A topology of low noise polygonal slotless BLDC motor designed for high volume production

The noise is a key asset for air management applications. The use of slotless motors is a good solution to mitigate the noise due magnetic forces on teeth. In this paper we propose a topology of slotless motor with toroidal winding that enables to reduce the noise and that simplifies the manufacturing. With prototypes of this technology, we have been able to reduce the acoustic noise of 5 dB in comparison with existing classical slotted motors.