The detent force of a permanent magnet linear synchronous motor （PMLSM） is analyzed and the corresponding optimization methods are presented to reduce it. The detent force, which is divided into two components, i.e....The detent force of a permanent magnet linear synchronous motor （PMLSM） is analyzed and the corresponding optimization methods are presented to reduce it. The detent force, which is divided into two components, i.e. resulting from the end effect and resulting from the slotting effect, can be analyzed respectively by the finite element method （FEM）. To reduce the detent force arising from the end effect, several optimal design techniques are utilized, namely, adopting the suitable length and end shape of the primary armature. The detent force resulting from the slotting effect is reduced by means of skewing and adjusting the width of the magnets mounted on the secondary armature, and adopting the fractional slots of the primary armature. The validity of the analytical detent force predictions and the effectiveness of the detent force reduction techniques are verified by the experimental measurements.展开更多
现有的高速磁浮交通系统采用直线同步电机牵引技术,然而磁浮交通系统中实际使用的直线同步电机体积庞大且造价昂贵,不利于前期开发和研究。对此,开发了一种分段式永磁直线同步电机(Permanent magnet linear synchronous motor,PMLSM)牵...现有的高速磁浮交通系统采用直线同步电机牵引技术,然而磁浮交通系统中实际使用的直线同步电机体积庞大且造价昂贵,不利于前期开发和研究。对此,开发了一种分段式永磁直线同步电机(Permanent magnet linear synchronous motor,PMLSM)牵引驱动样机,旨在以低成本的方式快速简易地部署和验证磁浮交通直线运动控制算法。针对样机,设计并实现了一种基于ARM-FPGA双核的专用控制器。双核分别承担算法部署和控制实施的功能。此外在控制器中引入了EtherCAT网络技术,以搭建低延迟和高精度的网络化控制架构,仿真和试验证明了其可行性和可用性。未来将利用该驱动系统架构开发、部署和验证更多的磁浮交通直线运动控制算法。展开更多
This paper presents a method for compensating the force ripple in permanent magnet linear synchronous motors(PMLSMs)by adopting a composite feedforward compensation scheme.Firstly,the vector control system of PMLSMs i...This paper presents a method for compensating the force ripple in permanent magnet linear synchronous motors(PMLSMs)by adopting a composite feedforward compensation scheme.Firstly,the vector control system of PMLSMs is described,and various force disturbances influencing the electromagnetic thrust are analyzed.As a result,the mathematical model of the whole system considering the force ripple is established.Then,a novel composite feedforward compensation scheme is proposed,which consists of a recursive least squares(RLS)parameter identification component and two feedforward compensation loops corresponding to the reference position trajectory and the force ripple,respectively.Finally,the effectiveness and advantages of the proposed composite feedforward compensation are demonstrated by simulation.The main incentive of this paper is the combination with the composite feedforward compensation loop corresponding to the reference position trajectory to improve the compensation effect of force ripple in PMLSMs.展开更多
A robustness-tracking control scheme based on combining H_∞ robust control and sliding mode control is proposed for a direct drive AC permanent-magnet linear motor servo system to solve the conflict between tracking ...A robustness-tracking control scheme based on combining H_∞ robust control and sliding mode control is proposed for a direct drive AC permanent-magnet linear motor servo system to solve the conflict between tracking and robustness of the linear servo system. The sliding mode tracking controller is designed to ensure the system has a fast tracking characteristic to the command, and the H_∞ robustness controller suppresses the disturbances well within the close loop(including the load and the end effect force of linear motor etc.) and effectively minimizes the chattering of sliding mode control which influences the steady state performance of the system. Simulation results show that this control scheme enhances the track-command-ability and the robustness of the linear servo system, and in addition, it has a strong robustness to parameter variations and resistance disturbances.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.60474021)
文摘The detent force of a permanent magnet linear synchronous motor （PMLSM） is analyzed and the corresponding optimization methods are presented to reduce it. The detent force, which is divided into two components, i.e. resulting from the end effect and resulting from the slotting effect, can be analyzed respectively by the finite element method （FEM）. To reduce the detent force arising from the end effect, several optimal design techniques are utilized, namely, adopting the suitable length and end shape of the primary armature. The detent force resulting from the slotting effect is reduced by means of skewing and adjusting the width of the magnets mounted on the secondary armature, and adopting the fractional slots of the primary armature. The validity of the analytical detent force predictions and the effectiveness of the detent force reduction techniques are verified by the experimental measurements.
文摘现有的高速磁浮交通系统采用直线同步电机牵引技术,然而磁浮交通系统中实际使用的直线同步电机体积庞大且造价昂贵,不利于前期开发和研究。对此,开发了一种分段式永磁直线同步电机(Permanent magnet linear synchronous motor,PMLSM)牵引驱动样机,旨在以低成本的方式快速简易地部署和验证磁浮交通直线运动控制算法。针对样机,设计并实现了一种基于ARM-FPGA双核的专用控制器。双核分别承担算法部署和控制实施的功能。此外在控制器中引入了EtherCAT网络技术,以搭建低延迟和高精度的网络化控制架构,仿真和试验证明了其可行性和可用性。未来将利用该驱动系统架构开发、部署和验证更多的磁浮交通直线运动控制算法。
基金the National Natural Science Foundation of China(Nos.61374043 and 61603392)the China Postdoctoral Science Foundation Funded Project(Nos.2013M530278 and 2014T70558)
文摘This paper presents a method for compensating the force ripple in permanent magnet linear synchronous motors(PMLSMs)by adopting a composite feedforward compensation scheme.Firstly,the vector control system of PMLSMs is described,and various force disturbances influencing the electromagnetic thrust are analyzed.As a result,the mathematical model of the whole system considering the force ripple is established.Then,a novel composite feedforward compensation scheme is proposed,which consists of a recursive least squares(RLS)parameter identification component and two feedforward compensation loops corresponding to the reference position trajectory and the force ripple,respectively.Finally,the effectiveness and advantages of the proposed composite feedforward compensation are demonstrated by simulation.The main incentive of this paper is the combination with the composite feedforward compensation loop corresponding to the reference position trajectory to improve the compensation effect of force ripple in PMLSMs.
文摘A robustness-tracking control scheme based on combining H_∞ robust control and sliding mode control is proposed for a direct drive AC permanent-magnet linear motor servo system to solve the conflict between tracking and robustness of the linear servo system. The sliding mode tracking controller is designed to ensure the system has a fast tracking characteristic to the command, and the H_∞ robustness controller suppresses the disturbances well within the close loop(including the load and the end effect force of linear motor etc.) and effectively minimizes the chattering of sliding mode control which influences the steady state performance of the system. Simulation results show that this control scheme enhances the track-command-ability and the robustness of the linear servo system, and in addition, it has a strong robustness to parameter variations and resistance disturbances.
