Brushless DC Motor Drive System Fed By Single-Sided Matrix Converter With Fault Tolerance Algorithm

As the development of aviation industry, the idea of "more electric aircraft(MEA)" become true. In the concept of MEA, special motors and its driving system get the attention of many researchers. Using electrical machine as the power source for flight control system can greatly simplify the power transmission system, and reduce the use of hydraulic pipeline, also reduce the weight of the plane. But to meet the strict requirement of safety and reliability, choosing a suited motor and driving system is essential.This thesis first analysed the advantages and disadvantages of several common motor types, and chose the brushless DC motor as the research object in this thesis. Then the common converters for BLDC. The use of the bulky DC capacitor in the common converter makes it unreliable in aeronautical environment. The Single Sided Matrix Converter(SSMC) is a novel matrix converter, which can fit the requirement of aeronautical environment very well. To get a better understanding of the characteristic of SSMC, a Matlab/Simulink simulation model has been built. The simulation results including the current and torque waveforms were presented.To improve the reliability of the driving system, this thesis proposed a novel fault tolerent algorithm for DoubleBand control, which can ensure partial or even all torque output of the motor, under single switch open circuit fault. The Matlab simulation was carried out to validate the algorithm.Base on the dSPACE hardware-in-the-loop simulation system, a BLDC driving system fed by SSMC was built. The system was assembeled and tested, using real SSMC hardware and virtual BLDC motor model is dSPACE.Finaly, the test results were proposed and analized. The result showed that the BLDC driving system still need to be improved. And a realistic BLDC motor and test rig need to be built to achieve better test results.