In recent years, the automation level of the domestic automobile manufacturing industry has been greatly improved, and the obvious trend is to improve assembly accuracy and production efficiency. As a positioning and detection method, a variety of sensors have been popularized in all aspects of the production line, especially the inductive sensors widely used by car manufacturers for positioning, which monitor the running status of the entire line in real time.
No one is unfamiliar with inductive sensors. It is a common way to locate metal objects at close range. Because the detection is mainly done through the Hall effect, it is also called a Hall sensor.
Its internal structure is composed of two parts: the front end is composed of an iron core wound with a transmitting and receiving coil; the rear end is a circuit part, and the whole is enclosed in a plastic or metal casing. During operation, an alternating magnetic field occurs in the electromagnet core part, which produces an eddy current effect on the surface of the close metal object, thereby weakening the LC oscillation circuit. The amplification circuit part analyzes the weak LC oscillation circuit change of the electromagnet core receiving coil and gives a corresponding output.
Choosing the right sensor will greatly improve the stability and reliability of the equipment operation, and also maximize the possibility of reducing the failure or damage of the sensor and reducing unnecessary maintenance investment. In the production process of the automobile manufacturing industry, inductive sensors are widely used as positioning detection. How to choose the most suitable product for this industry is particularly important.
The selection of this series of sensors mainly considers two factors:
(1) Longer detection distance: Slippage sometimes has a certain vibration during the movement, and the sensor needs to have a certain detection distance to ensure that the measured part of the slippage cannot be damaged due to the vibration leaving the detection area or hitting the sensor.
(2) Moderate external dimensions: Generally speaking, the detection distance and volume of inductive sensors are proportional. For the detection distance of 40mm, the square shell size of the 40 * 40mm detection surface is very suitable.
In addition to the selection of this main parameter, more details must be considered to suit the field conditions and make the sensors more compatible with the field environment and equipment.
First, detect the attenuation of distance. The slipper is made of iron, suitable for inductive sensor detection; the size of the tested part of the slipper is slightly smaller than the size of the standard test object (the standard test object size is 3 times the rated detection distance, in this application, the standard size should be 120 * 120mm ), In this case, there will be a certain attenuation, the above sensors have done a good job in this respect, and the attenuation is extremely small.
Secondly, anti-jamming capability on site. This is a problem that cannot be ignored. Ordinary inductive sensors are easily interfered by motors or frequency converters. Many technicians only choose sensors with strong anti-electromagnetic interference for applications in this vicinity. However, in the automobile manufacturing workshop, the plant is large, and the on-site technicians are used to using the intercom to communicate, especially when walking and talking on the intercom, they will inadvertently approach the sensor, resulting in a short-term failure. ELCO is very concerned about the C40 series products in this regard, to improve its overall electromagnetic compatibility, to avoid the occurrence of misoperation.
Furthermore, the installation aspect. With the popularization of inductive sensors, the sensors have not only improved in electrical performance, but their mechanical design has become more and more user-friendly. In this application, the sensing surface of the C40's inductive sensor can be easily adjusted to 5 directions. Without any tool assistance, there is no need to cut off the power supply and output plug-in, just by manual operation. It provides convenience for installation and use in different detection directions and maximizes humanized installation. Reduced the stocking of multiple similar products and reduced the time for installation and maintenance.
Finally, the guarantee of stable operation. The C40 has an IP67 protection level, which prevents any erosion of oil and dust in the use of the depot. In addition, when the slipper passes through the track, the vibration exists for a long time, and the excellent vibration resistance of the C40 also plays a very important role in this application.
In this project, the sensor technology solution provided by the ELCO company to the car manufacturer according to its working conditions is a relatively successful case, and it has achieved a stable and reliable detection link for automatic control in this project as a whole.
Micro inverter is a small inverter used in solar power generation systems, its main function is to convert the direct current generated by a single Solar Panel into alternating current. Unlike traditional centralized inverters, microinverters are usually equipped with one per solar panel, that is, each solar panel has an independent microinverter.
Main effect:
1. Individual control: The microinverter provides independent conversion control for each solar panel, which means that each solar panel can optimize its power output individually. This maximizes the power generation efficiency of the solar panels since shading or other influences only affect the power generation efficiency of individual panels, not the entire array.
2. Reliability: Since each solar panel is equipped with a micro-inverter, even if one of the inverters fails, the other panels can still work normally, thereby improving the reliability of the entire system.
3. Flexible installation: Micro-inverters are usually small and can be installed near solar panels without being concentrated in one location, so installation is more flexible and convenient.
Differences from other inverters:
1. Individual control: Compared with traditional centralized inverters, microinverters provide independent conversion control for each solar panel, enabling each panel to reach its maximum power output.
2. Fault isolation: The micro-inverter has the function of fault isolation. Even if one of the inverters fails, other panels can continue to work without affecting the operation of the entire system.
3. Installation method: The micro-inverter can be flexibly installed near the solar panel, and does not need to be concentrated in one location, so the installation is more flexible and convenient.
4. Applicable scale: micro-inverters are usually used in small-scale solar power generation systems, while traditional centralized inverters are suitable for larger-scale photovoltaic power plants.
Overall, the main role of microinverters is to individually control and optimize the power generation efficiency of solar panels and improve the reliability of the system. Compared with traditional centralized inverters, it has some advantages in terms of flexibility, fault isolation and applicable scale.
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