| Axial flux permanent magnet machines are known as machines with small size, compact structure and high power density. They have been widely used in electric vehicles and renewable energy systems where require high power density and high torque density, so the reliability and fault tolerance of such machines have been gained more and more attention. In this paper, a coreless axial flux permanent magnet machine is researched on the basis of the requirements of fault tolerant technology. The main contents are as follows:Firstly, the current development situation of axial flux permanent magnet machines and fault tolerance technology are summarized. According to the characteristics and performance requirements of the axial flux permanent magnet fault tolerant machine studied in this paper, the selection of appropriate topology, coil type and basic design parameters are finally determined. In addition, the electromagnetic field of this machine is calculated with the analytical method and finite element method to obtain the final design parameters and electromagnetic characteristics of this machine.Secondly, according to the mathematical model of this machine in normal state and fault state, the influence of fault on zero sequence voltage is analyzed. The detection methods of asymmetric fault and open circuit fault are proposed in this paper. Besides, the finite element method is used to verify the effectiveness of the proposed fault detection method.Finally, several different fault tolerant control strategies are proposed to improve the output performance of the machine in open circuit fault state, including the direct current control strategy, the optimal current control strategy and the control strategy based on constant magnetic motive force. Furthermore, the finite element method is used to verify the effectiveness of the proposed several fault tolerant control strategies, then performance comparison of different fault tolerant control strategies are completed. |
PDF Full Text Request