【正文】 ell force or drive force feedback for torque control. On some plex systems, It is desirable to have the closed loop control system adjust itself for various encountered conveyor conditions. This is termed Adaptive Control. These extremes can involve vast variations in loadings, temperature of the belting, location of the loading on the profile, or multiple drive options on the conveyor. There are three mon adaptive methods. The first involves decisions made before the start, or 39。Restart Conditioning39。. At start, the belt speed is measured versus time. This is pared with two limiting belt speed curves that are retained in control system memory. The first curve profiles the empty belt when accelerated, and the second one the fully loaded belt. Thus, if the current speed versus time is lower than the loaded profile, it may indicate that the belt is overloaded, impeded, or drive malfunction. If the current speed versus time is higher than the empty profile, it may indicate a broken belt, coupling, or drive malfunction. In either case, the current start is aborted and an alarm issued.CONCLUSIONThe best belt starting system is one that provides acceptable performance under all belt load Conditions at a reasonable cost with high reliability. No one starting system meets all needs. The belt designer must define the starting system attributes that are required for each belt. In general, the AC induction motor with full voltage starting is confined to small belts with simple profiles. The AC induction motor with reduced voltage SCR starting is the base case mining starter for underground belts from small to medium sizes. With recent improvements, the AC motor with fixed fill fluid couplings is the base case for medium to large conveyors with simple profiles. The Wound Rotor Induction Motor drive is the traditional choice for medium to large belts with repeated starting duty or plex profiles that require precise torque control. The DC motor drive, Variable Fill Hydrokinetic drive, and the Variable Mechanical Transmission drive pete for application on belts with extreme profiles or variable speed at running requirements. The choice is dependent on location environment, petitive price, operating energy losses, speed response, and user familiarity. AC Variable Frequency drive and Brush less DC applications are limited to small to medium sized belts that require precise speed control due to higher present costs and plexity. However, with continuing petitive and technical improvements, the use of synthesized waveform electronic drives will expand.