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 such common startup programs load directly slow start new efficient motors, 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, due to the size of the slip power load torque and the motor is proportional to slip efficient motor, the maximum slip power can still afford. Doubly Fed governor hoist startup mode hybrid mine hoist load characteristics and operating characteristics and fans, pumps and other traffic loads are very different type of energy-saving projects that benefit the efficient motors, main features: 1) speed control system requires frequent starts and stops A run cycle is generally only 1 ~ 2min; 2) large mechanical inertia, potential energy type load, heavy start, little relationship between the load torque and speed of the system; 3) In addition to the high speed governing system segment, as well as low-speed Crawling section, requiring the system is relatively large speed range. If the hoist is also used directly boot mode, you start early and crawling stage, converter slip to bear great power, require converter rated power capacity will be relatively large, relatively high cost of speed control system. 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. Permanent magnet motor will be the mainstream demand for a rare earth permanent magnet brushless DC motor due to the rare earth permanent magnet brushless DC motor unique advantages, its application in the aircraft speed is also accelerating. In the function and performance to a higher level in development. 2, rare earth permanent magnet motor limited angle torque motors that can directly drive the load within a certain range of angles do a quick movement and accurate positioning. Its characteristics are: to contribute in a limited angle large, fast, high precision, high reliability, small response, light weight. To the motor as the core can be composed of a special high-precision, high reliability servo system. 3, rare earth permanent magnet brushed DC motor Brush DC motor is still the most widely used of a motor on a plane in China. Although there are some inherent shortcomings of the motor, but because of its relatively low cost, mature technology, good characteristics, which still play an important role in a number of systems, and continue to seek technological progress. Using rare earth permanent magnet excitation can effectively improve the power density; using more than many of the forms to improve fault tolerance; precious metal alloy using multiple brushes and commutator Zhengzhou improve efficiency motor commutation performance, prolong life; to reduce the use of coreless armature structure moment of inertia. Load thrust 4, rare earth permanent magnet linear motor aircraft hydraulic servo valve, oxygen valve, emergency release valve, electric valves, engine throttle lever occasions such as linear motion is not large, the use of rotary screw worm mechanism or structure can only hope The rotary motion into linear motion, but not suited for aircraft fast acting valve high reliability, high frequency response and direct-drive performance requirements. 5, rare earth permanent magnet generator at home and abroad has grown 500 ~ 2000VA UAV rare earth permanent magnet synchronous generator series, 45 ~ 150kVA onboard power system with a large capacity of rare earth permanent magnet generator. In order to meet the growing aviation supply high quality standards demand, an adaptive complex rare earth permanent magnet generator excitation is gaining attention Treasury efficient motor home and abroad, Henan efficient motor, provided by the Zhengzhou Dresdner Dresdner Xiang Xiang Motor Manufacturing Co. . 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!