The primary focus of this study was to investigate a series of novel motors and pumps,based on a new type of structure called double-stator.The double-stator structure can be used as pump or motor just based on the ap...The primary focus of this study was to investigate a series of novel motors and pumps,based on a new type of structure called double-stator.The double-stator structure can be used as pump or motor just based on the application requirements.A certain amount of pumps or motors can be formed in one shell,and these sub-pumps or sub-motors can work alone or be combined without influence on each other.So this kind of double-stator pump(motor) is called a multi-pump(multi-motor).Through the analysis of multifarious connection modes of the double-acting double-stator multi-pumps and multi-motors,the mathematical expressions of the output flow rate and the rotational speed are acquired.The results indicate that a quantity of different flow rates can be provided by one fixed-displacement multi-pump under the condition of unalterable driven speed by electromotor.Likewise,when supplied by settled input flow,without complex variable mechanism,the functions of double-speed,multiple-speed,and even differential connection can be obtained by employing the use of a double-stator multi-motor.The novel hydraulic transmission is made of such a double-stator multi-pump and multi-motor,and has broad application prospects.展开更多
We investigated a series of novel motors and pumps with a new structure called double-stator. Double-stator can be used as pump or motor just for the working condition on demand. A certain amount of pumps or motors ar...We investigated a series of novel motors and pumps with a new structure called double-stator. Double-stator can be used as pump or motor just for the working condition on demand. A certain amount of pumps or motors are formed in one shell and these subpumps or submotors can work alone or in company without influence on other pumps or moters. This kind of double-stator pumps (motors) are called multi-pumps (multi-motors). Through the analysis of multifarious connection modes of single-acting double-stator multi-pumps and multi-motors, the mathematical expressions of output flow rate, rotational speed and torque are acquired. The results indicate that different flow rates can be provided by one fixed displacement double-stator multi-pump system under the condition of an unalterable driven speed. Likewise, under the terms of a fixed input flow and without complex variable mechanisms, the functions of double speeds, multiple speeds and even differential connection can be realized by a double-stator multi-motor system with various output rotational speeds and torques.展开更多
A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the ...A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system.展开更多
A theory for multi-pump and multi-motor hydraulic systems is presented in this paper based on the analysis of the advantages and disadvantages of the popular hydraulic transmission and the double-stator motor(pump).By...A theory for multi-pump and multi-motor hydraulic systems is presented in this paper based on the analysis of the advantages and disadvantages of the popular hydraulic transmission and the double-stator motor(pump).By taking the single-acting fixed displacement multi-pump and multi-motor driving system as an example,the output speeds in a variety of connections of this novel hydraulic transmission are analyzed theoretically.This research work lays a theoretical foundation for the study of the multi-pump and multi-motor driving system and for the design of the system principle diagram.展开更多
针对超导电机多层绝热(multi-layer insulation,MLI)材料低热流密度需求与紧凑型整机要求的设计矛盾,提出一种基于改进逐层(layer by layer,LBL)模型与二代非支配排序遗传算法的多层绝热多目标协同优化方法。首先,基于辐射传热、气体导...针对超导电机多层绝热(multi-layer insulation,MLI)材料低热流密度需求与紧凑型整机要求的设计矛盾,提出一种基于改进逐层(layer by layer,LBL)模型与二代非支配排序遗传算法的多层绝热多目标协同优化方法。首先,基于辐射传热、气体导热与固体导热方程,通过引入间隔层光学性质、反射屏开孔率及动态自适应系数等关键参数,提升常规LBL模型的计算精度。其次,结合各项传热占比特点,构建最大为四密度区的变密度MLI模型。然后,采用非支配排序遗传算法,以各密度区层数为优化变量,以改进LBL模型作为算法适应度计算函数,约束各密度区层数以及各密度区层数之和,经种群进化得到Pareto前沿。在此基础上,进一步分析了绝热材料热流密度与密度区数量、各密度区层数、层密度的关系以及变密度敷设对热流分布的调控能力。研究结果表明,优化方案中热流密度覆盖0.42~3.11 W/m^(2)、厚度覆盖5.5~43.0 mm,敷设方式覆盖不同层密度的定密度方案、两密度区变密度、三密度区变密度以及四密度区变密度方案。通过调控密度区数量以及密度区的层数、层密度可以实现多层绝热材料优化,降低后续施工难度。展开更多