煤礦業(yè)帶式輸送機(jī)幾種軟起動(dòng)方式的比較邁克爾簡介運(yùn)行帶式運(yùn)送機(jī)的動(dòng)力必須由驅(qū)動(dòng)滑輪產(chǎn)生，通過滑輪和傳送帶之間的摩擦力來傳遞。因?yàn)樵O(shè)計(jì)過程中沒有詳盡研究傳送帶啟動(dòng)和停止階段的受力情況，所有的安全措施都集中在穩(wěn)定運(yùn)行階段（Harrison 1987）。毫無控制的加速度產(chǎn)生的動(dòng)力能夠引起帶式傳送機(jī)系統(tǒng)產(chǎn)生諸多不良問題，比如上下曲線運(yùn)動(dòng)、過度傳送帶提升運(yùn)動(dòng)、滑輪和傳送帶打滑、運(yùn)輸原料的溢出和傳送帶結(jié)構(gòu)。傳送帶設(shè)計(jì)師必須控制開始加速度防止過度張緊在傳送帶織品和力量在皮帶傳動(dòng)系統(tǒng). 強(qiáng)加速度力量可能有害地影響傳送帶織品，傳送帶接合，驅(qū)動(dòng)皮帶輪，更加無所事事的滑輪, 軸, 軸承, 速度還原劑, 并且聯(lián)結(jié)。軟起動(dòng)結(jié)構(gòu)評(píng)估標(biāo)準(zhǔn)什么是最佳的皮帶輸送機(jī)驅(qū)動(dòng)系統(tǒng)? 答案取決于許多變量。它重要, 傳送帶設(shè)計(jì)員審查各個(gè)系統(tǒng)要素的適用性對(duì)特殊申請(qǐng)。為這論述, 我們假設(shè)那皮帶傳動(dòng)系統(tǒng)范圍從分?jǐn)?shù)馬力對(duì)千位的多個(gè)馬力。范圍分部入這些組是整個(gè)地任意的。傳送帶設(shè)計(jì)員設(shè)法限制開始的扭矩到?jīng)]有比150% 運(yùn)行中。一個(gè)理想的開始的控制系統(tǒng)會(huì)適用于資格整個(gè)傳送帶的扭矩傳送帶休息由問題的脫離決定, 或運(yùn)動(dòng), 然后扭矩相等與傳送帶的運(yùn)動(dòng)需求以負(fù)荷加上恒定的扭矩從休息加速系統(tǒng)要素的慣性對(duì)最終奔跑速度。一條空傳送帶正常存在最小的必需的扭矩為脫離和加速度, 當(dāng)一條充分地被裝載的傳送帶存在最高的必需的扭矩。各個(gè)起始時(shí)間熱量負(fù)荷依靠相當(dāng)數(shù)量傳送帶負(fù)荷和起始時(shí)間的期限。有一個(gè)直接關(guān)系在熱量評(píng)級(jí)為被重復(fù)的起始時(shí)間和費(fèi)用之間。這是有用的當(dāng)驅(qū)動(dòng)器負(fù)荷必須與其它驅(qū)動(dòng)器被共享,傳送帶被使用當(dāng)處理飼養(yǎng)者為被表達(dá)的物料的費(fèi)率控制, 傳送帶速度被優(yōu)選為貨車使用費(fèi)費(fèi)率,傳送帶被使用以慢速運(yùn)輸人工或材料, 或傳送帶運(yùn)行緩慢的檢驗(yàn)或移動(dòng)速度為維護(hù)目的。沒有所有驅(qū)動(dòng)系統(tǒng)有能力接受被重新生成的能量從負(fù)荷。驅(qū)動(dòng)系統(tǒng)可能接受有些巨大的被重新生成的能量為申請(qǐng)嗎? 驅(qū)動(dòng)系統(tǒng)控制或必須調(diào)整相當(dāng)數(shù)量減速的強(qiáng)制在翻修期間嗎?翻修發(fā)生當(dāng)運(yùn)行和開始? 維護(hù)和支持系統(tǒng)。一些驅(qū)動(dòng)器要求支持系統(tǒng)譬如流通的油為潤滑油、冷卻空氣或水, 環(huán)境塵土過濾, 或計(jì)算機(jī)儀器工作。費(fèi)用使力量運(yùn)行驅(qū)動(dòng)器也許廣泛變化用不同的地點(diǎn)。但是, 機(jī)械, 經(jīng)濟(jì), 和功能需求經(jīng)常需要對(duì)復(fù)雜驅(qū)動(dòng)器的用途。軟起動(dòng)驅(qū)動(dòng)控制邏輯各個(gè)驅(qū)動(dòng)系統(tǒng)將要求一個(gè)控制系統(tǒng)調(diào)控開始的機(jī)制。 這個(gè)方法假定, 控制設(shè)計(jì)師充分地塑造了驅(qū)動(dòng)系統(tǒng)表現(xiàn)在傳動(dòng)機(jī)。 常數(shù)在數(shù)學(xué)模型與被測量的可變物有關(guān)對(duì)系統(tǒng)驅(qū)動(dòng)反應(yīng)被命名定調(diào)的常數(shù)。 這被命名能適應(yīng)的控制 。 如果傳送帶被裝載, 控制系統(tǒng)會(huì)應(yīng)用資格力量在攤位之下使較少時(shí)刻和供應(yīng)充足的扭矩及時(shí)地充分地加速傳送帶。 的決定。在開始, 傳動(dòng)機(jī)必須被裝載。在開始, 傳送帶速度被測量對(duì)時(shí)間。 如果當(dāng)前的速度對(duì)時(shí)間比空間的外形高級(jí), 它也許表明一條殘破的傳送帶結(jié)合或驅(qū)動(dòng)故障。傳送帶設(shè)計(jì)者必須為每個(gè)傳送帶設(shè)計(jì)啟動(dòng)系統(tǒng)屬性。對(duì)于那些大、中型而且需要重復(fù)啟動(dòng)的復(fù)雜結(jié)構(gòu)傳送帶，繞線轉(zhuǎn)子發(fā)動(dòng)機(jī)驅(qū)動(dòng)是常用的選擇。但是，隨著持續(xù)的競爭和技術(shù)進(jìn)步，波形綜合技術(shù)的電子驅(qū)動(dòng)器的使用將越來越廣。