With the upgrading of the overall level of domestic manufacturing, cost consciousness has gradually become the consensus of various industries, because this is directly related to the survival and development of the company. Since the electric drive is the main energy-consuming device in the manufacturing industry, the space occupied by the control cabinet is also relatively large. Therefore, the choice of the drive technology for the enterprise also determines the level of production cost. In addition, “ energy-saving wind †is prevalent in the world, and the inverter is This demand has gradually developed. Textiles, elevators and other industries are the traditional industries of inverter applications. With the guidance of the development directions of these traditional industries, many new features have appeared in the application of frequency converters. In these fields, the inverter products at home and abroad can be described as “a hundred schools of thought contend †and the competition is very fierce. How to stand out in the “ Red Sea market †, the inverter manufacturers have been painstakingly engaged in new technologies and concepts. We specially invited Zhu Wubiao, Chief of Electrical Engineering, Product Development 2 of Shanghai Mitsubishi Elevator Co., Ltd., and Lu Heqing, Chief Engineer of Shanghai Second Textile Machinery Co., Ltd., and asked them to introduce how “ Blue Ocean Innovation †is implemented in the elevator and textile industries. Is the inverter universal or dedicated? It is understood that at home and abroad in the elevator industry, miscellaneous escalators, escalators, moving walkways also use a large number of non-frequency conversion technology, and other elevator products are almost all using VVVF frequency conversion technology. Zhu Wubiao introduced that in the industry generally discussed the elevator " frequency conversion system " has two major factions: Among them, large-scale enterprises basically use discrete components to assemble the elevator-specific frequency conversion system, that is: in a certain space of the control cabinet, relatively separate installation of power modules, large Capacitance and drive control printing plates are integrated with the entire control system. Another faction is that individual large-scale enterprises and the vast majority of SMEs use universal inverters. This inverter is a completely independent device that can be purchased independently from a dedicated inverter manufacturer. When it comes to the advantages and disadvantages of dedicated inverters and general-purpose inverters, Zhu Wubiao believes that it is difficult to have an exact answer to this question. He said: " In China, Mitsubishi Elevator, Kone Elevator, Toshiba Elevator, Otis Elevator, Hitachi Elevator and other companies are using a discrete elevator-specific frequency conversion system. And XIZI-OTIS and some small and medium-sized elevators Most companies use general-purpose inverters. " At the same time, for the application prospects of both, Zhu Wubiao also gave his judgment: “ Special frequency converters are mostly developed by elevator manufacturers, so it is easy to exchange information with their control systems (elevator control systems). The seamless connection between the elevator control system and the drive system is of great significance for the safety and reliability of the elevator.In addition, since the dedicated inverter device is assembled separately, if a certain inverter component is damaged, only the replacement of the element is required. The device can, maintenance costs are relatively small, and for general-purpose inverters, because of limited input and output interface resources, the exchange of information with the elevator control system is limited, and if a component of the universal inverter is damaged, Basically, it is necessary to replace the entire inverter, and its maintenance cost is higher. " But he also stressed that due to the discrete nature of the special inverter, its electromagnetic compatibility may be relatively poor, and the general inverter can be done due to the integrated design. To better electromagnetic compatibility; In addition, due to the versatility of general-purpose inverters, their production costs may be Low, and for SMEs, we have greater purchasing choice and opportunity to shop around. Inverter product performance should pay attention to details The ever-changing frequency inverter technology has become more and more closely related to industry needs. Some experts have analyzed: The new generation of inverters must first be fully digitalized, especially distributed with communication and networking functions and with programmable functions; industry-specific frequency conversion The size of the device needs to be miniaturized; networkization and systemization will reduce production costs, and this trend is also very clear. But in the industry, are these requirements not what users need most? Lu Heqing introduced that in his Shanghai Second Textile Machinery, inverters have been widely used in various spinning processes. Light from the cotton spinning industry includes carding machines, combers, draw frames, roving frames, and spun yarns. Machines, automatic winders, etc. have all been used in frequency converters. At present, in the textile machine type of Shanghai Second Textile Machinery, the application range of the frequency converter has basically reached more than 80 %. Due to the use of a frequency converter to control the main motor, the maximum potential of the motor can be tapped to exploit the reactive power of the motor, and the power factor can be fully utilized and improved so as to achieve energy saving. At the same time, frequency conversion speed control will strengthen the mechanical and electrical integration of textile mills, realize on-line inspection, display and control, improve the control accuracy of the process, and ensure good product quality. Therefore, in addition to a small number of old-fashioned models, the frequency converters are widely used in all conventional and new models of Shanghai Second Textile Machinery. He stressed that from the user's point of view, the cooling performance of the inverter is a more prominent problem. Due to the high ambient temperature of textile mills, the humidity changes of different types of spinning processes. When spinning low-count yarns, yarn cotton flocculation is very serious. This requires the textile equipment to be able to operate stably with an ambient temperature of 40 °C and an electrical cabinet temperature of 60 °C or higher and without alarm. At present, the environmental sanitation of ordinary small and medium-sized textile mills is not ideal. When an engineer opens the electric cabinet, the inverter is often covered with a large number of layers of batting. This requires the inverter to have a lower heat output and better heat dissipation capacity. . In terms of elevators, safety performance is always the first factor. Zhu Wubiao believes that inverter products will be more reasonable in electromagnetic compatibility, making it less and less disturbing to the outside world. At the same time, more energy-efficient matrix frequency conversion will gradually be applied to various industrial motor control areas including elevators due to its improved reliability. Inverter " Blue Ocean Innovation " needs to consider the needs of the industry The inverter application area is not only the elevator and textile industries, but its development represents the technical progress in the entire drive control field. Zhu Wubiao introduced that in the elevator industry, inverters will develop into large-capacity areas, and low-power applications will become more common; the power consumption of power devices and inverters will become smaller and smaller, and the energy efficiency of inverters will increase. The inverter with energy feedback function will gradually be popularized in the field of elevators. Inverters using large-capacity energy storage devices such as super capacitors will also appear in the field of variable frequency drives for elevators. Lu Heqing believes that in the textile industry, frequency conversion and drive technology are currently moving toward new technologies such as multi-axis synchronous drive drives and fieldbus networked control. A frequency converter has been able to simultaneously control multiple axes for precise synchronous operation. However, it cannot be ignored that there is still a certain failure rate during long-term operation, and its stability and reliability still need to be improved. In addition, Zhu Wubiao also mentioned the combination of frequency conversion technology and control technology - integrated controller. The appearance of this product makes the elevator control system (including elevator drive and control management system) highly integrated, which is conducive to the miniaturization of the elevator control system, saves space, and is also conducive to the production of elevator control systems for non-elevator plant Technological progress. However, Zhu Wubiao emphasized that this “ integrated control †idea should be a trend for relatively small-sized elevators. For larger elevators such as medium and high speed elevators, this is not necessarily feasible due to the large system capacity. At the same time, in terms of performance, Zhu Wubiao believed that it is necessary to pay attention to the high reliability of the integrated control system and the convenience and low cost of future maintenance.