Electro-hydraulic power source is the power unit of hydraulic system, and its energy efficiency decided the whole hydraulic system efficiency. Currently, the variable displacement electric-hydraulic proportional integrated pressure control flow control power source, whose motor still run at rated speed during the non-working period produce lots of extra energy consumption, and the constant displacement pump power source driven by variable speed asynchronous motor hard to control the output pressure directly. Addressing those shortcomings, it is introduced that a method to construct new type electric-hydraulic proportional integrated pressure control flow control power source through using variable speed asynchronous motor driven proportional constant pressure pump. In this new type power source, no throttling loss pressure continuous control can be realized by changing the swinging angle of inclined plate and the output flow continuous control can be reached by changing the revolution speed of pump. Furthermore, for the problem of slow dynamic response in asynchronous electric variant speed driving, a solution is introduced that aided accelerating the launch and braking of the pump through adding hydraulic accumulator in main circle and bringing its high-pressure oil into the hydraulic pump inlet. Based on these theory, the electro-hydraulic power source test system is build, and its control characteristics of power, pressure, flow, compound of flow and pressure are studied. The results show that with the load pressure changes the flow control error of the test system does not exceed 0.5%, aided accelerating the launch and braking through adding hydraulic accumulator can make launch time and braking time of the variable-frequency motor from 1 s and 1.2 s down to 0.2 s and 0.5 s, and through reduced the motor rotation speed, the test system can reduce the energy consumption beyond 20% than use constant speed motor drive in several working situations such as pressure maintaining, pressure unloading, and constant pressure situation.
YAN Zheng
,
QUAN Long
,
ZHANG Xiaogang
. Research on the Characteristic of the Electro-hydraulic Power Source Composed of Variable Speed Asynchronous Motor and Proportional Constant Pressure Pump[J]. Journal of Mechanical Engineering, 2017
, 53(18)
: 183
-190
.
DOI: 10.3901/JME.2017.18.183
[1] 权龙, HELDUSER S. 基于可调速电动机的高动态节能型电液动力源[J]. 中国机械工程, 2003, 14(7):606-609. QUAN Long, HELDUSER S. Energy saving and high dynamic hydraulic power unit based on speed variable motor and constant hydraulic pump[J]. China Mechanical Engineering, 2003, 14(7):606-610.
[2] 闫政, 权龙, 黄家海. 变转速变排量双控轴向柱塞泵脉动特性及噪声研究[J]. 机械工程学报, 2016, 52(16):176-184. YAN Zheng, QUAN Long, HUANG Jiahai. Characteristics of pulsation and noise in the axial piston pump with displacement and speed compound control[J]. Journal of Mechanical Engineering, 2016, 52(16):176-184.
[3] XU B, CHENG M, YANG H, et al. A hybrid displacement//pressure control scheme for an electrohydraulic flow matching system[J]. IEEE/ASME Transactions on Mechatronics, 2015, 20(6):1-12.
[4] XU B, DING R, ZHANG J, et al. Pump/valves coordinate control of the independent metering system for mobile machinery[J]. Automation in Construction, 2015, 57:98-111.
[5] 权龙, 李敏, 秦太龙. 低空转能耗液压动力源:中国, 200610012474.3[P]. 2006-08-23. QUAN Long, LI Min, QIN Tailong. Low altitude power consumption hydraulic power source:China, 200610012474.3[P]. 2006-08-23.
[6] 杨华勇, 胡东明, 徐兵. 变配重的节能技术及其能耗机理分析[J]. 机械工程学报, 2010, 46(2):132-138. YANG Huayong, HU Dongming, XU Bing. Energy- saving technology of variable counterweight and its energy consumption analyses[J]. Journal of Mechanical Engineering, 2010, 46(2):132-138.
[7] YAMAMOTO T. Apparatus for controlling a hydraulic elevator:US, 4593792[P]. 1986-06-10.
[8] TANAKA Y, NAKANO K, YAMAMOTO N. Energy- saving hydraulic power source using inverter-motor drive[C]//Jfps International Symposium on Fluid Power, the Japan Fluid Power System Society, 1989:95-102.
[9] TANAKA Y, NAKANO K, YAMAMTO N. Energy-saving hydraulic power source with inverter-motor drive[J]. Transactions of the Japan Hydraulics & Pneumatics Society, 1990, 21(4):408-416.
[10] TANAKA Y, NAKANO K. Variable speed control of hydraulic pump for energy savings[C]//Proceedings of the first International symposium on Fluid Power transmission and control, Beijing, China, 1991:124-128.
[11] LOVEREC D, KASTREVE M, ULAGA S. Electro- hydraulic load sensing with a speed-controlled hydraulic supply system on forming-machines[J]. International Journal of Advanced Manufacturing Technolgy, 2009, 41:1066-1075.
[12] TAKAKU K, HIRAIDE H, OBA K. Application of the "ASR Series" ac servo motor driven hydraulic pump to injection molding machines[C]//Proceedings of the JFPS International Symposium on Fluid Power. The Japan Fluid Power System Society, 2008, 2008(7-1):127-130.
[13] IMAMURA T, SAWADA Y, ICHIKAWA M, et al. Energy-saving hybrid hydraulic system comprising highly efficient IPM motor and inverter, for injection molding and manufacturing machine[C]//Proceedings of the 7th JFPS International Symposium on Fluid Power, TOYAMA, 2008:117-120.
[14] 张红娟, 权龙, 李斌. 注塑机电液控制系统能量效率对比研究[J]. 机械工程学报, 2012, 48(8):180-187. ZHANG Hongjuan, QUAN Long, LI Bin. Comparative study on energy efficiency of the electro-hydraulic controlsystem in injection molding machine[J]. Journal of Mechanical Engineering, 2012, 48(8):180-187.
[15] 杨世平, 余浩, 刘金刚, 等. 液压挖掘机动力系统功率匹配及其节能控制[J]. 机械工程学报, 2014, 50(5):152-160. YANG Shiping, YU Hao, LIU Jingang, et al. Research on power matching and energy saving control of power system in hydraulic excavator[J]. Journal of Mechanical Engineering, 2014, 50(5):152-160.
