發(fā)布時間：2018-06-14 17:48

  本文選題：軸流式血泵 + 大間隙��； 參考：《中南大學(xué)》2013年博士論文

【摘要】：血泵作為人工心臟的核心部件,最主要的功能是代替自然心臟完成泵血功能,因此血泵驅(qū)動系統(tǒng)與控制方法的研究,是人工心臟走向臨床應(yīng)用所要面臨的首要問題。 在血泵的大間隙磁力驅(qū)動技術(shù)應(yīng)用研究方面,血泵的轉(zhuǎn)速與機體的生理狀態(tài)有著直接的對應(yīng)關(guān)系,是系統(tǒng)首要的控制目標(biāo)參數(shù)。而目前對血泵的速度控制策略缺乏較為深入的研究,血泵啟動過程的穩(wěn)定性、調(diào)速響應(yīng)的快速性以及運行過程的平穩(wěn)性等均有待提高。此外,系統(tǒng)還存在能量利用率低、發(fā)熱嚴(yán)重及驅(qū)動裝置笨重等問題,且對系統(tǒng)的控制參數(shù)(通電電流、脈沖頻率、驅(qū)動程序)、性能參數(shù)(驅(qū)動力矩、負(fù)載功率)以及輸出狀態(tài)參數(shù)(血泵轉(zhuǎn)速、流量、壓力)等之間的相互作用規(guī)律缺乏較為系統(tǒng)的研究。 本文以實現(xiàn)血泵快速、平穩(wěn)的調(diào)速響應(yīng)和可靠、安全的運行狀態(tài)監(jiān)控為目標(biāo),通過對系統(tǒng)電磁驅(qū)動性能、能量損耗以及矩頻-矩角特性等基礎(chǔ)科學(xué)問題的研究,提出血泵調(diào)速及穩(wěn)定運行過程的速度控制方法,并實現(xiàn)了血泵輸出狀態(tài)的閉環(huán)控制,為血泵自適應(yīng)控制系統(tǒng)的建立提供參考。 論文的主要研究內(nèi)容及結(jié)論： 1、設(shè)計血泵電磁驅(qū)動閉環(huán)控制系統(tǒng) 根據(jù)人體生理模式基本調(diào)節(jié)機制,針對不同生理狀況(不同血壓)下所對應(yīng)的不同心臟搏血量,設(shè)計軸流式血泵的磁力驅(qū)動閉環(huán)控制系統(tǒng),以血泵輸出流量為反饋控制參數(shù),實現(xiàn)了滿足不同血壓(不同的血泵出口壓力)下血泵出口流量的自動調(diào)節(jié)。 2、建立電磁驅(qū)動系統(tǒng)能量損耗計算模型 針對系統(tǒng)中的渦流損耗、磁滯損耗和銅損等幾種主要能量損耗形式,建立血泵電磁驅(qū)動系統(tǒng)能量損耗數(shù)學(xué)模型；仿真研究不同鐵芯形狀對電磁體鐵損耗的影響規(guī)律,結(jié)果表面鐵芯形狀對磁滯損耗影響不大,而當(dāng)鐵芯形狀不對稱時,對渦流損耗影響約為5%。 3、基于矩角特性提出最大驅(qū)動力矩磁極狀態(tài)控制方法 根據(jù)驅(qū)動電路電壓-電流方程,建立電磁驅(qū)動系統(tǒng)的矩頻-矩角特性數(shù)學(xué)模型,研究通電電流隨脈沖頻率的變化規(guī)律,通過數(shù)值計算和實驗,得出能使血泵獲得最大磁驅(qū)動力矩的電磁體磁極狀態(tài)切換偏移角計算公式,提出磁極狀態(tài)控制方法。 4、基于矩頻特性提出最小能耗血泵啟動電流控制方法 基于矩頻特性和能量損耗模型,提出最小能耗血泵啟動過程電流控制方法,實驗驗證了小電流遞增啟動方法的可行性；從啟動響應(yīng)的快速性出發(fā),提出了基于血泵啟動過程動力學(xué)模型的速度控制方法,通過實驗,血泵能在2s內(nèi)達到額定輸出功率,驗證了控制方法的有效性。 5、提出血泵恒功率輸出控制方法 針對血泵穩(wěn)速運行過程,提出不同耦合距離下血泵恒功率輸出控制方法,能根據(jù)磁極耦合距離的變化,實現(xiàn)穩(wěn)定的血泵輸出功率；基于磁極狀態(tài)偏移角計算公式,提出血泵最大磁力矩控制方法,采用修正后的控制程序,使血泵的最大負(fù)載力矩提高了9.5%。
[Abstract]:As the core part of artificial heart , the main function of blood pump is to replace the natural heart to complete the pump blood function , so the research of the blood pump driving system and control method is the primary problem to be faced by the artificial heart to the clinical application .

