Browsing by Author "Wang, Chien-Chang"

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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.
Bias-magnetic force for vibration reduction of magnetic bearing motors
(2007-06-01)
Wang, Chien-Chang
;
Yao, Y. D.
;
交大名義發表
;
National Chiao Tung University
The objective of this paper is to propose a compact method using a novel bias magnet to induce an axial bias-magnetic force in order to reduce the radial vibration of a magnetic bearing (MB) motor. After applying the bias-magnetic force, the optimal radial vibration of the developed NIB motor is only around 0.197 g (peak-peak, 1 g = 9.8 m/s(2)) when the natural frequency of the bias magnet reaches the resonant frequency of 62 Hz. In this optimal condition, the ratio in the radial vibration of the MB motor with the bias-magnetic force to the original one is around 89%, and the driving power of 0.24 W is saved.
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]
Micro-magnetic suspension motor design for miniature optical drive
(2006-07-01)
Wang, Chien-Chang
;
Yao, Yeong-Der
;
Liu, Chien-Sheng
;
Cheng, Lung-Yu
;
交大名義發表
The main purpose of this study is to develop a low vibration micromotor applied in a miniature optical drive. To minimize the micromotor vibration, passive magnetic suspensidn technology has been used. The magnetic forces between the permanent magnets are estimated using the finite element method; the stable zone of operation of the motor developed was determined. A new micromotor with 62% of the radial vibration of the conventional micro-ball-bearing motor has been successfully developed. In addition, the new motor demonstrates lower friction torque loss.