System reliability and fault tolerance are very important features in safety-critical applications with electric motors. An inter-turn winding short circuit is one of the most common fault cases, which makes the fault-tolerant torque control a crucial task. In this paper, a novel fault-tolerant model-based torque control strategy for a three-phase permanent magnet synchronous motor (PMSM) with an inter-turn winding short circuit is proposed. The control scheme has a cascaded structure with a one-step model-predictive control (MPC) in the outer loop and subordinate PI current controllers. The control strategy is based on a magnetic equivalent circuit (MEC) model. Thus, magnetic saturation and non-fundamental wave behavior of the PMSM are systematically taken into account in contrast to existing works on this topic in the literature. The parameters of the inter-turn winding short circuit are identified by a model-based fault-identification method. The high torque control accuracy of the proposed control scheme is proven by a number of different experiments performed on a test stand.

系统可靠性和容错性在电动机对安全至关重要的应用中是非常重要的功能。匝间绕组短路是最常见的故障情况之一，这使得容错转矩控制成为至关重要的任务。本文提出了一种基于容错模型的匝间绕组短路三相永磁同步电动机转矩控制策略。该控制方案具有级联结构，在外环和从属PI电流控制器中具有一个一步模型预测控制（MPC）。该控制策略基于磁等效电路（MEC）模型。因此，与文献中有关该主题的现有工作相比，系统地考虑了PMSM的磁饱和和非基波行为。匝间绕组短路的参数通过基于模型的故障识别方法进行识别。所提出的控制方案的高转矩控制精度已通过在试验台上进行的许多不同实验得到证明。