本文選題：永磁直線同步電機　切入點：直接推力控制　出處：《沈陽工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：永磁直線同步電機（PMLSM）以其獨特的優(yōu)勢在工業(yè)自動化、能源的開發(fā)、利用過程中的應用日益廣泛，建立一個系統(tǒng)穩(wěn)定性好，魯棒性強的永磁直線同步電機控制機制已經成為電機控制領域的研究熱點。直接推力控制以其新穎的控制思想，電機模型簡單，控制方法直接等特點，越來越多的受到人們的關注。本文針對永磁直線同步電機直接推力控制進行了研究。 首先，論文簡單地梳理對直線電機的發(fā)展，隨后介紹了永磁直線同步電機，歸納總結了PMLSM的結構和工作原理及控制策略，分析了PMLSM直接推力控制的發(fā)展現(xiàn)狀；建立了PMLSM的數(shù)學模型，詳細地介紹永磁直線同步電機直接推力控制理論，闡明直接推力控制的推力和磁鏈控制原理。 其次，鑒于傳統(tǒng)的直接推力控制系統(tǒng)脈動大，系統(tǒng)穩(wěn)定性差以及響應慢的問題，本文給出一種改進的永磁直線同步電機直接推力控制方法。論文建立新的PMLSM數(shù)學模型，在定子磁鏈坐標系下建立電機模型，在此基礎上對推力和磁鏈進行解耦控制。根據(jù)推力和負載角的線性關系設計推力調節(jié)回路，將推力和磁鏈的誤差作為PI控制器的輸入，利用定子磁鏈矢量角把產生的正交參考電壓分量進一步轉化到固定參考系下，采用空間電壓矢量調制代替?zhèn)鹘y(tǒng)的開關表生成所需的電壓矢量。磁鏈負載角和動子速度由磁鏈的正交分量計算得出，，不使用任何傳感器。搭建仿真模型，對所建立的電機數(shù)學模型和直接推力控制方法進行驗證，仿真結果表明，改進的直接推力控制可以得到快速、平滑的推力和磁鏈響應，提高了系統(tǒng)的控制性能，同時證明了新的永磁直線同步電機數(shù)學模型的正確性和可行性。 最后，為了解決電機控制系統(tǒng)受參數(shù)攝動和負載擾動所帶來的影響，并進一步降低磁鏈和推力脈動，提高系統(tǒng)動態(tài)響應性能和魯棒性，在新的PMLSM狀態(tài)模型的基礎上，引入永磁直線同步電機滑模變結構直接推力控制策略，并搭建了控制系統(tǒng)仿真模型。仿真結果顯示磁鏈誤差基本穩(wěn)定在零點，證明了系統(tǒng)的魯棒性和抗干擾能力，系統(tǒng)響應快；同時，系統(tǒng)脈動問題得到了改善。
[Abstract]:PMLSM (permanent Magnet Linear synchronous Motor) has been widely used in industrial automation, energy development and utilization for its unique advantages. The robust control mechanism of permanent magnet linear synchronous motor (PMLSM) has become a research hotspot in the field of motor control. Direct thrust control (DTC) is characterized by its novel control idea, simple motor model, direct control method and so on. More and more people pay attention to the direct thrust control of permanent magnet linear synchronous motor (PMLSM). Firstly, the development of linear motor is simply combed, then the permanent magnet linear synchronous motor is introduced, the structure, working principle and control strategy of PMLSM are summarized, and the development status of PMLSM direct thrust control is analyzed. The mathematical model of PMLSM is established. The direct thrust control theory of permanent magnet linear synchronous motor is introduced in detail. The thrust and flux control principle of direct thrust control is expounded. Secondly, in view of the problems of large pulsation, poor stability and slow response of traditional direct thrust control system, an improved direct thrust control method for permanent magnet linear synchronous motor (PMLSM) is presented in this paper. A new PMLSM mathematical model is established in this paper. The motor model is established in the stator flux coordinate system, and then the thrust and flux are decoupled. According to the linear relation between thrust and load angle, the thrust regulating loop is designed, and the error between thrust and flux is taken as the input of Pi controller. By using stator flux vector angle, the generated orthogonal reference voltage component is further transformed into a fixed reference frame. The space voltage vector modulation is used to replace the traditional switching table to generate the required voltage vector. The load angle and the velocity of the flux are calculated by the orthogonal component of the flux chain, and no sensors are used to build the simulation model. The simulation results show that the improved direct thrust control can get fast and smooth thrust and flux response, and improve the control performance of the system. At the same time, the correctness and feasibility of the new mathematical model of permanent magnet linear synchronous motor are proved. Finally, in order to solve the problem that the motor control system is affected by parameter perturbation and load disturbance, and further reduce flux and thrust pulsation, and improve the dynamic response performance and robustness of the system, a new PMLSM state model is proposed. The direct thrust control strategy of permanent magnet linear synchronous motor with sliding mode variable structure is introduced, and the simulation model of the control system is built. The simulation results show that the flux error is basically stable at 00:00, which proves the robustness and anti-interference ability of the system and the fast response of the system. At the same time, the system pulsation problem is improved.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM341

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