit switch actuate, achieving circuit switching. Therefore, a limit switch is an electrical device that switches circuits based on the travel position of moving parts; its operating principle is similar to that of a pushbutton. Limit switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In elevator control circuits, limit switches are also used to control the speed of opening and closing car doors, provide automatic door opening/closing limit protection, and provide upper and lower limit protection for the car.

EUPEC electrical component principles

When two conductors of different compositions (called thermocouple wires or thermoelectrodes) are joined at both ends to form a loop, an electromotive force is generated in the loop when the temperatures of the two junctions differ. This phenomenon is called the thermoelectric effect, and this electromotive force is called thermoelectric potential. Thermocouples use this principle for temperature measurement. The end directly used to measure the temperature of the medium is called the working end (also known as the measuring end), and the other end is called the cold end (also known as the compensation end). The cold end is connected to a display instrument or matching instrument, which indicates the thermoelectric potential generated by the thermocouple. A thermocouple is essentially an energy converter that converts thermal energy into electrical energy, using the generated thermoelectric potential to measure temperature. Regarding the thermoelectric potential of thermocouples, attention should be paid to the following issues: 1. The thermoelectric potential of a thermocouple is the difference between the temperature functions at the two ends of the thermocouple's working end, not a function of the temperature difference between the cold end and the working end; 2. The magnitude of the thermoelectric potential generated by a thermocouple, when the thermocouple material is uniform, is independent of the length and diameter of the thermocouple and depends only on the composition of the thermocouple material and the temperature difference between the two ends; 3. Once the material composition of the two thermocouple wires is determined, the magnitude of the thermoelectric potential depends only on the temperature difference of the thermocouple. If the temperature of the cold end is kept constant, the thermoelectric potential of the thermocouple is then a single-valued function of the working end temperature. Two conductors or semiconductors of different materials, A and B, are welded together to form a closed loop, as shown in the figure. When there is a temperature difference between the two junction points 1 and 12 of conductors A and B, an electromotive force is generated between them, thus forming a current of a certain magnitude in the loop. Thermocouples operate based on this effect.

EUPEC electrical component principles

When current flows through a conductor, the conductor heats up due to its inherent resistance. The heat generation follows this formula: Q=I2RT; where Q is the heat generated, 0.28 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time the current flows through the conductor. From this formula, we can easily understand the simple working principle of a fuse. Once the material and shape of the fuse are determined, its resistance R is relatively fixed (if its resistance temperature coefficient is not considered). When current flows through it, it generates heat, and the heat generation increases with time. The magnitude of the current and resistance determines the rate of heat generation, while the construction of the fuse and its installation conditions determine the rate of heat dissipation. If the rate of heat generation is less than the rate of heat dissipation, the fuse will not blow. If the rate of heat generation equals the rate of heat dissipation, it will not blow over a considerable period. If the rate of heat generation exceeds the rate of heat dissipation, heat will accumulate. Due to its specific heat capacity and mass, this heat accumulation manifests as a rise in temperature. When the temperature rises above the melting point of the fuse, the fuse blows. This is the working principle of a fuse. From this principle, it should be understood that when designing and manufacturing fuses, you must carefully study the physical properties of the selected materials and ensure they have consistent geometric dimensions, as these factors play a crucial role in the proper functioning of the fuse. Similarly, when using it, you must install it correctly.

EUPEC electrical component structure

1. The cathode of an electron tube is the component used to emit electrons, divided into oxide cathodes and thoriated tungsten carbide cathodes. Generally, oxide cathodes are indirectly heated, using a dedicated filament to heat the cathode body coated with barium oxide, etc., for thermionic emission. Thoriated tungsten carbide cathodes are generally directly heated, producing thermionic emission upon heating, so they serve as both the filament and the cathode. Theoretically, thoriated tungsten carbide cathodes have a much longer lifespan than oxide cathodes. Thoriated tungsten carbide cathodes are most widely used in high-power transmitting tubes, while oxide cathodes are generally used in transmitting tubes with an output power of 1kW or less. Mesh cathodes are made into a cylindrical shape using thinner thoriated tungsten wires. Their advantages are: (1) Because they are woven from many thoriated tungsten wires, they have a higher permeance. (2) It is easier to achieve a smaller cathode-grid spacing, which helps improve transconductance. (3) Since the filament has a mesh structure, the current in each individual filament wire is small, resulting in weaker local magnetic fields and thus reduced hum generated by the cathode current. 2. The grids of electron tubes are classified into first grid and second grid based on their roles within the tube, sometimes also referred to as control grid and screen grid. The main role of the first grid is to control the cathode current, while the role of the second grid is to shield the first grid from the influence of the plate. The grid structure relates to its own mechanical strength and heat dissipation effect, affecting whether the tube can operate stably. To reduce electron transit time, the grid-cathode spacing is made very short, even less than 1mm, so manufacturers often use materials with high mechanical strength, high thermal conductivity, good radiation coefficient, and high melting point to make the grids, to avoid thermal contact between electrodes at such small spacings. The first and second grids should be strictly aligned, so that the screen grid captures fewer electrons, reducing screen grid dissipation, improving current distribution, and enhancing linearity. 6. The anode of an electron tube is the electrode that collects most of the electrons emitted by the cathode. During operation, due to electron bombardment of the plate surface and thermal radiation from other electrodes, a large amount of thermal energy is generated at the plate. Since the power dissipation density of the plate is tens to hundreds of watts per square centimeter, natural radiation or conduction cooling is insufficient for such high power densities. Therefore, forced cooling methods must be used. Common methods include air cooling, water cooling, and evaporative cooling.

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