Three of China's small motor to the motor manufacturing industry as a kind of electrical energy into mechanical device, which is widely used in metallurgy, electric power, petrochemical, coal, mining, building materials, paper, municipal, water conservancy, shipbuilding, ports, food processing machinery and other fields. Universal motor gradually specificity direction, breaking the previous situation the same motors are used to different load types, the use of different occasions. China's motor industry after 40 years of development, especially the reform and opening up 20 years of rapid development, small motor manufacturing industry has begun to scale, standardization and automation direction, while medium-sized motor manufacturing industry has continued to increase unit capacity, requirements specialization, diversification, customized direction. Has made considerable progress. According to the Institute for Prospective industry released "2014-2018 China motor manufacturing industry, market demand and investment planning analysis report" shows: the rapid development of new energy sources led to the rapid growth of the stepper motor industry, the development of China's motor industry prospects. At the same time, I believe that the development trend of energy-efficient but also the entire motor industry, small motor manufacturing industry will go along three major development. A professional, specialized, personalized with the continuous development of the motor industry, extension and intension electrical products has been expanding, electrical products are widely used in metallurgy, electric power, petrochemical, coal, mining, building materials, paper, municipal, water , shipbuilding, port handling and other fields. Universal motor gradually specificity direction, breaking the previous situation the same motors are used to different load types, the use of different occasions. Motor forward dedicated, special, personalized direction. Second, the product unit capacity is increasing with the gradual increase of modern industrial production scale, with the support of the production equipment is toward integrated, large-scale, large-scale direction YEZ tapered motor, motor drag large machinery and equipment power also growing, high-voltage, high-capacity, high-performance motor to become the most important direction. Low motor speed converter to bear a larger slip power standard double-fed speed regulation system startup mode direct current, double-fed speed control technology is more mature speed fans, pumps and wind power systems, which class traffic type is loaded with practical applications in several distinct features: 1) a non-frequent start-stop speed control system, is not strictly limited to start acceleration; 2) load torque and motor speed related, low-load torque is small; 3) speed range of the normal operation of the system is not required, generally within ± 15% ~ ± 30% range. Double-fed speed regulation system common startup programs such load is a direct motor slow start, there is also an auxiliary rotor winding string resistance started. The advantages of these two start control system architecture program is relatively simple; the downside is to start early in the system, due to the low speed of the motor, converter slip is subjected to greater power. However, since power is proportional to the size of the slip load torque and the motor slip, slip maximum power can still afford. Hoist load characteristic double-fed speed mixed mine hoist startup mode and operational characteristics and fans, pumps and other flow-type loads are very different, mainly: 1) speed control system requires frequent stops, an operation cycle generally only 1 ~ 2min; 2) large mechanical inertia, potential energy type load, heavy start, not the load torque and system speed relationship; 3) In addition to the high speed governing system segment, as well as low-speed crawling segment system requirements speed range is relatively large. If the hoist is also used directly FX textile motor startup mode, you start early and crawling stage, converter slip to bear great power, require converter rated power capacity will be relatively large, the cost comparison of speed control system high. Therefore, hoist double-fed speed regulation system is preferable to use single and double-fed mixed start mode: In the early stages of start-up and slow speed converter using single feed, that the normal frequency control mode, the high-speed operation using the standard double-fed Speed ??Run mode. YE2 motor motor _ _ Allianz Dresdner Xiang Xiang is provided by Motor Manufacturing Co., Ltd., Zhengzhou. Zhengzhou Dresdner Cheung Motor Manufacturing Co. (www.deshengxiangmotor.com) strong, credible, in Zhengzhou, Henan Province of asynchronous motor industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Dresdner innovative ideas will lead you hand into the brilliant harmony for a better future!