Control Strategy of the Electric Drive  for a Switched Reluctance Motor  with Improved Performance

Abstract

The switched-reluctance motor due to its advantages can be used in vehicles of low and medium power, as  a replacement for permanent magnet motors. However, at the moment, due to significant torque ripple, insufficient power density and driver complexity, it is not widespread. The article describes the structure of the switched-reluctance motor with a special C-shaped tooth structure of the poles of the stator and rotor located in a non-magnetic body, which has improved characteristics in comparison to the traditional structure, where the rotor and stator are completely made of soft magnetic materials. A special technique for the formation of the magnetic flux, by which a constant torque is achieved, is proposed for this switched-reluctance motor structure. The form of the stator winding current is given to ensure a given magnetic flux. Due to the high-frequency current generation, the dimensions of the motor are minimized. As a result, the basic requirements for the electric drive converter were formed. An analysis was made of popular solutions that can provide a given current shape with a steep edge and having high efficiency. As a result, the optimal structure and the algorithm for generating the current of the converter were determined. Since the engine operates at an increased frequency, a resonant converter was selected, which provides soft key switching, ensuring high efficiency.  Also, to increase the torque and engine efficiency, a two-section pole structure with the same number of sections on the rotor and stator using additional windings is proposed. The proposed structure and algorithm of the motor operation implies the operation of only one pole of the stator at a time, and as a result, only one electric drive can be used for the entire motor, which will switch between the poles using two-way keys. As a result, the proposed driver consists of only four resonant converters. The results of the switched-reluctance motor electric drive control system were tested in the MATLAB® Simulink® environment and, as expected in theory, the total force has no ripples. As a result, the developed electric drive has a simple structure with a minimized number of converter modules and requires only four modules, regardless of the number of stator poles. Due to the high-frequency method of forming the stator magnetic flux, the dimensions of the motor are minimized. As a result of using a resonant bridge converter, the dynamic losses are minimal. 

Keywords

References

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Copyright (c) 2020 Микола О. Лук'янов (Автор)