開關(guān)磁阻電機微步直接轉(zhuǎn)矩控制系統(tǒng)的研究
發(fā)布時間：2018-11-02 10:01
【摘要】：開關(guān)磁阻電機具有結(jié)構(gòu)簡單、造價低廉、調(diào)速性能優(yōu)越等優(yōu)點,應(yīng)用范圍越來越廣泛,但是電機固有的轉(zhuǎn)矩波動大的缺點阻礙了其大規(guī)模應(yīng)用。在借鑒其他控制方法的基礎(chǔ)上,本文提出了一種新的抑制轉(zhuǎn)矩波動的控制方法——微步直接轉(zhuǎn)矩控制。本控制策略融合了微步控制、直接轉(zhuǎn)矩控制、轉(zhuǎn)矩分配控制三種控制思想。 本文以8/6極四相開關(guān)磁阻電機為例,在分析每相繞組產(chǎn)生轉(zhuǎn)矩的正負、大小、變化趨勢等規(guī)律的基礎(chǔ)上,把360°的機械角度周期劃分為6個電角度周期,把每個電角度周期又細化分為8個區(qū)間,在每個區(qū)間內(nèi)采取相應(yīng)的控制方法進行控制,體現(xiàn)了微步控制思想。 在每個區(qū)間內(nèi),四相繞組中總有兩相繞組產(chǎn)生正向轉(zhuǎn)矩、兩相繞組產(chǎn)生負向轉(zhuǎn)矩,電機運行時使產(chǎn)生正向轉(zhuǎn)矩的兩相繞組共同產(chǎn)生電機總輸出轉(zhuǎn)矩。但是兩相繞組不是均衡的分擔總轉(zhuǎn)矩。為了減小即將關(guān)斷或剛剛導(dǎo)通的繞組由于轉(zhuǎn)矩-電流的嚴重非線性引起的轉(zhuǎn)矩波動,該相繞組電流應(yīng)維持在較小數(shù)值,這樣該相繞組分擔的轉(zhuǎn)矩必然較小,而另外一相繞組轉(zhuǎn)矩-電流非線性不嚴重,其電流和分擔的轉(zhuǎn)矩都較大,這樣就減小了電機輸出轉(zhuǎn)矩的波動,體現(xiàn)了轉(zhuǎn)矩分配控制思想； 在反饋控制中,直接以電機的輸出轉(zhuǎn)矩作為反饋量,形成轉(zhuǎn)矩閉環(huán)負反饋控制。根據(jù)轉(zhuǎn)矩偏差與要調(diào)節(jié)相繞組的單位轉(zhuǎn)矩調(diào)節(jié)電流的乘積,計算出要改變的相繞組電流值,進而定量的調(diào)節(jié)繞組電流,使電機輸出轉(zhuǎn)矩等于期望轉(zhuǎn)矩,轉(zhuǎn)矩調(diào)節(jié)的周期很短,能在一定程度上抑制轉(zhuǎn)矩波動,體現(xiàn)了直接轉(zhuǎn)矩控制思想。 在simulink中搭建了仿真模型,對提出的微步直接轉(zhuǎn)矩控制策略進行仿真驗證,本策略確實可以有效減小電機的轉(zhuǎn)矩波動。此外還制作了以DSP+CPLD為控制核心、IGBT和快恢復(fù)二極管為功率器件的電機控制器硬件,對提出的控制策略進行了初步的實驗。
[Abstract]:Switched reluctance motor (SRM) has many advantages such as simple structure, low cost and superior speed regulation performance. Its application range is more and more extensive, but its large scale application is hindered by its inherent shortcomings of large torque fluctuation. Based on the reference of other control methods, a new control method of torque ripple suppression, micro-step direct torque control, is proposed in this paper. This control strategy combines three control ideas: micro step control, direct torque control and torque distribution control. In this paper, taking 8 / 6 pole four phase switched reluctance motor as an example, on the basis of analyzing the positive and negative torque, the size of each phase winding and the changing trend, the mechanical angle period of 360 擄is divided into six electric angle cycles. Each electric angle period is further divided into 8 sections, and the corresponding control method is adopted in each interval, which embodies the idea of micro-step control. In each section, there are two phase windings that produce positive torque, two phase windings produce negative torque, and the two phase windings which produce positive torque together produce the total output torque of the motor. But the two-phase winding is not a balanced share of the total torque. In order to reduce the torque ripple caused by the serious nonlinearity of torque current in the winding that is about to be turned off or just switched on, the current of the phase winding should be maintained at a lower value, so that the torque shared by the phase winding must be smaller. The other phase winding torque-current nonlinearity is not serious, its current and share torque are larger, thus reducing the motor output torque ripple, reflecting the torque distribution control idea; In the feedback control, the output torque of the motor is taken as the feedback directly, and the torque closed-loop negative feedback control is formed. According to the product of the torque deviation and the unit torque regulation current of the phase winding to be adjusted, the current value of the phase winding to be changed is calculated, and then the winding current is adjusted quantitatively, so that the output torque of the motor is equal to the expected torque, and the period of torque regulation is very short. It can restrain torque ripple to a certain extent and embodies the idea of direct torque control. The simulation model is built in simulink, and the simulation results show that the proposed strategy can effectively reduce the torque ripple of the motor. In addition, the hardware of the motor controller with DSP CPLD as the control core and IGBT and fast recovery diode as the power device is made, and the proposed control strategy is preliminarily tested.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM352