In the application of the large - gap magnetic drive technology of blood pump , the rotational speed of blood pump is directly related to the physiological state of the body , which is the primary control target parameter of the system .

In order to realize the fast and stable speed regulation response and reliable and safe operation state monitoring of blood pump , this paper puts forward the speed control method of blood pump speed regulation and stable operation process by studying the basic science problems such as electromagnetic drive performance , energy loss and moment frequency - moment angle characteristic of the system , and realizes the closed - loop control of the output state of the blood pump , and provides reference for the establishment of the blood pump self - adaptive control system .

The main contents and conclusions of the thesis are as follows :

1 . Design blood pump electromagnetic drive closed - loop control system

according to the basic regulation mechanism of the physiological mode of the human body , the closed - loop control system of the magnetic force of the axial - flow blood pump is designed aiming at different heart beat blood volumes corresponding to different physiological conditions ( different blood pressure ) , the output flow of the blood pump is used as a feedback control parameter , and the automatic regulation of the outlet flow of the blood pump under different blood pressure ( different blood pump outlet pressure ) is realized .

2 . Establish an electromagnetic drive system energy loss calculation model

Aiming at the eddy current loss , hysteresis loss and copper loss in the system , the mathematical model of energy loss of the electromagnetic drive system of blood pump is established .
The influence of different core shape on iron loss of electromagnet is studied . The influence of surface iron core shape on hysteresis loss is not large , and when the shape of iron core is asymmetric , the influence of core shape on eddy current loss is about 5 % .

3 . Method for controlling state of pole state of maximum driving torque based on moment angle characteristic

According to the voltage - current equation of the drive circuit , a mathematical model of the moment frequency - moment angle characteristic of the electromagnetic drive system is established , and the change law of the electrified current with the pulse frequency is studied . Through the numerical calculation and experiment , the calculation formula of the magnetic pole state switching offset angle can be obtained which can make the blood pump obtain the maximum magnetic driving torque , and the magnetic pole state control method is proposed .

4 . Method for controlling starting current of blood pump with minimum energy consumption based on moment frequency characteristic

Based on the moment frequency characteristic and the energy loss model , the current control method of the minimum energy consumption blood pump starting process is put forward , and the feasibility of the small current incremental starting method is verified .
Based on the rapidity of starting response , the velocity control method based on the dynamic model of blood pump is put forward . Through experiments , the blood pump can reach the rated output power within 2s , and the effectiveness of the control method is verified .

5 . Method for controlling constant power output of blood pump

aiming at the steady - speed operation process of the blood pump , a constant power output control method of the blood pump at different coupling distances is proposed , and stable blood pump output power can be realized according to the change of the coupling distance of the magnetic pole ;
Based on the calculation formula of magnetic pole state deviation angle , the maximum torque control method of blood pump is put forward , and the maximum load torque of the blood pump is increased by 9.5 % by the modified control program .
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：R318.11;TP273

【參考文獻】

相關(guān)期刊論文 前9條

1 興濤;楊建波;郭永獻;;U型磁鐵磁路分布與氣隙磁感應(yīng)強度[J];機械設(shè)計與制造;2008年07期

2 龔中良;譚建平;;外場驅(qū)動血泵磁力耦合傳動受力分析[J];機械科學(xué)與技術(shù);2006年06期

3 曹家勇,周祖德,陳幼平,艾武,詹瓊?cè)A;開關(guān)磁阻型動力磁軸承瞬時轉(zhuǎn)矩控制策略的研究[J];機械工程學(xué)報;2004年05期

4 趙國濤;譚慶昌;李為;;直線往復(fù)運動磁力傳動[J];機械工程學(xué)報;2007年01期

5 曹紅蓓;江武;;磁傳動裝置密封罩的設(shè)計及溫度場分析[J];機械設(shè)計;2012年12期

6 李文生;;氣隙大小對混合式步進電機轉(zhuǎn)矩的影響[J];通信電源技術(shù);2006年04期

7 李國榮;朱曉東;郝宗超;田步升;陳海豐;;心尖軸流泵的解剖相容性及對心肌損傷的動物實驗觀察[J];醫(yī)療衛(wèi)生裝備;2010年03期

8 周贛;黃學(xué)良;柏瑞;傅萌;張前;;磁懸浮平面電機的解耦控制策略[J];中國電機工程學(xué)報;2009年12期

9 徐先懂;龔中良;譚建平;;基于外磁場耦合的血泵驅(qū)動系統(tǒng)[J];中南大學(xué)學(xué)報(自然科學(xué)版);2007年04期

，

本文編號：2018444