Noise and vibration characteristics of sub-fractional horsepower single-phase BLDC drives

Abstract Single-phase brushless DC (BLDC) drives are a cost-effective alternative for three-phase sub-fractional horsepower in automotive auxiliary applications. Inherent features of single-phase permanent magnet machines, such as high cogging torque and ripple, can, however, make them more audible than their counterparts. As some these close to the passengers, where even small amount noise can be disturbing, investigation into sources is essential further address this challenge. In paper, dominant vibration characteristics BLDC machines investigated two different stator structures, i.e., salient-pole claw-pole, compared. Magnetic force density waves finite element (FE) analyses performed analyze electromagnetic forces resulting from open-circuit condition well switching strategies load condition. Structural show that due mechanical structure’s lower stiffness natural frequencies range, example case machine with claw-pole develops higher structure- air-borne stator.