本文編號：2305708
[Abstract]:Switched reluctance motor (SRM) has many advantages such as simple structure, low cost and superior speed regulation performance. Its application range is more and more extensive, but its large scale application is hindered by its inherent shortcomings of large torque fluctuation. Based on the reference of other control methods, a new control method of torque ripple suppression, micro-step direct torque control, is proposed in this paper. This control strategy combines three control ideas: micro step control, direct torque control and torque distribution control. In this paper, taking 8 / 6 pole four phase switched reluctance motor as an example, on the basis of analyzing the positive and negative torque, the size of each phase winding and the changing trend, the mechanical angle period of 360 擄is divided into six electric angle cycles. Each electric angle period is further divided into 8 sections, and the corresponding control method is adopted in each interval, which embodies the idea of micro-step control. In each section, there are two phase windings that produce positive torque, two phase windings produce negative torque, and the two phase windings which produce positive torque together produce the total output torque of the motor. But the two-phase winding is not a balanced share of the total torque. In order to reduce the torque ripple caused by the serious nonlinearity of torque current in the winding that is about to be turned off or just switched on, the current of the phase winding should be maintained at a lower value, so that the torque shared by the phase winding must be smaller. The other phase winding torque-current nonlinearity is not serious, its current and share torque are larger, thus reducing the motor output torque ripple, reflecting the torque distribution control idea; In the feedback control, the output torque of the motor is taken as the feedback directly, and the torque closed-loop negative feedback control is formed. According to the product of the torque deviation and the unit torque regulation current of the phase winding to be adjusted, the current value of the phase winding to be changed is calculated, and then the winding current is adjusted quantitatively, so that the output torque of the motor is equal to the expected torque, and the period of torque regulation is very short. It can restrain torque ripple to a certain extent and embodies the idea of direct torque control. The simulation model is built in simulink, and the simulation results show that the proposed strategy can effectively reduce the torque ripple of the motor. In addition, the hardware of the motor controller with DSP CPLD as the control core and IGBT and fast recovery diode as the power device is made, and the proposed control strategy is preliminarily tested.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM352
【參考文獻】
相關(guān)期刊論文 前4條
1 程勇;林輝;;五電平拓撲下開關(guān)磁阻電機直接瞬時轉(zhuǎn)矩控制[J];電機與控制學報;2011年04期
2 周素瑩;林輝;;減小開關(guān)磁阻電機轉(zhuǎn)矩脈動的控制策略綜述[J];電氣傳動;2008年03期
3 霍紅義,李炳玲,李雷軍,孟憲軍;幾種新型的SRM功率變換器[J];煤;2002年01期
4 李大威;王勉華;劉春元;;開關(guān)磁阻電機的直接瞬時轉(zhuǎn)矩控制系統(tǒng)設(shè)計與仿真[J];電機與控制應(yīng)用;2011年02期
相關(guān)博士學位論文 前1條
1 孟潤泉;新型SRD功率變換技術(shù)研究[D];太原理工大學;2010年
，本文編號：2305708
本文鏈接：http://www.lk138.cn/kejilunwen/dianlilw/2305708.html
最近更新
教材專著
