Study on the Noise Reduction of BLDC Fan Motor by the Diminution of the Electro-Magnetic Exciting Source

전자기 가진 원 저감에 의한 BLDC Fan Motor의 공진 소음 저감에 관한 연구

It is important to diminish noise source of an electric motor used in appliances. We studied on the noise reduction of BLDC motor to drive a fan. Especially, this study was focused on detent torque caused by interaction between a permanent magnet of rotor and groove in stator. This source and rotating system brought about a resonance. This paper showed that the higher harmonic component of this torque had a main factor to lessen noise. So, we had designed new magnets with shape like a peanut and pseudo-sinusoidal flux density for low-noise BLDC motor in refrigerator.