Research On Fault Tolerant Control Of New Transverse Flux Permanent Magnet Motor

Transverse flux permanent magnet motor(TFPMM)can realize the decoupling of the circuit and the magnetic circuit in the structure.Because of the advantages of high torque density and good performance at low-speed,it has attracted widespread attention in practical applications such as wind power generation,ship transportation and other occasions.At the same time,the phases of TFPMM are independent of each other,which facilitates the construction of multi-phase structures.So it has obvious advantages in fault tolerance.Taking a four-phase TFPMM as the research object and on the basis of effective drive control,research on fault-tolerant control has been studied in this paper.This technology is of great significance for the practical application of TFPMM.First,based on the detailed introduction of the ontology topology of the four-phase TFPMM prototype,a mathematical model of TFPMM is established in this paper.Combined with the three-dimensional magnetic circuit,its operation principle is explained in detail.The operating characteristics of two typical single-phase fault states,which are single-phase winding open circuit and short circuit,are discussed to prepare for the research of fault-tolerant control strategies.Then,the hysteresis control strategy based on TFPMM is studied.Two-level and three-level hysteresis control methods are compared in this paper.The analysis shows that the three-level hysteresis control has obvious advantages in reducing the switching frequency and the harmonic content of the phase current.A double closed-loop control system is built and simulation in steady state,dynamic state and typical fault state is completed with Simulink.The validity of this double closed loop system for TFPMM is proved by the simulation results.Based on this,a dual-channel control system is built.The current sharing effect of the control system during the start-up and dynamic loading and unloading processes has been confirmed.And simulation analysis of the case of sampling errors such as speed and current between channels has been completed.The results show that the control system has a good control effect during fault removal.Finally,the software and hardware circuits of the dual-channel fault-tolerant control system are completed.The principles of hardware circuits and the functions and flowcharts of the software implementation are introduced in detail.A dual-channel fault-tolerant control experimental platform is set up.Experiments have been performed when TFPMM works steady state and typical fault state.The experimental results were recorded and analyzed to verify the fault tolerance of the system.