The domestic present situation and development trend of servo drive

In the early 1980 s in China by introducing, digesting and absorbing foreign advanced technology, and in the country during the seventh, eighth, ninth of servo drive technology major project of science and technology research have made great achievements. But due to reasons such as product reliability, restricts the matching and application of nc machine tools in our country, thus affecting the development of equipment manufacturing industry in China. Some machine tool manufacturers also have to choose servo system in foreign countries, makes the home-made numerical control machine tool in terms of price, delivery time, reliability, etc are not dominant, and no more heart development and market demand of new varieties, and lose a significant market share. From the perspective of the statistical data of public, more than 75% of the faults in the CNC system by servo. In recent years, however, constantly organize scientific research in the country at the same time, some private high-tech company also has injected new vitality for the development of servo drive technology in China. For example, a company in the country under the condition of not spending a penny, market-oriented, constantly develop new products, developed in 1994 PDC series dc servo system, the torque from 1 n & middot; M to 44. 1 n· M a total of seven specifications wide speed of dc servo motor, using the latest generation of international power device & ndash; — IPM, PWM control, modulation frequency 15 KHZ, effectively overcome the traditional SCR generated by the discontinuous control current commutation spark ablation for commutator, can make the carbon brush life span more than one times. At the end of 1997 the company developed and PAC series ac servo system, and lanzhou motor factory introduce Germany Siemens company 1 ft5 series 94 specifications of the brushless ac servo motor. Series speed 1200 r/min, 2000 r/min and 3000 r/min, 4000 r/min and 4500 r/min, 6000 r/min, the torque range 0. 15 ~ 90 n· ； In November 2000, according to the market demand, develop the PAC - P series digital position servo system. After these products to the market, has achieved good social benefits and economic benefits, make Beijing first machine tool plant, precision instruments, tsinghua university, the first machine tool plant in qinghai and other manufacturers, and XA5750 ram milling machine, XA718 2410 gantry milling machine and vertical milling machine, XA2412 / XKA5032 nc vertical milling machine, CNC screw milling machine, special XKA8132/8140 CNC milling machine and other supporting. In addition, also used in composites molding machinery, car radial tire one period, two period of forming and cutting machines, satellite wind tunnel group control, electronic components materials cutting, braid and other fields. At present, nearly 200 units used in the domestic each big car radial tire production line, continuous operation 24 h a day. In addition to the application in domestic, starting in 1997, the company partial products by Beijing first machine tool plant supporting exported to Germany, Canada, Australia and other countries. Since 1994 sold nearly 1000 sets of ac/dc servo system, a few years to none machine repair, according to the company to record figures, only 8 units are due to wrong wiring user insurance resistance, power supply circuit, and interface components burn out. Use treasure Aaron in the product user to change the perception of domestic servo system reliability is bad. Huazhong CNC system co. , LTD. , mount Everest, aerospace CNC numerical control company, inc. , the Chinese Academy of Sciences DianGongSuo unit through the implementation of the national science and technology research projects, such as are supplied to the machine tool factory own numerical control system of servo system, you need also applies to some old equipment technical reform. Luoyang bearing research institute of independent research and development of high speed motorized spindle, has been applied in bearing grinding machine, PCB milling, drilling, etc.