最近在設計一套機動輥道，減速電機選用的疑惑

oscar30000

xuechaoqun 發表于 2012-3-5 21:50
算是可以算，只是你提供的條件參數不全啊，
要算就要先設定一些參數
假設：

不好意思，直接啟動是沒有問題的。
取電機7.5KW，額定扭矩產生的加速度約為3.6>0.33，直接驅動是沒有問題的，不好意思！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！

沈石頭

有個相似工況，原滾動摩擦系數是0.0002m，但是考慮工況中存在滑動摩擦的情況，系數放大至0.0008m,參考來自軋鋼機械的夾送輥設計，建議參考這方面資料。工況也是輸送托輥靠輥子滾動送料。

zjnyxhlove

最終歸結到滾動摩擦與滑動摩擦的區別問題。

意可機電

p=安全系數*umg*v/效率，對嗎

十年一夢

　美國人討論摩擦系數的貼子：

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3KW的電機，試上8小時，再觀察發熱程度和實際較果，這樣比算公式快多了。

wayyhlp

貨物被壓成18個微觀的小坑了吧？這就不能用那個摩擦系數了    再者 貨物開始運動的時候有加速度  啟動阻力比運行阻力要大

青木飛揚

機械這塊  計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   都會影響到的。我就碰到這樣的問題

成形極限

這個要算加速度，考慮電機負荷曲線等因素的。理論功率是平穩載荷的，動載或加載條件下和電機的允許負荷要有一個平衡過程

天狐空幻

這個 問題 難嫩