Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2853
標題: 感應電能傳輸超音波振動輔助主軸之諧振追蹤研究
A Study of Inductive Power Transfer Ultrasonic Vibration Assisted Spindle With Resonance Frequency Tracking
作者: 呂仲哲
Lu, Chung-Che
關鍵字: 諧振追蹤系統;Resonance frequency tracking system;共振頻率飄移;超音波振動輔助主軸;感應電能傳輸;the resonant frequency drift;ultrasonic vibration assisted spindle;inductive power transfer
出版社: 機械工程學系所
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摘要: 
本研究開發一諧振追蹤系統模組,解決加工中共振頻率飄移現象。共振頻率漂移原因為在感應電能傳輸超音波振動輔助主軸切削中,刀具磨耗、切削厚度改變和感應電能傳輸系統過熱…等,皆會造成共振頻率飄移現象,使得刀具振幅不在最佳切削狀態,萬一振幅不穩定出現,會影響加工品質和刀具壽命…等缺點。
接著在超音波振動輔助主軸設計中,利用有限元素分析作模態分析,設計出最佳的超音波振動刀把。在感應電能傳輸設計中,利用有限元素分析作磁場分析,設計出最佳的感應耦合結構。感應電能傳輸所產生的漏電感現象,本文並用補償電路使得傳輸效率提升。在軟硬體設計上,從初級側諧振電路後端迴授電壓訊號以及迴授電流訊號,進入相位比較器,產生一相位差訊號。透過電流訊號為最大值和相位差為零時,其兩訊號會送入Labview作判斷機制分別達到前置頻率掃描模組與動態頻率追蹤模組。而動態頻率追蹤把前置頻率掃描收尋的共振頻率(ω_0)當作基準,當相位差為0~180°時,會開啟遞增頻率掃描。當相位差為180~360°時,會開啟遞減頻率掃描直到加工停止為止。而Labview所產生的頻率會經由外部的功率放大器作電壓放大,再進入初級側電路達到閉迴路控制。
最後在有線電能傳輸實驗結果顯示,供應電壓為166 V_rms(輸入功率達10 W),其刀具前端可產生最大振幅約16 um、共振頻率為26030 Hz,與設計目標28000 Hz,其誤差為7.1 %;而在感應電能傳輸系統,氣隙設計為0.2 mm,利用加工過的罐型鐵芯及線料選用線徑0.5 mm和50匝,感應電能傳輸效率僅達27.9 %(次級側接受功率達7.51 W)且刀把振幅約15 um、共振頻率26040 Hz。而加入補償電路與諧振電路感應電能傳輸效率可達35 %(次級側接受功率達8 W)且刀把振幅約16 um、共振頻率26030 Hz;由實驗得知,在兩線圈相同時,分別為20匝、30匝、40匝、50匝和60匝,隨著不同氣隙下作電能傳輸,匝數越多時不會隨著氣隙不同而較不易造成共振頻率漂移,對於共振頻率追蹤技術,可減少共振頻率漂移現象。
本論文受限於鐵芯圓槽尺寸,最多僅能放置50匝,但用在0.1 mm~0.2 mm氣隙是足夠的。如果氣隙必須加大時,則增加線圈匝數即有相同的刀把振幅。另外線圈匝數從20匝到60匝,隨著氣隙越大時,匝數越大可防止共振頻率變化的能力越強。提昇電能傳輸效率方法,透過實驗驗證,有補償電路、線圈匝數越多以及線徑越小三種方法皆能提昇其傳輸效率。刀把振幅與供應電壓趨於線性關係,未來的控制器內可增加振幅控制模組,因而達到振幅選擇機制,在未來為改善目標。本文的補償電路針對單一工作頻率,未來必須搭配控制器所產生的頻率,因而調節相對應的初級側阻抗值,使得控制系統更加完善且更準確。

In this paper, we developed a resonant tracking frequency system to solve the resonance frequency drift phenomenon . Due to the inductive power transmission of ultrasonic vibration aided spindle, tool abrasion , cutting feed and inductive power transfer system overheat, all of these will make the resonance frequency drift shift, it might affect the tool amplitude doesn''t stay at the optimal cutting state will affect the machining quality and tool life and so on.
In ultrasonic vibration aided spindle design use the finite element analysis for simulate to get tool holder of ultrasonic vibration aided spindle and the best inductive structure. This paper we proposed the compensation circuit which can compensate the inductive power leakage generated by transmission phenomenon. In the system design, the feedback voltage was get from resonant circuit, at the last feedback voltage and feedback current has been entered to phase comparator for phase comparison.
By the voltage and current feedback phase comparator compare, when phase difference was zero with the current signal is the maximum value, the signal will sent into Labview for judging to pre-procedure frequency scanning module and dynamic frequency tracking module. Dynamic frequency tracking make the pre-procedure frequency scanning resonance frequency as reference. When the phase difference from 0� to 180� will activate the increasing the frequency scanning program.When the phase difference from 180� to 360�, will activate the decreasing the frequency scanning program until the processed stopped.Power amplifier and Labview generated by the frequency through the external voltage amplification, then enter the primary side circuit to achieve closed loop control.
In wire power transmission experimental results has shown when the voltage provided at 166 V_rms (input power up to 10 W), which can produce the maximum amplitude of the tool front about 16 um with resonance frequencies 26030 Hz. Compared with the ideal designed of resonance frequencies 28000 Hz the error was 7.1%. In inductive power transfer experiment, the air gap was 0.2 mm, the processed pot-type core and wire diameter 0.5 mm with 50 turns are selected for inductive power transfer system. The result had shown that Inductive power transfer efficiency is only reached 27.9% (secondary side has received power about 7.51 W) and the tool amplitude reached about 15 um with the resonance frequency 26040 Hz. When added the compensation circuit and the resonant circuit the inductive power transfer efficiency improvement to 35% (secondary side received power up to 8 W) and reached about 16 um of the tool amplitude with the resonance frequency 26030 Hz; From the experimental results has shown, when the both coils are without difference, more turns will reduce the resonance frequency drift generated by the air gap ,this effect can reduce the resonance frequency drift.
Our research was limited by the core circular groove dimensions, just only can place up to 50 turns, If the air gap have to increase in future as the bigger gap can be place more coil turn. With the bigger gap, will improve preventing the ability of resonant frequency change.Through from the experimental verification, to enhance the efficiency of power transmission methods was compensation circuit, more number of turns and the smaller diameter, all of these are the way to enhance transmission efficiency. Farther from the experiment verification and found tool and provided voltage amplitude has a linear relation, in the future we can design a controller for control the amplitude by control module, so as to achieve the optional of amplitudes tool. In this thesis the compensation circuit only for compensate a single frequency, in future will be Collocation with a frequency which generated by controller, thereby regulating the primary side of the corresponding impedance values, let the control system was more completed and more accurate.
URI: http://hdl.handle.net/11455/2853
其他識別: U0005-1707201317374900
Appears in Collections:機械工程學系所

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