Slotless windings are commonly used in small size high-speed electrical brushless dc machines. Unlike slotted windings, forced to follow the direction of slots, slotless windings can be freely arranged in the airgap. This represents several opportunities for optimization. Nevertheless, very little research is performed in this domain. This article intends to challenge the traditional way of manufacturing windings. Indeed, most of the windings are made with isolated wire of constant section. However, it is demonstrated here that the performances of a motor can be significantly increased by optimizing the shape of the winding and by selecting nonconstant wire sections. A prototype of the new topology has been manufactured and measurements have demonstrated an increase of the motor constant from 18% to 24% compared to a traditional slotless winding.

中文翻译：

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BLDC 电机中无槽绕组的新型优化形状和拓扑结构

无槽绕组通常用于小型高速无刷直流电机。与有槽绕组被迫遵循槽的方向不同，无槽绕组可以在气隙中自由排列。这代表了几个优化机会。然而，在这个领域进行的研究很少。本文旨在挑战传统的绕组制造方式。事实上，大多数绕组是由恒定截面的绝缘线制成的。然而，这里证明了通过优化绕组形状和选择非恒定线段可以显着提高电机的性能。新拓扑的原型已经制造出来，测量结果表明，与传统的无槽绕组相比，电机常数从 18% 增加到 24%。