TDM1.3-030-300-W1-000無切削時(shí): F=μ*(W+fg) 切削時(shí): F=Fc+μ*(W+fg+Fcf) W:滑塊的重量(工作臺(tái)與工件)Kg μ:摩擦系數(shù) Fc:切削力的反作用力 fg:用鑲條固緊力 Fcf:由于切削力靠在滑塊表面作用在工作臺(tái)上的力(kg)即工作臺(tái)壓向?qū)к壍恼驂毫Α? 計(jì)算轉(zhuǎn)矩時(shí)下列幾點(diǎn)應(yīng)特別注意。 ?。╝)由于鑲條產(chǎn)生的摩擦轉(zhuǎn)矩必須充分地考慮。通常,僅僅從滑塊的重量和摩擦系數(shù)來計(jì)算的轉(zhuǎn)矩很小TDM1.3-030-300-W1-000的。請(qǐng)?zhí)貏e注意由于鑲條加緊以及滑塊表面的精度誤差所產(chǎn)生的力矩。 ?。╞)由于軸承,螺母的預(yù)加載,以及絲杠的預(yù)緊力滾珠接觸面的摩擦等所產(chǎn)生的轉(zhuǎn)矩均不能忽略。尤其是小型輕重量的設(shè)備。這樣的轉(zhuǎn)矩回應(yīng)影響整個(gè)轉(zhuǎn)矩。所以要特別注意。 ?。╟)切削力的反作用力會(huì)使工作臺(tái)的摩擦增加,以此承受切削反作用力的點(diǎn)與承受驅(qū)動(dòng)力的點(diǎn)通常是分離的。如圖所示,在承受大的切削反作用力的瞬間,滑塊表面的負(fù)載也增加。當(dāng)計(jì)算切削期間的轉(zhuǎn)矩時(shí),由于這一載荷而引起的摩擦轉(zhuǎn)矩的增加應(yīng)給予考慮。 ?。╠)摩擦轉(zhuǎn)矩受進(jìn)給速率的影響很大,必須研究測(cè)量因速度工作臺(tái)支撐物(滑塊,滾珠,壓力),滑塊表面材料及潤(rùn)滑條件的改變而引起的摩擦的變化。已得出正確的數(shù)值。 ?。╡)通常,即使在同一臺(tái)的機(jī)械上,隨調(diào)整條件,周圍溫度,或潤(rùn)滑條件等因素而變化。當(dāng)計(jì)算負(fù)載轉(zhuǎn)矩時(shí),請(qǐng)盡量借助測(cè)量同種機(jī)械上而積累的參數(shù),來得到正確的數(shù)TDM1.3-030-300-W1-000據(jù)。 3.負(fù)載慣量的計(jì)算。由電機(jī)驅(qū)動(dòng)的所有運(yùn)動(dòng)部件,無論旋轉(zhuǎn)運(yùn)動(dòng)的部件,還是直線運(yùn)動(dòng)的部件,都成為電機(jī)的負(fù)載慣量。電機(jī)軸上的負(fù)載總慣量可以通過計(jì)算各個(gè)被驅(qū)動(dòng)的部件的慣量,并按一定的規(guī)律將其相加得到。 1)圓柱體慣量 如滾珠絲杠,齒輪等圍繞其中心軸旋轉(zhuǎn)時(shí)的慣量可按下面公式計(jì)算: J=(πγ/32)*D4L(kg cm2) 如機(jī)構(gòu)為鋼材,則可按下面公式計(jì)算: J=(0.78*10-6)*D4L(kg cm2) 式中: γ材料的密度(kg/cm2) D圓柱體的直經(jīng)(cm) L圓柱體的長(zhǎng)度(cm) 2)軸向移動(dòng)物體的慣量工件,工作臺(tái)等軸向移動(dòng)物體的慣量,可由下面公式得出: J=W*(L/2π)2 (kg cm2) 式中: W直線移動(dòng)物體的重量(kg) L電機(jī)每轉(zhuǎn)在直線方向移動(dòng)的距離(cm) 3)圓柱體圍繞中心運(yùn)動(dòng)時(shí)的慣量如圖所示: 圓柱體圍繞中心運(yùn)動(dòng)時(shí)的慣量 屬于這種情況的例子:如大直經(jīng)的齒輪,為了減少慣量,往往在圓盤上挖出分布均勻的孔這時(shí)的慣量可以這樣計(jì)算: J=Jo+W*R2(kg cm2) 式中:Jo為圓柱體圍繞其中心線旋轉(zhuǎn)時(shí)的慣量(kgcm2) W圓柱體的重量(kg) R旋轉(zhuǎn)半徑(cm) 4)相對(duì)電機(jī)軸機(jī)械變速的慣量計(jì)算將上圖所示的負(fù)載慣量Jo折算到電機(jī)軸上的計(jì)算方法如下: J=(N1/N2)2Jo 式中:N1 N2為齒輪的齒數(shù) 4.電機(jī)加速或減速時(shí)的轉(zhuǎn)矩 電機(jī)加速或減速時(shí)的轉(zhuǎn)矩 1)按線性加減速時(shí)加速轉(zhuǎn)矩計(jì)算如下: Ta=(2πVm/60*104) *1/ta(Jm+JL)(1-e-ks。ta) Vr=Vm{1-1/ta.ks(1-e-ksta) Ta加速轉(zhuǎn)矩TDM1.3-030-300-W1-000(N.M) Vm快速移動(dòng)時(shí)的電機(jī)轉(zhuǎn)速(r/min) Ta加速時(shí)間(sec) Jm電機(jī)慣量(N.m.s2) JL負(fù)載慣量(N.m.s2) Vr加速轉(zhuǎn)矩開始減少的點(diǎn) Ks伺服系統(tǒng)位置環(huán)增益(sec-1) 電機(jī)按指數(shù)曲線加速時(shí)的加速轉(zhuǎn)矩曲線如下圖: 電機(jī)按指數(shù)曲線加速時(shí)的加速轉(zhuǎn)矩曲線 此時(shí),速度為零的轉(zhuǎn)矩To可由下面公式給出: To==(2πVm/60*104) *1/te(Jm+JL) Te指數(shù)曲線加減速時(shí)間常數(shù) 2)TDM1.3-030-300-W1-000當(dāng)輸入階段性速度指令時(shí),它的速度曲線與轉(zhuǎn)矩曲線如圖4所示。 這時(shí)的加速轉(zhuǎn)矩Ta相當(dāng)于To,可由下面公式求得(ts=ks), Ta==(2πVm/60*104)*1/ts(Jm+JL)。
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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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