Investigation on Different Magnet Geometries and Slot-Pole Combinations in Inner-Hollow Outer Rotor Bldc Motors for Yarn Feeding Textile Machinery

This paper investigates the design and performance analysis of a high-speed, low-power Brushless DC (BLDC) motor designed for two-for-one twisting yarn feeding applications in textile machinery. The study explores various stator slot-pole combinations and different permanent magnet shapes to optimize efficiency within a compact design. The proposed motor features both inner hollow and outer rotor configurations, ensuring high efficiency while addressing the spatial and performance constraints of modern textile machinery. Given the industry's demand for high-speed operation and energy efficiency, multiple magnet shapes and slot-pole configurations were tested to achieve maximum efficiency within the available space. The motor is capable of reaching speeds of up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$18,000 \mathrm{r} / \min$</tex>, making it ideal for precise control in textile applications. Comprehensive simulations were conducted using ANSYS Maxwell and ANSYS Workbench to validate the design and performance. These analyses focused on key parameters such as magnetic flux distribution, torque, torque ripple, efficiency, and mechanical strength. Finally, a comparative study of different configurations is presented, with detailed analysis of the results to determine the most optimal motor design for textile machinery applications.