Purpose

This study aims to design the rotor geometry of switched reluctance motor (SRM) in a completely flexible way. In the proposed method, there is no default geometry for the rotor. The initial geometry of the rotor can start from a circle or any other shape and depending on the required performance takes the final shape during the optimal design. In this way, the best performance, possible with geometric design, can be achieved.

Design/methodology/approach

The rotor boundary of a 4/2 SRM is defined by a few B-splines. Some control points are located around the rotor and changing their locations causes customized changes in the rotor boundary. Locations of these points are defined as design variables. A 2-D finite element analysis using MATLAB/PDE is applied to the SRM model and sensitivity analysis is used to optimization design by means of minimizing of objective function.

Findings

The proposed method has many more capabilities for matching different objective functions. For the suggested objective function, while the conventional rotor torque profile difference with the desired torque profile reaches 40%, this difference for B-spline rotor is about 17%. Experimental results from a prototype motor have a close agreement with analysis results.

Originality/value

The B-splines have been used to design machines and electromagnetic devices. However, this method is used for the first time in design of the whole rotor of a SRM.

中文翻译：

---

使用B样条曲线的开关磁阻电机的定制形状优化

目的

这项研究旨在以完全灵活的方式设计开关磁阻电动机（SRM）的转子几何形状。在提出的方法中，转子没有默认的几何形状。转子的初始几何形状可以从圆形或任何其他形状开始，并根据所需性能在最佳设计过程中采用最终形状。这样，可以实现几何设计可能的最佳性能。

设计/方法/方法

4/2 SRM的转子边界由一些B样条曲线定义。一些控制点位于转子周围，改变其位置会导致转子边界发生自定义更改。这些点的位置定义为设计变量。将基于MATLAB / PDE的二维有限元分析应用于SRM模型，并通过最小化目标函数将灵敏度分析用于优化设计。

发现

所提出的方法具有更多的能力来匹配不同的目标函数。对于建议的目标函数，虽然常规转子转矩分布与所需转矩分布的差异达到40％，但B样条转子的这一差异约为17％。原型电动机的实验结果与分析结果非常吻合。

创意/价值

B样条曲线已用于设计机器和电磁设备。但是，这种方法是在SRM整个转子的设计中首次使用。