Rotor cooling of low-inertia induction machines for highly dynamic applications

高动态的电动异步电机，如用于测试和生产设施的电机，具有非常频繁的扭矩变化的特点，其中一个周期也可能只包括一次旋转。这需要一个低转动惯量的结构，最重要的是，与其他机器相比，必须安全地移除大量增加的热损失。该项目的目的是研究一种新的冷却系统，通过转子和定子径向引导空气，提供如此强烈的散热。转子和定子通道通过间隙耦合，转子内的流动发生完全反转，导致复杂的现象。其次，新颖的设计和高度动态的操作导致了复杂的机电条件，也必须了解和控制。研究设计、机电、热、流体机械和应用决定的方面之间的相互作用需要一种跨学科的方法，这是通过两个申请者的合作实现的。来自电机领域和流体力学领域的有条不紊的工具以完全协调的方式结合在一起，以研究不同长度尺度上的现象。这一范围从作为参考实验的磁盘模型，辅之以流动细节的高分辨率模拟，到允许在数值演示意义上评估概念的示例机器的网络模型。这个基础项目的目的是详细了解与新的冷却概念相关的多物理现象，全面评估，并清楚地说明工业应用的前景。

Highly dynamic electric asynchronous machines, such as those used in testing and production facilities, are characterized by extremely frequent torque changes, where a cycle may also comprise a single revolution only. This requires a construction with a low moment of inertia, and above all, the massively increased heat loss compared to other machines must be safely removed. The aim of the project is to investigate a new cooling system with air radially guided through rotor and stator providing such an intense heat removal. Rotor and stator channels are coupled via the gap, and the flow through the rotor occurs with complete reversal of direction, which leads to complicated phenomena. Second, the novel design and the highly dynamic operation result in complex electromechanical conditions that must be understood and controlled as well. The investigation of the interaction between design, electromechanical, thermal, fluid mechanical and application-determined aspects requires a cross-disciplinary approach, which is realized by the collaboration of the two applicants. Methodical tools from the field of electrical machines and from the field of fluid mechanics are combined in a thoroughly coordinated manner to investigate phenomena on different length scales. This ranges from a disk model as a reference experiment, supplemented by highly resolving simulations of flow details, to a network model of an example machine, which allows the evaluation of the concept in the sense of a numerical demonstrator. The aim of this fundamental project is to gain a detailed understanding of the multi-physical phenomena associated with the novel cooling concept, an overall evaluation, and a clear statement on application perspectives for industrial use.