Sensorless Control Technology Research Of SRM Based On High Frequency Signal Injection

With the characteristics like the simple mechanical structure and low made cost,SRM could run in the bad working environments due to the particular mechanical structure and strong fault-tolerant capability. Its control system is one of the most popular research subjects, the static and dynamic performances of which are great.However, the traditional position sensors SRM system with position sensors will be replaced to suit the development direction of integration, automation and miniaturization. Therefore, in view of this problem, the relative inductance position estimated method based on three-phase sine high frequency injection method without the SRM parameters was put forward in this paper, which was used to get rotor angle position. It is more simple and convenient.First of all, the SRM development process was briefly introduced. The sensorless technology research direction of the high frequency injected method was determined by the control system analysis and the related study of PMM.Secondly, the deep theoretical research of the controlled object SRM was done in this part. Not only expounding the mechanical structure, electrical principles,mechanical-electrical connection, operation features and control strategies, but also introducing three kinds of common mathematical SRM models. The SRM nonlinear modeled testing method was established by combining the two flux information retrieval methods-finite element analysis and testing methods. The basic preparations of control system design were also done here.Then, the relative inductance method without motor model in this paper was put forward based on the SRM sensorless control technology research of three-phase sine high frequency signal injection arctangent method. The angle position estimated principle, reference phase error analysis and the influence of asymmetric three-phase inductance of this method were deeply analyzed here. When at static or inertial condition, the high frequency response current amplitude information was got by Fourier analysis to gain three-phase relative inductance curve. Rotor position was calculated through the angle position estimated principle of relative inductive method,where voltage detection and flux linkage calculated were not need. When at load condition, it was difficult to gain the high frequency current due to the addition of working current. Therefore, rotor position was estimated by real inductance, which was got by flux linkage-current relationship.The simulation analysis was done underdifferent working conditions based on Matlab. The system was improved based on the simulation results, and the feasibility of the proposed method was verified here.Finally, the PC program was designed combining the 18.5 kW SRM experiment platform. The proposed method was analyzed by the static, inertial and load experiments, the proposed method was verified by tests. The correctness and precision of the relative inductance high frequency injection method was proved.