In order to improve the characteristics of a conventional moving coil permanent magnet linear motor （MCPMLM）, such as weak points on export force, response time, response speed, we studied a permanent magnet （PM） ...In order to improve the characteristics of a conventional moving coil permanent magnet linear motor （MCPMLM）, such as weak points on export force, response time, response speed, we studied a permanent magnet （PM） structure that is a key component of MCPMLM. Different magnetization techniques of single PM and differ- ent array structures of multiple PMs are compared, and a new MCPMLM magnetized along the external field force lines wing eight pieces of a tegular Halbach magnet array with air gaps is proposed as well. The analysis on magnetic field and experimental results of MCPMLM demonstrates that the force between the coil and the PM increases by more than 40%. The simulation frequeney is close to 350 Hz at -3 dB , and the response time is O. 005 s. In addition, the experiment frequency reaches 300 Hz at -3 dB and the response time is 0. 004 s, which agrees well with the simulation results. It means that the developed MCPMLM enjoys advantages in high frequency and rapid response, and can satisfy the requirements of a high speed electro-hydraulic proportional valve.展开更多
The use of design method considering a coil temperature to maximize the thrust density of a double side coreless permanent magnet linear synchronous motor(PMLSM) was presented.The optimal current density where the coi...The use of design method considering a coil temperature to maximize the thrust density of a double side coreless permanent magnet linear synchronous motor(PMLSM) was presented.The optimal current density where the coil temperature reaches an allowable temperature with heat analysis was applied to a magnetic circuit design.Changing optimal current density is verified whenever the design parameters of the motor are altered.The design parameters of the motor were applied to thrust calculation.In this way,the optimal model,which is a reversal of the existing design method,is deduced.The results were compared with the experimental data to verify their validity.When the convection heat transfer coefficient is applied to other models,the results of the analysis and test values show good concordance.The method proposed has some limitations.展开更多
为抑制半开绕组直线电机系统零序电流的产生,提出了一种基于逆变器非线性补偿的半开绕组直线电机系统的直接推力控制(direct thrust force control,DTFC)。首先,对半开绕组直线电机零序电流的运行机理进行了分析;其次,设计了基于新型开...为抑制半开绕组直线电机系统零序电流的产生,提出了一种基于逆变器非线性补偿的半开绕组直线电机系统的直接推力控制(direct thrust force control,DTFC)。首先,对半开绕组直线电机零序电流的运行机理进行了分析;其次,设计了基于新型开关表的DTFC策略;然后,引入了逆变器非线性补偿;最后,对所提DTFC进行了仿真验证。仿真结果表明,所提DTFC能明显抑制零序电流的产生,提高半开绕组直线电机系统的运行效率。其零序电流抑制性能系数约为0.07,不仅具备良好的稳态性能,同时还拥有优越的自启动性能与瞬态性能。展开更多
基金supported by The National High Technology Research and Development of China (863 Programme) under Grant No. 2006AA09Z226
文摘In order to improve the characteristics of a conventional moving coil permanent magnet linear motor （MCPMLM）, such as weak points on export force, response time, response speed, we studied a permanent magnet （PM） structure that is a key component of MCPMLM. Different magnetization techniques of single PM and differ- ent array structures of multiple PMs are compared, and a new MCPMLM magnetized along the external field force lines wing eight pieces of a tegular Halbach magnet array with air gaps is proposed as well. The analysis on magnetic field and experimental results of MCPMLM demonstrates that the force between the coil and the PM increases by more than 40%. The simulation frequeney is close to 350 Hz at -3 dB , and the response time is O. 005 s. In addition, the experiment frequency reaches 300 Hz at -3 dB and the response time is 0. 004 s, which agrees well with the simulation results. It means that the developed MCPMLM enjoys advantages in high frequency and rapid response, and can satisfy the requirements of a high speed electro-hydraulic proportional valve.
基金Work supported by the Second Stage of Brain Korea 21 ProjectsChangwon National University in 2009-2010
文摘The use of design method considering a coil temperature to maximize the thrust density of a double side coreless permanent magnet linear synchronous motor(PMLSM) was presented.The optimal current density where the coil temperature reaches an allowable temperature with heat analysis was applied to a magnetic circuit design.Changing optimal current density is verified whenever the design parameters of the motor are altered.The design parameters of the motor were applied to thrust calculation.In this way,the optimal model,which is a reversal of the existing design method,is deduced.The results were compared with the experimental data to verify their validity.When the convection heat transfer coefficient is applied to other models,the results of the analysis and test values show good concordance.The method proposed has some limitations.
文摘为抑制半开绕组直线电机系统零序电流的产生,提出了一种基于逆变器非线性补偿的半开绕组直线电机系统的直接推力控制(direct thrust force control,DTFC)。首先,对半开绕组直线电机零序电流的运行机理进行了分析;其次,设计了基于新型开关表的DTFC策略;然后,引入了逆变器非线性补偿;最后,对所提DTFC进行了仿真验证。仿真结果表明,所提DTFC能明显抑制零序电流的产生,提高半开绕组直线电机系统的运行效率。其零序电流抑制性能系数约为0.07,不仅具备良好的稳态性能,同时还拥有优越的自启动性能与瞬态性能。
