Topology of Low Noise Polygonal Slotless BLDC Motor Designed for High Volume Production

Abstract

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