<p>The control performance of switched reluctance motor (SRM) is closely related to the accuracy of the detected phase current. The conventional phase current detection methods are mainly realized with analytical algorithm, high frequency pulse injection and split bus, and this will increase the complexity of the method. To avoid the problems, a phase current reconstruction method for SRM drive with dual current sensors is proposed. Firstly, the location of the current sensors is optimized according to the principle of alternate conduction of each phase winding in SRM. The multi-point current information is integrated to cover three phase currents, and each phase current is reflected in the detected value of the current sensors. Secondly, each electric period is divided into six subregions combining the turn-on angle and turn off angle. The current of each phase winding is reconstructed based on the relationship between three phase currents, the switching signals, and the detected currents in each subregion. Then the reconstructed phase currents are used for closed-loop control of SRM. The motor model and high frequency pulse injection can be avoided in the proposed method. Moreover, the modular characteristic can be maintained for the converter. The effectiveness is validated with simulations and experiments.</p>

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Speed Control of Switched Reluctance Motor with Novel Phase Current Detection Method

  • Wei Cheng,
  • Zheng Jia,
  • Yige Wang,
  • Dongsheng Yu,
  • Guoqiang Han

摘要

The control performance of switched reluctance motor (SRM) is closely related to the accuracy of the detected phase current. The conventional phase current detection methods are mainly realized with analytical algorithm, high frequency pulse injection and split bus, and this will increase the complexity of the method. To avoid the problems, a phase current reconstruction method for SRM drive with dual current sensors is proposed. Firstly, the location of the current sensors is optimized according to the principle of alternate conduction of each phase winding in SRM. The multi-point current information is integrated to cover three phase currents, and each phase current is reflected in the detected value of the current sensors. Secondly, each electric period is divided into six subregions combining the turn-on angle and turn off angle. The current of each phase winding is reconstructed based on the relationship between three phase currents, the switching signals, and the detected currents in each subregion. Then the reconstructed phase currents are used for closed-loop control of SRM. The motor model and high frequency pulse injection can be avoided in the proposed method. Moreover, the modular characteristic can be maintained for the converter. The effectiveness is validated with simulations and experiments.