摘要：
A bandwidth adaptable third-order all-digital phase-locked loop (PLL) based on PI control algorithm is proposed in this paper. On the analysis of the mathematical model of analog PLL system, mathematical model for bandwidth adaptable all-digital PLL is firstly established and theoretical analysis is therefore carried out, and then the relationship between the proportional/integral parameters of the PLL and the input signal frequency is derived. And finally under the Matlab/Simulink (R) environment, system-level model for the PLL is directly constructed using DSP Builder (R), and system design is completed by using VHDL and is implemented on a FPGA based platform. Both system simulation and experimental results confirm the correctness of the design. The control parameters of this PLL change adaptively with the variation of input signal frequency, and it features with its high frequency-locking speed, wide frequency-tracking range, easy integration and broad versatility.
期刊：
IWJT-2010: Extended Abstracts - 2010 International Workshop on Junction Technology,2010年:210-213
通讯作者：
He, H.(hehongyu1999@yahoo.com.cn)
作者机构：
[Xueren Zheng; Hongyu He] Institute of Microelectronics, School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China;[Hongyu He] Faculty of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
会议名称：
2010 International Workshop on Junction Technology(2010国际结技术学术研讨会 IWJT 2010)
会议时间：
2010-05-10
会议地点：
上海
会议论文集名称：
2010 International Workshop on Junction Technology(2010国际结技术学术研讨会 IWJT 2010)论文集
摘要：
The interior permanent magnet synchronous motor (IPMSM) can make use of the magnetoresistive effect to improve its efficiency and speed characteristics, so that it is suited to railway vehicle. To solve electromagnetic torque output insufficient of IPMSM using the traditional field weakening control method, the field weakening control strategy of interior permanent magnet synchronous motor for railway vehicle was studied in the paper. A novel method of modifying the current reference and field weakening based on the maximum electromagnetic torque at full speed (whether in the base rate areas or in the field weakening region) were proposed. The method consists of two parts, one is the determination of the field weakening region, and another is the current reference modification. The field weakening region was determined. The reference current vector and the maximum electromagnetic torque expression were obtained by solving the voltage limit equations and the current limit equations in the field weakening region I; the reference current vector was obtained by solving the voltage limit equations and the electromagnetic torque equations in the field weakening region II. The current reference was modified by the field weakening direction and the magnitude of the voltage error according to the field weakening region. The simulink model was founded by Matlab and the experiment platform of the 100 kW IPMSM field weakening control system was implemented using a TMS320LF2407A DSP. The validity of the proposed strategy was proved by the simulation and experimental results.
作者机构：
[盛义发; 桂卫华; 喻寿益] Institute of Information Science and Engineering, Central South University, Changsha 410083, Hunan Province, China;[洪镇南] School of Electrical Engineering, University of South China, Hengyang 421001, Hunan Province, China
通讯机构：
Institute of Information Science and Engineering, Central South University, China
作者机构：
[Sheng Yifa; Zhou Wen-zhen] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.;[Sheng Yifa; Yu Shou-yi] Cent China Normal Univ, Inst Informat Sci & Engn, Changsha 410083, Peoples R China.
会议名称：
The 22nd China Control and Decision Conference(2010年中国控制与决策会议)
会议时间：
2010-05-26
会议地点：
徐州
会议主办单位：
[Sheng Yifa;Zhou Wen-zhen] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.^[Sheng Yifa;Yu Shou-yi] Cent China Normal Univ, Inst Informat Sci & Engn, Changsha 410083, Peoples R China.
会议论文集名称：
The 22nd China Control and Decision Conference(2010年中国控制与决策会议)论文集
关键词：
railway vehicles;interior permanent magnet synchronous motor;efficiency optimization;intelligent integrated control
摘要：
To improve the steady state efficiency of interior permanent magnet synchronous motor system(IPMSM), the intelligent integrated online optimal control strategy of IPMSM efficiency optimization was presented. The intelligent integrated control technology and torque compensation method were combined to the system. The method of adaptive fuzzy logic to adjust direct-axis current was adopted in the first half search, using the adaptive step size to reduce the torque fluctuations. The golden section search method was adopted in the next half search to speed up the search process and improve its convergence. While in the whole process, the torque correction program was introduced to compensate the torque current in real-time and resolve the torque pulsation problem in the regulation process of the excitation current. The dynamic and static performances of the system are improved. A 100kW IPMSM efficiency optimization intelligent integrated control system was implemented using a TMS320LF2407A DSP. Experimental results prove the validity of the proposed strategy.
摘要：
The roundness and surface roughness are important quality performances for machined round parts. In order to get the best quality performance by less experiment search for optimum parameters, an orthogonal array was used for the experimental design, optimal machining parameters were determined by the grey relational grade obtained from the grey relational analysis, and the main machining parameters that affect the machining performance can be found by the difference between the maximum and minimum value of the grey relational grade of the machining parameters. Experimental results have shown that the roundness and surface roughness of machined round parts can be improved effectively by the proposed approach.
