Browsing by Author "Huang, Chung-Chun"

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Axial Vibration Study of a Mobile Fan Motor
(2010-06-01)
Wang, Chien-Chang
;
Yao, Yeong-Der
;
Liang, Kun-Yi
;
Huang, Chung-Chun
;
Chang, Yu-Choung
A method observing both radial and axial vibrations of time domain and frequency spectrum was studied to investigate the axial load effect of a flat-type brushless dc fan motor operating with and without the rated axial thrust force. When the developed small motor does not exhibit an intrinsically excited unbalanced magnetic force (UMF), the axial force leads to a minor contribution to the growth of the axial vibration. However, when the UMF is intrinsically excited, the preload can enormously decrease the undesired axial vibration. The ratio of the axial vibration of the prototype with the asymmetric magnetic sheet to the one without the sheet is experimentally observed around 55 percent. It demonstrates that axial load plays an effective and crucial factor in controlling the axial vibration of the mobile fan motor.
Development of a miniature fan motor
(2012-04-01)
Wang, Chien-Chang
;
Yao, Yeong-Der
;
Liang, Kun-Yi
;
Huang, Chung-Chun
;
Chang, Yu-Choung
A novel compact axial flux fan motor was developed. Such a micromotor could be a potential candidate for using as the cooling solution for the next generation mobile devices, for example, smart phones and pico-projectors. The key parameters of the motor, such as back electromotive force, cogging torque, and axial preload are predicted using finite element method. In addition, new approaches are proposed to measure these items, and the corresponding experimental results are in good agreement with the simulated one. Moreover, the undesired vibration harmonic is successfully suppressed, and the fan motor represents a high static pressure and air flow rate. (C) 2012 American Institute of Physics. [doi:10.1063/1.3675993]