Direct torque control switched reluctance electric machines in braking mode

Flexible combination of driving and braking modes of a valve-inductor electric machine (VIEM) is required to provide high-quality control of a driven mechanism. VIEMs differ from conventional electric drives; therefore, they cannot be designed using known technical solutions. Currently, the methods and algorithms for computing VIEM motion modes are best developed. In this paper, the challenges of implementing VIEM braking modes are discussed. A new algorithm for the direct instantaneous torque control that can significantly improve the drive characteristics during braking is proposed. Mathematical simulation procedures were used to analyze the change of basic parameters in the direct torque control when switching over adjacent phase pairs according to the proposed algorithm. The efficiency of the proposed control algorithm is proved using the drive simulation model as an example. Probable causes of algorithm failures are analyzed, and measures to eliminate them are proposed. The results of study can be used when designing electric drives of various mechanisms with special requirements to their dynamic characteristics, structural simplicity, and reliability.

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