With the increasing complexity of low-voltage power distribution and control systems, the market places higher demands on the performance and structure of low-voltage electrical products. The improvement and development of electrical products, and the application of new technologies and standards are inseparable. The development and application of new technology have a direct impact on whether the market demand for products is possible or not. The development of standards directly restricts whether the products can be used in the market, which determines the direction of product development. Its new technologies include modern design technology, intelligent technology, fieldbus technology and simulation technology.
1, the development and application of modern design technology
Electrical appliances involved in the work process of electricity, magnetism, light, heat, force, machinery, materials, electrical contact, reliability and other aspects of the principle and technology. Most of the energy, such as electricity, magnetism, light, heat, force and machinery, are non-linearly transformed. Many phenomena are transient processes that make the theoretical analysis, product design and performance testing of low-voltage electrical appliances extremely complicated. In the analysis and design of low-voltage electrical products, in addition to using the traditional theory of low-voltage electrical appliances to make the necessary theoretical derivation, analysis and calculation, but also the use of a large number of empirical data. Therefore, it is very difficult to design low-voltage electrical products with good performance and reasonable price.
The design process of low-voltage electrical products is very complex, to go through repeated calculation and research of electrical characteristics and mechanical characteristics. Even so, the design calculation parameters and the actual performance of the product, there is still a big gap, must be repeated through the test verification. Therefore, low-voltage electrical product development cycle long, large capital investment.
Using the latest optimization design method, genetic algorithm to establish optimal dynamic mathematical model can be designed to small size, light weight, low cost, reasonable price and good reliability of the work of electrical products.
At the same time, the application of three-dimensional computer aided design system also makes the product design process simple and intuitive. 3D CAD systems are designed, manufactured and analyzed in a single package. From part design and assembly to final product assembly, designers can directly observe interferences and bumps in part assemblies and switch electrical closures on the computer screen. Moving parts And the related parameters (such as contact open distance), so as to ensure the correctness of design and create the conditions for the trial production of low-voltage electrical products across the model stage. Designers at any stage of product development made changes to any part of the product can automatically be reflected in the relevant parts changes. At the same time, the 3D software system automatically transfers to the part mold design according to the finished part design, greatly shortens the trial time and product development cycle of the product, and improves the competitiveness of enterprises.
2, the application of intelligent technology
The application of intelligent technology in low-voltage electrical appliances makes fundamental changes to the low-voltage electrical appliances in all aspects of research, testing and production.
â‘ intelligent control technology
Smart electrical components and intelligent distribution network system application.
The intelligent circuit breaker integrates the function of the intelligent monitor and the circuit breaker, mainly realizing the intelligent circuit breaker. The intelligent circuit breaker with a microprocessor reflects the true rms value of the load current and can avoid high-order Harmonic effects.
Compared with the traditional bimetallic thermal relay, the microelectronic controlled thermal relay can protect the motor from overload, phase failure, three-phase imbalance, reverse phase, low current, grounding and undervoltage faults, etc., and can digitally display the type of fault , To protect different starting conditions and working conditions of the motor, the operating characteristics of reliable.
On the basis of intelligent electrical components, research and development of intelligent switchgear, effectively improve the degree of automation of the control system.
â‘¡ intelligent detection technology
Optical mechanical and electrical electromagnetic dynamic test device used in the new intelligent AC contactor research and development, in-depth study of real-time optimal control of electrical appliances, to achieve optimal operation and significantly improve its performance indicators, shorten the design cycle has played an important role .
3, the application of field bus technology
Fieldbus is a low cost, reliable and suitable for industrial environments using communication systems, the traditional communication system requires multi-core cable for parallel data transmission, and the field bus only requires a two-core cable, the wiring is very simple, Reduce installation and maintenance costs. Field bus according to national standards using a unified communications standard, so it has good interchangeability and interoperability. It is unrelated to the manufacturer of the system, a variety of field devices in accordance with this standard and protocol production can be used on the network. Fieldbus production plant can provide a variety of fieldbus standard components, including the interface, a variety of intermediate relays, modular I / O stations, etc., easy to install and maintain, suitable for the dispersion characteristics of field devices.
Communication Low-voltage electrical appliances can be installed in the intelligent switchgear with bus system or installed in the field of the controlled equipment. The low-voltage electrical appliances are connected to the host computer through the bus for real-time data exchange and make the system have four remote functions. After adopting the field bus system, each drawer in the low-voltage control cabinet, especially the original motor control center has developed into an independent intelligent control unit, which is directly installed on the scene and connected with the upper computer through the field bus. Largely save the main loop cable and secondary control line. The application of bus technology has brought a new revolution to the low-voltage distribution and control system.
4, the application of virtual simulation technology
For electrical products to meet the expected technical conditions, must undergo repeated tests. The application of computer simulation and simulation technology can accurately grasp the performance of electrical products, reduce the duplication of prototype production, reduce test costs, speed up product development cycles and improve product performance indicators before prototype production.
The basic characteristics of low-voltage electrical appliances, including on-off capacity, temperature rise, parts strength, thermal stability, insulation and other electrical properties. This requires the design object of the electromagnetic field, stress field, magnetic field and other physics simulation and analysis. By calculating the simulation can be the feasibility of product design programs to meet the technical requirements of products. However, in order to achieve the best economic and technical indicators, simulation technology and optimization methods must be combined to achieve the desired results. With the rapid development of computer graphics technology, virtual technology will be introduced into the design of low-voltage electrical appliances. It is designed to simulate and optimize electrical products in a virtual environment, which has led to a new stage in the design and research of low voltage electrical appliances in China.
CNC Milling is to use the rotating multitool to cut workpieces, such processing method is efficient. Tool rotate (background) while working, and the workpieces move (as a feed movement), workpieces can also be fixed, but at the moment, rotate tool must also move (at the same time to complete the main motion and feed motion).Milling machine has a horizontal milling machine or vertical milling machine, large gantry milling machine.The machine tool can be ordinary machine tool, can also be a nc machine tools. With rotating cutter as a cutting tool.Milling is generally conducted on milling and boring machine, suitable for processing plane, groove, all kinds of forming surface (such as spline gear and thread) and special shape mould surface, etc
The characteristic of the CNC Milling is:
(1) cutter blade periodically participate in continuous cutting.
(2) each blade in the process of cutting, cutting thickness is variable.
(3) each tooth feeding alpha f (mm/teeth), said cutter every turn a blade workpieces relative displacement of time.
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