变速异步电动机比例恒压泵电液动力源特性研究

发布时间：2018-04-29 16:47

本文选题：电液动力源 + 复合控制　；参考：《机械工程学报》2017年18期

【摘要】：电液动力源是为液压系统提供动力的单元,其能量效率决定整个系统的能效。针对现有变排量电液比例压力流量复合控制动力源,非工作周期电动机仍以额定转速运转,产生较大能耗;变转速异步电动机驱动定量泵动力源,难以直接控制压力的问题,提出采用变转速交流异步电动机驱动比例恒压泵构造新的电液压力流量复合控制动力源,通过改变斜盘摆角实现无节流损失压力连续控制,改变泵转速实现泵输出流量连续控制。进一步针对异步电动机变转速驱动动态响应慢的问题,提出在主回路增设液压蓄能器,并将其高压油液分别引入液压泵吸油口和出油口,辅助驱动液压泵加速起动和制动的解决方案。研究中,构建了基于上述原理的电液动力源试验测试系统,对其压力控制特性、流量控制特性、压力流量复合控制特性及功率控制特性进行研究,结果表明,随负载压力变化流量控制精度误差不超0.5%,采用蓄能器辅助驱动、辅助制动可使变频电动机起、停时间分别由1 s和1.2 s减小到0.2 s和0.5 s;在保压工况、非工作周期压力卸荷工况、恒压工况,通过降低电动机转速,较恒定电动机转速驱动,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.
【作者单位】：太原理工大学新型传感器与智能控制教育部与山西省重点实验室;
【基金】：国家自然科学基金(51575374) NSFC-山西省煤基低碳联合基金(U1510206)资助项目
【分类号】：TH137;TM343

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