In this paper a low-cost sensorless control strategy of SR motor is proposed. The static flux-linkage characteristics of the motor are used for estimating the position. A number of discrepancies between the static and the dynamic characteristics of the motor are explained. In this paper the issues regarding eddy effects and mutual inductances in both static and dynamic conditions, and their influence on position estimation, are discussed. Finally, the means of accurate estimation are proposed. Choosing the central region of flux linkage characteristics, adopting single-pulse operation throughout the speed range by means of voltage control, selecting appropriate phase for estimation, and introducing a correction factor 'Kc' (a function of voltage, speed and load) on static flux linkage, the sensorless operation is achieved. To implement the algorithm a TMS320c50 DSP platform is used. The controller was tested on a 5 hp 8/6 OULTON motor. Results of tests, and accuracy of position estimate are presented. The accuracy of estimated position is found to be within $pm1^o$. The proposed method uses only one phase voltage and one phase current for estimating the position.
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机译:本文提出了一种低成本的SR电机无传感器控制策略。电机的静态磁链特性用于估计位置。解释了电动机的静态和动态特性之间的许多差异。本文讨论了在静态和动态条件下有关涡流效应和互感的问题,以及它们对位置估计的影响。最后,提出了准确估计的方法。选择磁链特性的中心区域,通过电压控制在整个速度范围内采用单脉冲操作,选择合适的相位进行估算,并在静态上引入校正因子“ Kc”(电压,速度和负载的函数)磁链,实现无传感器运行。为了实现该算法,使用了TMS320c50 DSP平台。该控制器在5 hp 8/6 OULTON电动机上进行了测试。给出了测试结果以及位置估计的准确性。发现估计位置的精度在$ pm1 ^ o $以内。所提出的方法仅使用一相电压和一相电流来估计位置。
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