Variable flux memory machines (VFMMs) normally suffer from excessively low initial magnetization state (MS), which will cause a large starting current or even startup failure. This article proposes an MS initialization control scheme for VFMMs equipped with incremental encoders, in which the required rotor position is estimated by injecting high-frequency square-wave voltage. Based on the estimated initial rotor position, the MS initialization can be accurately and smoothly achieved by applying a ${d}$ -axis current pulse. The general framework of the proposed scheme is demonstrated first. The voltage pulse magnitude determination of the bipolar injection method is then particularly discussed to realize the polarity detection within a full flux regulation range. The implementation of the ${d}$ -axis current pulse injection method for the MS initialization based on the estimated rotor position is subsequently introduced. Finally, the feasibility and effectiveness of the proposed MS initialization control scheme are experimentally verified on a manufactured VFMM prototype.

中文翻译：

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一种无需位置传感器信息的可变磁通记忆机磁化状态初始化控制方案

可变磁通记忆机 (VFMM) 通常会遇到过低的初始磁化状态 (MS)，这会导致启动电流过大甚至启动失败。本文提出了一种用于配备增量编码器的 VFMM 的 MS 初始化控制方案，其中通过注入高频方波电压来估计所需的转子位置。基于估计的初始转子位置，可以通过应用一个 ${d}$ -轴电流脉冲。首先展示了所提出方案的总体框架。然后具体讨论了双极注入法的电压脉冲幅度确定，以实现全通量调节范围内的极性检测。的实施 ${d}$ 随后介绍了用于基于估计转子位置的 MS 初始化的 轴电流脉冲注入方法。最后，在制造的 VFMM 原型上通过实验验证了所提出的 MS 初始化控制方案的可行性和有效性。