This method can realize the initial position estimate of SRM under standstill and inertia status ,it is quite easy to implement, the proposed method not only reduces the initial position estimation error due to improve the reliability of motor starting, and realize motor running of no inversion. The simulation and experimental results verify the correctness and feasibility of the proposed algorithm. | Journal of Automation and Control Engineering Vol. 5, No. 2, December 2017 A Initial Position Sensorless for Switched Reluctance Motor Based on the Improved Pulse Injection Lei Zhang1,2 and Zhi Xin1 1. 2. College of New Energy, Nanjing College of Information Technology, Nanjing, China College of Electronic Engineering, Nanjing Xiao Zhuang University, Nanjing, China Email: zl_srd@, z_sans@ estimation of SRM is studied [4]-[11]. The high frequency pulse is injected for each phase winding at the same time [4]-[7], the initial position is estimate d by comparison of the peak value of the pulse current, the algorithm is simple, but in the maximum and minimum area, the inductance change slightly, the peak value of pulse current variation is small, the position estimation error magnify. Based on literature [4]-[7], The robust analysis is proposed for improve the accuracy of position estimation [8], the selection of testing phase was obtained , but the algorithm is complex . The initial position estimation method is proposed by compare pulse current peak value with the current threshold [9], the method is simple and easy to implement. The initial position of the SRM is estimated by the relationship between the time of the bootstrap circuit capacitor charging current amplitude and the phase inductance [10][11], the capacitor selection is difficult，not to realize the control operation of the motor start. The full cycle inductance method is proposed to realize the initial position estimation, and the starting control of the no position sensor, the fault tolerance is also studied [12]. The inductance vector and orthogonal decomposition is proposed [13] , the three-phase inductance are estimated by voltage equation, the rotor initial position angle is obtained by the arctangent value based on the orthogonal decomposition .But did not discuss the arctangent value range, did not research on the method of operation on startup. The initial phase is estimated by .
