Electric Transfer Function Model of Switched Reluctance Motors and the Model-Based Current Control Design

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  • ＳＲＭの電気的伝達関数とそれに基づく電流制御系の設計法
  • SRM ノ デンキテキ デンタツ カンスウ ト ソレニ モトズク デンリュウ セイギョケイ ノ セッケイホウ

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Abstract

This paper presents a current control design for switched reluctance motors (SRMs). The electric transfer characteristic of the motors is studied first. Their transfer function is brought out to be represented by a pure resistive component, which is not constant but varies depending on the motor current and speed. The current control design for SRMs follows the classical design technique used for dc machines, where the zero of PI controller cancels the pole of Ls+R. Because the transfer function of SRMs does not have any poles, an I controller is suitable for them. The integral gain should be adjusted in order to compensate the non-linearity, that is, the variation in the equivalent resistor of the SRMs' transfer function. The values of the integral gain are tuned and tabulated for the motor speed and current. Simulation and experiment demonstrate that the current and speed of the SRMs presents good responses without dependence on the motor speed and current.

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