針對(duì)伺服系統(tǒng)矢量控制系統(tǒng)，提出了一種可以補(bǔ)償死區(qū)誤差電壓并消除零電流鉗位效應(yīng)的死區(qū)補(bǔ)償方法。在分析了影響死區(qū)效應(yīng)的因素以及等效死區(qū)時(shí)間的表達(dá)式的基礎(chǔ)上，采用平均死區(qū)時(shí)間補(bǔ)償法，在兩相靜止軸系中對(duì)等效死區(qū)時(shí)間產(chǎn)生的誤差電壓進(jìn)行了補(bǔ)償。為了提高電流極性檢測(cè)的準(zhǔn)確性，利用旋轉(zhuǎn)軸系中的勵(lì)磁電流和轉(zhuǎn)矩電流分量經(jīng)過坐標(biāo)反變換，判斷電流在兩相靜止軸系所處的扇區(qū)來決定需要施加的補(bǔ)償電壓。另外為了更好地消除由于死區(qū)時(shí)間而產(chǎn)生的零電流鉗位效應(yīng)，將一種消除零電流鉗位效應(yīng)的方法結(jié)合到上述補(bǔ)償方法中。最后通過TMS320F2812 DSP芯片來實(shí)現(xiàn)補(bǔ)償算法，并在11kW伺服電機(jī)矢量控制系統(tǒng)中驗(yàn)證了補(bǔ)償算法的有效性。
ABSTRACT: A dead-time compensation strategy is presented to compensate dead-time error-voltage and eliminate zero-current clamping effect for servo motor vector control system. The factor influencing dead-time effect is analyzed, and expression of equivalent dead time is deduced. Average dead-time compensation technique is adopted to compensate error-voltage at two-phase stationary frame. To improve accuracy of detection of current direction, components of magnetizing current and torque current are transformed into two-phase stationary frame. Therefore compensating voltage vector can be decided according to the sector the current vector is locating. In addition, a kind of zero-current clamping effect eliminating scheme is adopted combining with the above compensation method to improve the compensation performance. The proposed compensation method is performed with TMS320F2812 DSP chip. Experimental results demonstrate the efficiency of the dead-time compensation method in 11kW servo motor vector control system.
關(guān)鍵詞：伺服系統(tǒng)，空間矢量PWM，死區(qū)效應(yīng)，零電流鉗位，補(bǔ)償