TDM6.1-015-300速度分辯率造成的誤差將小于0.44mm/s,假設(shè)切紙機(jī)的最高線速度為2m/s,速度精度將達(dá)到萬分之二,完全可以滿足高速切紙機(jī)的要求。實際上,由于在本方案中,INV 2# 完全跟蹤INV 1# 轉(zhuǎn)速和位置,即使有速度分辨率誤差,對輸出切紙精度也無任何影響。 c、跟蹤速度增益K的分辨率對精度的影響 假設(shè)切紙長度為550~1350mm,最大車速為2000mm/s,送紙輥的直徑為400mm, 送紙機(jī)械減速比K1為16,切紙機(jī)械減速比K2為14,通過式(6)可以計算出K的變化范圍為0.814~1.998。 增益K的設(shè)定范圍為0.000~9.999,分辨率為0.001,如果采用2000P/R的編碼器,電機(jī)最大轉(zhuǎn)速為1440rpm,對應(yīng)最大脈沖頻率為48KHZ,對應(yīng)最大分辨誤差為24P/s(1/2*0.001*48KHz)。考慮在最大車速2m/s的情況下,最大絕對誤差應(yīng)該對應(yīng)最大切紙長度1.35m/s的時候,即 個脈沖,對應(yīng)絕對誤差根據(jù)式(9)計算為0.717mm。需要說明一點的是,此精度只影響設(shè)定長度,并不影響切紙長度的一致性。 四、 調(diào)試及注意問題 運行調(diào)試時,必須保證送紙電機(jī)和切紙電機(jī)處于完全停機(jī)狀態(tài),通過上位機(jī)或者外部端子,先讓切紙電機(jī)運行,后再讓送紙電機(jī)運行,同時給送紙電機(jī)設(shè)定頻率。送紙電機(jī)驅(qū)動變頻器的加減速時間可設(shè)定為30~60s,而切紙電機(jī)驅(qū)動變頻器在不過壓過流的情況下,可以設(shè)定最短的加減速時間,一般小于0.5s,在精度要求較高的場合,需要快速的起制動控制,有必要TDM6.1-015-300添加制動電阻或者制動單元(30KW以上變頻器)。 由于位置控制對于編碼器的抗干擾和可靠性有較高的要求,必須選用歐姆龍等廠家高可靠性產(chǎn)品,輸出電路形式為集電極開路輸出,工作電壓為24~30VDC,每轉(zhuǎn)脈沖數(shù)為2000。但要特別注意,上位機(jī)軟件在更改K的時候,需要設(shè)定為不存貯方式,防止常期多次存貯造成EEPROM的損壞。 五、結(jié)論 本文提出的方案具有切紙長度、相對精度與工作車速無關(guān)的優(yōu)點,易于實現(xiàn)PLC通信的分時控制和進(jìn)行切紙長度的隨意調(diào)整,可大大降低低速引紙速度,TDM6.1-015-300可達(dá)到額定車速1/50以下,降低了工人引紙的操作難度和強度,縮短低速引紙時間,提高了生產(chǎn)效率。另外,該方案還可以應(yīng)用在其他如造紙、起重等需要高精度同步跟蹤控制的場合,對于各種需要同步控制的場合有一定的參考價值。
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TDM6.1-015-300
TDM6.1-030-300
TDM7.1-015-300
TDM7.1-030-300
TDM1.2-030-300
TDM1.2-050-300
TDM1.2-100-300
TDM1.2-030-300-W0
TDM1.2-050-300-W1
TDM1.2-100-300-W1
TDM1.2-030-300-W1
TDM2.1-030-300-W1
TDM2.1-030-300-W0
TDM2.1-015-300-W0
TDM3.2-030-300-W1
TDM4.1-020-300-W0
TDM4.1-030-300-W1
TDM6.1-015-300-W0
TDM6.1-030-300-W1
TDM7.1-015-300-W0
TDM7.1-030-300-W1
TDM4.1-020-300-W0/S102
TDM1.2-100-300-W1-115
TDM1.2-030-300-W1-000/S105
TDM1.2-050-300-W1-000/S105
TDM1.2-100-300-W1-000/S105
TDM1.2-030-300-W1-220/S100
TDM1.2-100-300-W1-220/S100
TDM2.1-030-300-W1-220/S101
TDM1.2-050-300-W1-220/S102
TDM4.1-030-300-W1/S102
TDM1.2-100-300-W1-000/S102
TDM1.2-050-300-W1-000/S102
TDM1.2-030-300-W1-000/S102
TDM1.2-100-300-W1-000/S100
TDM3.3-030-300-W1
TDM1.3-030-300-W1-000
TDM1.3-050-300-W1-000
TDM1.3-100-300-W1-000
TDM7.1-015-300-W0/S102
TDM4.3-020-300-W0
TDM4.3-030-300-W1
TDM1.2-050-300-W1-000/S107
TDM1.3-030-300-W1-000/S102
TDM1.3-100-300-W1-000/S102
TDM1.3-100-300-W1-000/S100
TDM1.3-030-300-W1-000/S105
TDM1.3-050-300-W1-000/S105
TDM1.3-100-300-W1-000/S105
TDM7.1-030-300-W1/S102
TDM1.4-050-300-W1-000
TDM1.4-100-300-W1-000
TDM1.2-050-300-W1-000/S100
TDM1.2-030-300-W1-000/S107
TDM1.2-050-300-W1-000/S108
TFM3.1-050-300-W1-220
TFM3.1-050-300-W1-220
TFM3.1-050-300-W1-1
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