Reducing the Noise and Vibration of the BLDC Motors’ Stator by Shifting its Natural Frequencies to Higher Values

Document Type : Original Article

Abstract


Regarding the necessity of low noise and low vibration operation of the BLDC motors in some especial
applications, a novel method is proposed in this paper in order to shift the natural frequencies of a BLDC
motor’s stator to higher values. Therefore the noise and vibration of the  structural resonances can be reduced
since the electromagnetic excita tion forces in the BLDC motor have lo wer magnitudes at higher frequency
components. The proposed method is  based on placing a single hole, with definite diameter and location, on
definite regions of the stator cross sectional area (each  region contains one stator  tooth and its upper parts in
the stator’s yoke). The frequency analyses have been  done in the SolidWorks software environment and the best
diameter and location of each hole is  extracted by the Response Surface Methodology (RSM).Preventing the
magnetic saturation of the stator structure and the  motor cogging torque enhancement prevention are
considered as constraints for the  problem. The new method also can be  used for other types of electrical
machines’ stator. 

Keywords


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