针对含有齿隙的四电机同步驱动系统,提出了一种高性能四电机同步驱动伺服系统部分失效(partial loss of effectiveness, PLOE)容错控制技术。首先,使用模糊逻辑系统分别逼近电机侧和负载侧的非线性项,在控制设计过程中进行补偿,减小跟...针对含有齿隙的四电机同步驱动系统,提出了一种高性能四电机同步驱动伺服系统部分失效(partial loss of effectiveness, PLOE)容错控制技术。首先,使用模糊逻辑系统分别逼近电机侧和负载侧的非线性项,在控制设计过程中进行补偿,减小跟踪误差,保证跟踪性能。在所设计的控制方法中,只需要对一个自适应参数进行估计,减小设计难度。其次,采用电流观测器实时监测电机电流并估计失效因子,获取当前系统参数信息。最后,基于交叉耦合同步控制的四电机同步架构,设计同步控制信号,保证四电机间的同步性能。为验证该方法的有效性,通过仿真将所提方法与动态面容错控制进行了对比。结果表明,所提方法可以有效减小伺服系统的跟踪误差。展开更多
基金Project(No.50975246)supported by the National Natural Science Foundation of China
文摘The primary focus of this study was to investigate a series of novel motors and pumps,based on a new type of structure called double-stator.The double-stator structure can be used as pump or motor just based on the application requirements.A certain amount of pumps or motors can be formed in one shell,and these sub-pumps or sub-motors can work alone or be combined without influence on each other.So this kind of double-stator pump(motor) is called a multi-pump(multi-motor).Through the analysis of multifarious connection modes of the double-acting double-stator multi-pumps and multi-motors,the mathematical expressions of the output flow rate and the rotational speed are acquired.The results indicate that a quantity of different flow rates can be provided by one fixed-displacement multi-pump under the condition of unalterable driven speed by electromotor.Likewise,when supplied by settled input flow,without complex variable mechanism,the functions of double-speed,multiple-speed,and even differential connection can be obtained by employing the use of a double-stator multi-motor.The novel hydraulic transmission is made of such a double-stator multi-pump and multi-motor,and has broad application prospects.
基金Funded by the National Natural Science Foundation of China (No. 50975246)
文摘We investigated a series of novel motors and pumps with a new structure called double-stator. Double-stator can be used as pump or motor just for the working condition on demand. A certain amount of pumps or motors are formed in one shell and these subpumps or submotors can work alone or in company without influence on other pumps or moters. This kind of double-stator pumps (motors) are called multi-pumps (multi-motors). Through the analysis of multifarious connection modes of single-acting double-stator multi-pumps and multi-motors, the mathematical expressions of output flow rate, rotational speed and torque are acquired. The results indicate that different flow rates can be provided by one fixed displacement double-stator multi-pump system under the condition of an unalterable driven speed. Likewise, under the terms of a fixed input flow and without complex variable mechanisms, the functions of double speeds, multiple speeds and even differential connection can be realized by a double-stator multi-motor system with various output rotational speeds and torques.
基金National Natural Science Foundation of China (No.60774023)
文摘A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system.
基金supported by the National Natural Science Foundation of China(Grant No.50975246)
文摘A theory for multi-pump and multi-motor hydraulic systems is presented in this paper based on the analysis of the advantages and disadvantages of the popular hydraulic transmission and the double-stator motor(pump).By taking the single-acting fixed displacement multi-pump and multi-motor driving system as an example,the output speeds in a variety of connections of this novel hydraulic transmission are analyzed theoretically.This research work lays a theoretical foundation for the study of the multi-pump and multi-motor driving system and for the design of the system principle diagram.
文摘针对含有齿隙的四电机同步驱动系统,提出了一种高性能四电机同步驱动伺服系统部分失效(partial loss of effectiveness, PLOE)容错控制技术。首先,使用模糊逻辑系统分别逼近电机侧和负载侧的非线性项,在控制设计过程中进行补偿,减小跟踪误差,保证跟踪性能。在所设计的控制方法中,只需要对一个自适应参数进行估计,减小设计难度。其次,采用电流观测器实时监测电机电流并估计失效因子,获取当前系统参数信息。最后,基于交叉耦合同步控制的四电机同步架构,设计同步控制信号,保证四电机间的同步性能。为验证该方法的有效性,通过仿真将所提方法与动态面容错控制进行了对比。结果表明,所提方法可以有效减小伺服系统的跟踪误差。
