本文選題：電液動力源 + 復(fù)合控制��； 參考：《機(jī)械工程學(xué)報(bào)》2017年18期

【摘要】：電液動力源是為液壓系統(tǒng)提供動力的單元,其能量效率決定整個系統(tǒng)的能效。針對現(xiàn)有變排量電液比例壓力流量復(fù)合控制動力源,非工作周期電動機(jī)仍以額定轉(zhuǎn)速運(yùn)轉(zhuǎn),產(chǎn)生較大能耗;變轉(zhuǎn)速異步電動機(jī)驅(qū)動定量泵動力源,難以直接控制壓力的問題,提出采用變轉(zhuǎn)速交流異步電動機(jī)驅(qū)動比例恒壓泵構(gòu)造新的電液壓力流量復(fù)合控制動力源,通過改變斜盤擺角實(shí)現(xiàn)無節(jié)流損失壓力連續(xù)控制,改變泵轉(zhuǎn)速實(shí)現(xiàn)泵輸出流量連續(xù)控制。進(jìn)一步針對異步電動機(jī)變轉(zhuǎn)速驅(qū)動動態(tài)響應(yīng)慢的問題,提出在主回路增設(shè)液壓蓄能器,并將其高壓油液分別引入液壓泵吸油口和出油口,輔助驅(qū)動液壓泵加速起動和制動的解決方案。研究中,構(gòu)建了基于上述原理的電液動力源試驗(yàn)測試系統(tǒng),對其壓力控制特性、流量控制特性、壓力流量復(fù)合控制特性及功率控制特性進(jìn)行研究,結(jié)果表明,隨負(fù)載壓力變化流量控制精度誤差不超0.5%,采用蓄能器輔助驅(qū)動、輔助制動可使變頻電動機(jī)起、停時(shí)間分別由1 s和1.2 s減小到0.2 s和0.5 s;在保壓工況、非工作周期壓力卸荷工況、恒壓工況,通過降低電動機(jī)轉(zhuǎn)速,較恒定電動機(jī)轉(zhuǎn)速驅(qū)動,降低能耗20%以上。
[Abstract]:The electro-hydraulic power source is the unit that provides the power for the hydraulic system, and its energy efficiency determines the energy efficiency of the whole system. In view of the existing variable displacement electro-hydraulic proportional pressure flow control power source, the non-working cycle motor still operates at rated speed, resulting in large energy consumption, and the variable speed asynchronous motor drives the quantitative pump power source, which is difficult to directly control the pressure. A new hybrid control power source of electro-hydraulic pressure and flow is constructed by using proportional constant pressure pump driven by AC asynchronous motor with variable rotational speed. The continuous control of pressure without throttling loss is realized by changing the swinging angle of the skew disk. Changing pump speed to realize continuous control of pump output flow. In order to solve the problem of slow dynamic response of variable speed drive of asynchronous motor, a new hydraulic accumulator is put forward in the main circuit, and its high pressure oil is introduced into the suction port and outlet of hydraulic pump, respectively. Auxiliary drive hydraulic pump acceleration starting and braking solution. In the research, the test system of electro-hydraulic power source based on the above principle is constructed. The characteristics of pressure control, flow control, pressure flow compound control and power control are studied. The results show that, With the change of load pressure, the error of flow control precision is not more than 0.5. The auxiliary brake can reduce the stop time of frequency conversion motor from 1 s and 1.2 s to 0.2 s and 0.5 s, respectively. Under the condition of non-working cycle pressure unloading and constant voltage, the energy consumption can be reduced by more than 20% by reducing the motor speed and driving the constant motor speed.
【作者單位】： 太原理工大學(xué)新型傳感器與智能控制教育部與山西省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51575374) NSFC-山西省煤基低碳聯(lián)合基金(U1510206)資助項(xiàng)目
【分類號】：TH137;TM343

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