電氣外文翻譯---基于dsp高速無刷直流電機控制使用直流環(huán)節(jié)電壓控制-電氣類-文庫吧在線文庫
【正文】 ve cost as well as plicate the motor configuration [1]. In particular, for a motor built in a pletely sealed pressor, a shaft sensor is difficult to apply due to the degradation of the sensor reliability in high temperature and the need for extra lead wires. Furthermore, these sensors, particularly Hall sensors, are temperature sensitive, limiting the operation of the motor to below about 75176。 degrees of active interval and is held in on state during the second 60176。 is only , which results in an unequal number of PWM pulses 3 or 4 during a 60176。interval. Thus, the ongoing and offgoing phase PWM schemes with the method in Figure 1(c) can be a preferred way for a high speed sensorless control. Nevertheless, there is still a problem. At high speed, only a few PWM pulses can be used for the speed control during a 60176。 . The stator currents are supplied by the 2phase excitation scheme where only two of the three phases are excited at any instant of time and one phase is conducted during 120176。 5 圖 1 PWM 開關周期之間的關系和運算可以交換即時 :(a)理想的變換 ,變換 (b)的情況下延遲和 (c)不規(guī)則的情況下切換頻率。在持續(xù)的和持續(xù)相 PWM 方案，這種不規(guī)則的開關頻率不會發(fā)生以來階段執(zhí)行 PWM 不斷改變每 60 度間隔。盡管這些減刑延遲可以忽略一個速度范圍，它具有重大影響的相電流響應和驅(qū)動器的性能在高速度。根據(jù)基于其使用的 PWM 調(diào)制方式 ,該控制技術可能導致減刑延遲或者一個不規(guī)則的開關頻率的電力設備在高速度傳感器控制。 傳感器存在的問題的速度控制方案 在現(xiàn)有的無傳感器控制方案 ,二段式激勵技術是 PWM(脈寬調(diào)制 )通常用于一個速度控制。永磁類型都有徑向非磁化轉(zhuǎn)子。反電動勢的感覺到用于集成電路和比較得到變換信號。然而， 一些優(yōu)勢的直流母線電壓超過傳統(tǒng)的兩相 PWM 在高轉(zhuǎn)速傳感器控制計劃控制計劃都沒有得到解決。同時 ,傳感器的精度也會受到安裝的準確性。此外，以有一個波形相位目前類似的矩形波和終端電壓更有效率的處理在位置檢測電路。 4．外文文獻翻譯原文由指導教師指定，同一指導教師指導的學生不得選用相同的外文原文。 格式按《華中科技大學武昌分校本科畢業(yè)設計 /論文撰寫規(guī)范》的要求撰寫。另一方面，使用的直流母線電壓控制方案，變頻器操作與方波 120176。特別是 ,為電動機建在一個完全密封壓縮機、軸傳感器是難以運用由于傳感器可靠性降低高溫需要額外的導線。最近，以提高驅(qū)動器 E 的效率，并提供所需的電流波形，一個傳感器控制計劃使用準電流源逆變器已提出 [6]。利用這項技術 ,因為電壓控制和變換就可以實現(xiàn)獨立 ,如運算可以交換延遲傳統(tǒng) PWM方法二段式激勵是 不存在的。 無刷直 流電機的無傳感器控制 一個無刷直流電機本文認為由永磁體安裝對轉(zhuǎn)子表面和三相集中而流離失所的定子 120 度。因此 ,該檢測方案本文采用。此外，基于位置的脈寬調(diào)制疊加，單極開關的方法是分類為持續(xù)的階段，將相位調(diào)制，上下開關開關脈寬調(diào)制，脈寬調(diào)制。然而 ,由于運算可以交換即時 以同步進行 ,與去 年底目前 PWM 周期開始下一個逆變器順序圖 1(b),這是一般使 4 用方法。因此 ,為了避免不良變換延遲 ,接下來的逆變器應用序列一旦變換信號中斷發(fā)生。僅為 ,導致不平等的 PWM 脈沖數(shù) 3 或 4 在 60 度間隔。C [1]. An absolute sensor is generally speed limited to about 6000 rpm and a resolver needs a special external circuit. Also, the sensor accuracy may be affected by the accuracy of the mounting. To overe these drawbacks, sensorless control techniques for a BLDC motor have been proposed [1_5]. There are two categories of position detection schemes, namely, the method using the back EMF of the motor [2] and themethod based on the detection of the conducting interval of freewheeling diodes [3]. In the existing sensorless control schemes, the PWM technique is generally used for a speed control. However, since the PWM and inverter mutation cannot be performed independently, a signi cant mutation delay may exist in a high speed region. Recently, to improve the drive effciency and provide the desired current waveform, a sensorless control scheme using a quasicurrent source inverter has been proposed [6]. Such a circuit arrangement is known as a variable DC link inverter [7].In this scheme, the inverter frequency is controlled to supply threephase rectangular current with a pulse width of 120176。interval, and in the offgoing phase PWM scheme, vice versa [3, 4].In the
畢業(yè)設計相關推薦
鄂ICP備17016276號-1