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

高度动态的异步电机，例如用于测试和生产设施的电机，其特点是扭矩变化非常频繁，其中一个循环也可能只包含一次转数。这需要一个低惯性矩的结构，最重要的是，与其他机器相比，大量增加的热损失必须安全移除。该项目的目的是研究一种新的冷却系统与空气径向引导通过转子和定子提供如此强烈的热量去除。转子和定子通道通过间隙耦合，流经转子的流动发生完全反方向，导致了复杂的现象。其次，新颖的设计和高度动态的运行导致复杂的机电条件，必须理解和控制。研究设计、机电、热、流体机械和应用决定方面之间的相互作用需要跨学科的方法，这是由两位申请人的合作实现的。来自电机领域和流体力学领域的系统工具以一种完全协调的方式结合起来，以研究不同长度尺度上的现象。这范围从作为参考实验的磁盘模型，辅以高分辨率的流细节模拟，到一个示例机器的网络模型，它允许在数值演示的意义上评估概念。这个基础项目的目的是详细了解与新型冷却概念相关的多物理现象，进行全面评估，并明确说明工业应用前景。

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.