Purpose

This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed.

Design/methodology/approach

First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third, the whole-region rotor position and real-time rotational speed can be updated four times for the improvement of detection accuracy. Finally, the fault-tolerant control strategy is performed to enhance the robustness and reliability of proposed sensorless scheme under faulty conditions.

Findings

Based on proposed sensorless control strategy, the estimated rotor position is in good agreement with the actual rotor position and the maximum rotor position error is 1.5°. Meanwhile, the proposed sensorless scheme is still effective when the motor with multiphase loss and the maximum rotor position error is 1.9°. Moreover, the accuracy of the rotor position estimation can be ensured even if the motor is in an accelerated state or decelerated state.

Originality/value

The proposed sensorless method does not require extensive memory, complicated computation and prior knowledge of the electromagnetic properties of the motor, which is easy to implement. Furthermore, it is suitable for different control strategies at low speed without negative torque generation.

中文翻译：

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低速开关磁阻电动机的无容错无位置估计方案

目的

本文旨在提出一种具有容错能力的新型低速开关磁阻电机无位置传感器控制方案。

设计/方法/方法

首先，在每个相的续流和空转间隔中注入检测脉冲。其次，可以通过比较检测电流的连续上升时间来检测各相的对准位置。第三，可以四次更新整个区域的转子位置和实时转速，以提高检测精度。最后，执行容错控制策略以增强所提出的无传感器方案在故障条件下的鲁棒性和可靠性。

发现

基于提出的无传感器控制策略，估计的转子位置与实际转子位置非常吻合，最大转子位置误差为1.5°。同时，当电动机具有多相损耗且最大转子位置误差为1.9°时，所提出的无传感器方案仍然有效。此外，即使电动机处于加速状态或减速状态，也可以确保转子位置估计的精度。

创意/价值

所提出的无传感器方法不需要大量的存储器，复杂的计算以及电动机的电磁特性的先验知识，这是易于实现的。此外，它适用于低速下的各种控制策略，而不会产生负转矩。