Self-Assembling Design Method of Stator Slots for AC Rotating Machines

To maximize the performance of rotating machines, it is essential to establish a design method with minimal arbitrariness. This paper proposes a self-assembling method to design stator slots for alternating current (AC) rotating machines. First, we develop a line-current approximation model of the stator winding using pulse-width modulation technique and realize an ideal spatial magnetic flux density distribution. Subsequently, we design the realistic stator with an acceptable current density of the winding by forming unique slot shapes in a self-assembling manner under two synthetic conditions using the developed line-current approximation model as the starting model. The designed stator realizes a rotating magnetic field similar to the conventional design results. Additionally, we perform an analysis of motor rotation characteristics by combining the self-assembled stator with a surface-mounted permanent magnet rotor to determine the possibility of a higher output compared to that when using a conventional stator. The self-assembled motor without relying on empirical rules shows a possibility of further improving the torque characteristics, thereby contributing to designing the AC rotating machines.