采用双定子泵的多级恒功率调速系统回路特性分析与试验  

Analysis and test on circuit characteristic of multi-stage constant power governing system using double-stator pump

作　　者：闻德生[1] 柴伟超 王京[1] 陈帆[1] 甄新帅 马光磊[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004

出　　处：《农业工程学报》2016年第22期107-112,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50975246)

摘　　要：传统恒功率调速系统的调节原理(转速与转矩的乘积必为定值)决定其无法满足转矩不变、输出不同转速的工况要求。为解决上述问题,采用双定子泵对其进行改进,对组成的多级恒功率调速系统性能与传统系统进行了对比分析,并搭建试验台进行了试验论证。结果表明,采用双定子泵组成的多级恒功率调速系统既具有传统系统适应恒功率工况的特性,传动效率可比普通定量泵系统提高7%,又能满足多级恒功率负载的工况。在工况要求转矩输出恒定的前提下,若要求马达输出多级转速,多级恒功率调速系统可以通过控制双定子泵的工作方式以较少的功率满足要求,而传统恒功率调速系统则只能采用节流调速的方式溢流掉一部分流量来满足要求,因此前者比后者减少了能量的损失。该研究既丰富了双定子泵的应用领域,也可为恒功率调速系统应用于农业机械并提高其工作效率提供参考。Traditional pump-motor constant power governing system can achieve power matching between the load and the prime mover to reduce energy waste under the conditions with the constant power load. In practical application, some conditions demand hydraulic system outputting constant torque but different speeds. For example, agricultural machinery walking in the same road conditions requires different speeds to choose. However, limited by the governing principle （the product of rotational speed and torque will be a fixed value）, traditional pump-motor constant power governing system can’t meet the above conditions. So it can only use throttle governor, which will inevitably lead to energy waste and efficiency decrease. Therefore, it’s necessary to research a new hydraulic system which can meet multi-stage constant power conditions in principle. New double-stator pump （motor） offers the possibility of studying multi-stage constant power governing system. Because internal and external multiple pumps exist in one housing implements and share one rotor, double-stator pump can output a variety of different flows by controlling the working modes of the respective pumps. It is used to replace the old pump in the traditional pump-motor constant power governing system which then becomes a new multi-stage constant power governing system. A comparative analysis of the circuit characteristics was carried out between the multi-stage constant power governing system and the traditional system. Then a test platform was set up to carry out the experiment.The results indicated that the three-stage constant power governing system composed of single-acting double-stator pump could meet constant power condition, which was just as the traditional system. Under the same condition of constant power load, the common quantitative pump hydraulic system’s transmission efficiency was only 82%-86%, but both the traditional pump-motor constant power governing system and the three-stage constant power governing system could reach 94%, a

关 键 词：农业机械 泵 试验 双定子泵 恒功率 多级输出 

分 类 号：TH137[机械工程—机械制造及自动化]