最近在設(shè)計(jì)一套機(jī)動(dòng)輥道，減速電機(jī)選用的疑惑

oscar30000

xuechaoqun 發(fā)表于 2012-3-5 21:50
算是可以算,，只是你提供的條件參數(shù)不全啊,，
要算就要先設(shè)定一些參數(shù)
假設(shè)：

不好意思,，直接啟動(dòng)是沒有問題的。
取電機(jī)7.5KW,，額定扭矩產(chǎn)生的加速度約為3.6>0.33,，直接驅(qū)動(dòng)是沒有問題的，不好意思�,。,。。,。,。。,。,。。,。,。。,。,。。,。,。。,。,。,。,。。,。,。。,。,。。,。,。。,。,。,。。,。,。。,。,。�

沈石頭

有個(gè)相似工況,，原滾動(dòng)摩擦系數(shù)是0.0002m,，但是考慮工況中存在滑動(dòng)摩擦的情況，系數(shù)放大至0.0008m,參考來(lái)自軋鋼機(jī)械的夾送輥設(shè)計(jì),，建議參考這方面資料,。工況也是輸送托輥靠輥?zhàn)訚L動(dòng)送料。

zjnyxhlove

最終歸結(jié)到滾動(dòng)摩擦與滑動(dòng)摩擦的區(qū)別問題,。

意可機(jī)電

p=安全系數(shù)*umg*v/效率,，對(duì)嗎

十年一夢(mèng)

　美國(guó)人討論摩擦系數(shù)的貼子：

proejuan (Mechanical) 8 Feb 07 9:47  
What is the coefficient of friction for calculate the pull force in a rail car?


civilperson (Structural) 8 Feb 07 10:55  
Steel on steel ranges from: High of 0.78 to Low of 0.05.  Use of sand box required on slippery surfaces such as leaves, oil, & ice.  Use 0.25 for design purposes, (2% maximum grade).


wiktor (Structural) 14 Feb 07 15:41  
Typically 0.005 i.e 5 lbs per 1000 lbs.You can find more details here:
https://atiam.train.army.mil/soldierPortal/atia/adlsc/view/public/7489-1/fm/4-01.41/chap10.htm#tab10-1


harrisj (Automotive) 8 Mar 07 10:38  
At a mu of .005, a 100-ton locomotive will achieve a drawbar pull of 1000 lbf. That's not much of a train.
The loco won't even make it up a 0.5% grade on its own, let alone pull anything else up it.
Something wrong here. Civilperson's numbers look more realistic, although I've never come across as high as 0.78 before.


civilperson (Structural) 8 Mar 07 11:29  
     Two different questions have been answered in the above postings.  The rolling resistance of a towed rail car is given as an average by witkor, the tractive effort as a drawbar pull by a locomotive is given by civilperson and harrisj.  The Army Manual cited by witkor has both answers. The STE, (starting tractive effort), is given as 0.3 to 0.2 with .25 as a design value and the CTE,(continuous tractive effort), is half of the STE.

于小濤

我覺得是否可以先用一個(gè)3KW的電機(jī)，試上8小時(shí),，再觀察發(fā)熱程度和實(shí)際較果,，這樣比算公式快多了。

wayyhlp

貨物被壓成18個(gè)微觀的小坑了吧,？這就不能用那個(gè)摩擦系數(shù)了    再者 貨物開始運(yùn)動(dòng)的時(shí)候有加速度  啟動(dòng)阻力比運(yùn)行阻力要大

青木飛揚(yáng)

機(jī)械這塊  計(jì)算好的東西部見的就正確,，很多加工  裝備的誤差   還有物體的誤差   都會(huì)影響到的。我就碰到這樣的問題

成形極限

這個(gè)要算加速度,，考慮電機(jī)負(fù)荷曲線等因素的,。理論功率是平穩(wěn)載荷的，動(dòng)載或加載條件下和電機(jī)的允許負(fù)荷要有一個(gè)平衡過程

天狐空幻

這個(gè) 問題 難嫩