Airborne High-voltage High-power Brushless DC Servo System Research And Design

The paper comes from supporting aircraft developed for a power-driven equipment, focusing on high-pressure based (270V) power12.7kW power brushless DC servo system driver implementation techniques were studied.First, this paper describes the characteristics, application and development of brushless DC motors, permanent magnet elaborated role in promoting the development of rare earth materials for motors, analyzes the advantages and disadvantages of the three types of controllers. Analyzes the necessity and significance of high-pressure air power servo system developed.Secondly, the steady-state performance of the motor body, the basic dynamic equations were analyzed for motor body design provides a theoretical basis, completed the rotor structure design, developed a two-phase conduction star three-phase brushless DC motor design six states solution.Thirdly, the complete design of the hardware circuit of the servo control unit Use analog circuit control simple and strong anti-interference ability of the advantages to achieve PWM generation, given the speed, logic synthesis and processing feedback current cut-off function, while the choice with fast processing speed computing capability of a digital circuit to achieve a current, speed double-loop ensuring high-precision control systems. Circuit design to achieve a position detection system, power driver and current sampling circuit protection, rectifier power supply, auxiliary power supplies and dual redundant circuit design major given the speed and current dual-closed-loop control method. Use of software engineering methods, software control strategies were composed of modular design and software to ensure that the program is easy to write, easy to understand, easy to test, easy to modify and easy to maintain.Fourth, completed the development of prototype products, and through the system start-up, double-loop simulation runs with a double-loop simulation and negative feedback current cut-off, and the related testing and performance testing are compared to verify the main technical indicators meet the design requirements.At present, the products have been successfully aviation aircraft with a certain type of large-scale research and test work completed. The results showed that:this thesis with high pressure (270V) the successful development of high-power brushless motor, the main technical indicators have reached or exceeded the design requirements, which is to promote the application of the next generation of aircraft has laid a solid foundation.