Study of Contactless Power Supply for Ultrasonic Vibrator on Spindle Apparatus

• Main Authors: Han-Zong Zhang, 張翰宗
• Other Authors: Tsair-Rong Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/66ntk2

碩士 === 國立彰化師範大學 === 電機工程學系 === 105 === In this study, a contactless power supply for the ultrasonic motor on the spindle is proposed. The proposed power supply is composed of a series-parallel resonant circuit and a cylindrical contactless transformer. The series-connected capacitor in the primary side and the parallel-connected capacitor in the secondary side are adopted to stabilize the output high frequency ac power for the ultrasonic motor. The disadvantages of the contact wearing and the rotation speed limitation due to the contact slip ring in the conventional contact type power supply for ultrasonic motor on the spindle would be overcame by the proposed contactless power supply with the cylindrical transformer. In this dissertation, firstly the operation principles of the proposed power supply and the equivalent circuit of the cylindrical transformer are analyzed. Then, the parameters of the series-parallel resonant circuit components would be well designed for providing high efficiency and stable output ac power. Finally, a hardware with rated power 400 W is constructed for corresponding experiments. From the steady and rotation experiments, it can be seen that the proposed power supply can both provide a stable ac power with 25 kHz / 70 V to the ultrasonic motor. Under the output power is 250 W, the efficiency of the proposed supply is 92 % and 89.8 % in respectively steady and rotation tests. When the output power is more than 150 W, the efficiency of the proposed supply is higher than 80 % within the rated output power range.