Optimized Design Of A Certain Aero-engine Starter Generator System

The aircraft engine is started by hydraulic pressure,gas turbine,etc.,but it does not work after the engine is started,wasting a lot of space on the aircraft.With the development of science and technology,the power consumption of aircraft has also increased,and the space available for aircraft has also become smaller and smaller.Using starter-generator technology,the generator in the power generation system of the aircraft is used as a motor,and the engine is started when the engine is started.When the engine is running normally,the aviation starter generator is driven to generate electricity at high speed.The development of starter-generator technology eliminates the unique starting device of aero-engines,saves a lot of space in the aircraft,reduces the occupied space,system weight and cost,and is of great significance to the development of current aircraft starter-generator systems.Due to its high power density,high efficiency,small loss,and small size,permanent magnet synchronous motors have great advantages in aviation starter power generation systems,and are of great significance for the study of system miniaturization and light weight.At present,the low-power DC starter-generator system is a low-voltage DC startergenerator system.However,the low-voltage DC starter-generator system has mainly used a brushed DC starter-generator system.The system has a large weight and low efficiency.The system's requirements for light weight and miniaturization use permanent magnet synchronous motors to complete the optimized design of the system's small and light weight.The size and performance index requirements of the aviation starter generator design are analyzed by the miniaturized aviation starter-generator system.Motor design scheme of slot pole coordination,rotor structure and other parameters;and use electromagnetic simulation to adjust the determined motor structure to obtain the design of the starter generator;analyze the electromagnetic simulation results to verify the motor design scheme.When the stator structure of the designed motor is the same,the new motor is used to complete the optimized design of the designed starter generator,and the electromagnetic motor is used to optimize the design of the motor parameters such as the pole slot matching method,rotor structure and air gap size.Get the optimized design scheme of the motor of the miniaturized system And optimize the design of the strong and weak magnetic performance of the motor,through structural adjustment to improve the magnetizing ability of the permanent magnet synchronous motor.Realize the optimized design of aviation starter generator.Two optimization schemes were obtained,and a new motor optimization scheme was determined to compare with the previously designed motor scheme.The main structure of the motor core,housing,motor shaft,front and rear end covers,and magnetic steel pressure plate were completed for the requirements of light weight and miniaturization.Complete the module division of the controller hardware circuit.Aiming at the high current and serious heating problems of the low-voltage high-power system and the highfrequency control requirements of the system,complete the selection of the main components and build the design framework of the main module,that is,the drive power module,and complete the overall controller hardware circuit design.Optimize the control of large current and high frequency systems.The controller hardware circuit is divided into blocks,the controller three-phase current and bus current transmission and heat dissipation structure are designed to solve the problem of large current and severe heat generation of the system,and the overall structural design of the aviation starting power generation system is completed.Build an experimental platform for the aviation start-up power generation system,verify the controller hardware design through the basic debugging test of the motor;verify the design parameters of the motor through the static torque coefficient test experiment;through the start-up power generation and load test,the system is generating power Under no-load and on-load conditions,the current still shows a good sinusoidal waveform,and the voltage output is stable at 28 V.The overall system design is verified.