Translated Abstract
The switched reluctance machine with modular stators, composed of not an integral but several identical modules, implements the independence of the structure, circuit and magnetic path in the motor, and further enhances the fault tolerance and reliability of switched reluctance machines. As a result, the motor has a great potential application value in applications which require a more high reliability, such as the new energy vehicles and more-electric/all-electric aircraft. The paper aims at carrying out some researches on the electromagnetic characteristics and torque controls of the switched reluctance machine with modular stators.
Firstly, the main structure, characteristics of magnetic path, basic equations and the system composition are briefly introduced. Then combined with the design theories of traditional switch reluctance machine and finite element analysis method, it is designed that a switched reluctance machine with modular stators which has 6 E-shaped modular stators with double windings in each modular and 4 rotor teeth. The characteristics of static inductance and torque are obtained after the analysis and calculation in static magnetic field and the transient magnetic field by using the Ansoft software. Making use of the static inductance and torque characteristics, a simulation model of the drive control system is developed in Matlab/ Simulink based on the asymmetric power converter and the simulations are separately accomplished under the open-loop, speed closed-loop and open circuit fault in part windings. At the same time, the advantages and disadvantages between the switched reluctance machine with modular stators and the conventional switched reluctance machine are compared from the motor structure, cost, static electromagnetic characteristics and dynamic performance.
After analyzing the structure characteristics and the main operating state of Boost converter, a simulation model of the drive control system is developed in Matlab/Simulink based on Boost converter and the performance simulations are also separately analyzed under the open-loop and speed closed-loop. The comparisons of the simulations between asymmetric converter and Boost converter show that the latter has more fast dynamic response and load ability when compared with the asymmetric converter, thus the direct instantaneous torque control algorithm is applied to Boost converter for the reasons. The simulation results show that the direct torque control algorithm is able to effectively restrain the torque ripple and the experimental results also prove the correctness of the control model and algorithm.
The characteristics of static flux linkage is first measured and following the control system model based on asymmetric converter is built in a semi-physical simulation platform—dSPACE, and the experiments of starting, steady operation and open-circuit fault are executed separately under open-loop and speed closed-loop. Then the models of speed control system and torque control system based on Boost converter are built respectively, and open-loop and torque control operation experiments on a prototype are finished in succession. The experimental waveforms of main parameters such as voltage, current, speed, torque which are basis of asymmetric converter and Boost converter are measured and recorded. The experimental results prove the feasibility of system simulation model and control strategies.
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