作為煤礦生產運輸的主要設備，帶式輸送機正朝著大運量、長距離、高帶速、節能化方向發展。通常長距離帶式輸送機需要多臺大功率電機同時驅動，而在電機選擇時，通常要考慮25%-40%的富裕系數；同時受到工作面采掘不平衡影響，輸送機載荷也是不均勻的，因而其實際運行過程中處于滿載、輕載、空載三種不同狀態之中。若輸送機帶速與其運量不相匹配，則會導致能源的浪費，如何減小輸送機運行過程中的能源消耗，降低運輸成本，對提高煤炭企業經濟效益具有重要作用。

長距離(li)帶式(shi)輸送(song)機(ji)(ji)由多(duo)臺(tai)交流(liu)變頻電(dian)動(dong)(dong)機(ji)(ji)驅動(dong)(dong)，受各種因(yin)(yin)素影響，會出現電(dian)動(dong)(dong)機(ji)(ji)功(gong)率不(bu)(bu)平(ping)(ping)(ping)衡(heng)(heng)現象，從(cong)而(er)導(dao)致電(dian)機(ji)(ji)負荷分配不(bu)(bu)均(jun)，嚴重時(shi)(shi)可能(neng)會燒毀電(dian)機(ji)(ji)。因(yin)(yin)而(er)需(xu)要采(cai)取(qu)(qu)一定措施(shi)對輸送(song)機(ji)(ji)功(gong)率平(ping)(ping)(ping)衡(heng)(heng)進行(xing)控制(zhi)。電(dian)機(ji)(ji)平(ping)(ping)(ping)衡(heng)(heng)受到靜(jing)態(tai)(tai)和動(dong)(dong)態(tai)(tai)兩類因(yin)(yin)素的影響，靜(jing)態(tai)(tai)因(yin)(yin)素取(qu)(qu)決于(yu)輸送(song)機(ji)(ji)原始(shi)設計(ji)參數，良(liang)(liang)好的設計(ji)可使(shi)靜(jing)態(tai)(tai)功(gong)率平(ping)(ping)(ping)衡(heng)(heng)達到良(liang)(liang)好的效果(guo)(guo)；動(dong)(dong)態(tai)(tai)因(yin)(yin)素即輸送(song)機(ji)(ji)運行(xing)過程中(zhong)瞬時(shi)(shi)不(bu)(bu)平(ping)(ping)(ping)衡(heng)(heng)狀(zhuang)態(tai)(tai)，對動(dong)(dong)態(tai)(tai)功(gong)率不(bu)(bu)平(ping)(ping)(ping)衡(heng)(heng)現象能(neng)夠及時(shi)(shi)做出響應則可取(qu)(qu)得(de)良(liang)(liang)好的效果(guo)(guo)。

影響帶式輸送(song)(song)機(ji)(ji)功率平衡靜(jing)態因(yin)素主要(yao)有：滾(gun)筒(tong)圍包角、輸送(song)(song)帶與滾(gun)筒(tong)間的(de)摩擦因(yin)素、電機(ji)(ji)特性、傳(chuan)動(dong)比(bi)及滾(gun)筒(tong)直徑差(cha)異等，因(yin)此輸送(song)(song)機(ji)(ji)在設計(ji)時應嚴格控制以上(shang)參(can)數；動(dong)態因(yin)素主要(yao)有：輸送(song)(song)機(ji)(ji)運行阻力、電動(dong)機(ji)(ji)輸出的(de)電磁轉矩等。

具體生(sheng)產實(shi)踐中，在輸送機(ji)(ji)(ji)靜態參(can)(can)(can)數已經確定(ding)后，可通(tong)過(guo)供電頻率(lv)來進行(xing)電動(dong)機(ji)(ji)(ji)功(gong)率(lv)平(ping)(ping)衡(heng)(heng)的(de)(de)(de)調節。傳(chuan)統電機(ji)(ji)(ji)功(gong)率(lv)平(ping)(ping)衡(heng)(heng)控制(zhi)(zhi)(zhi)有并行(xing)控制(zhi)(zhi)(zhi)和主從控制(zhi)(zhi)(zhi)兩種策略。并行(xing)控制(zhi)(zhi)(zhi)即對(dui)多臺電動(dong)機(ji)(ji)(ji)設(she)置(zhi)統一的(de)(de)(de)參(can)(can)(can)數，所有電動(dong)機(ji)(ji)(ji)按照設(she)定(ding)參(can)(can)(can)數運行(xing)，主從控制(zhi)(zhi)(zhi)即主要對(dui)主機(ji)(ji)(ji)參(can)(can)(can)數進行(xing)設(she)置(zhi)，而(er)從機(ji)(ji)(ji)通(tong)過(guo)對(dui)主機(ji)(ji)(ji)輸出(chu)進行(xing)跟蹤，實(shi)現(xian)同步(bu)運行(xing)。并行(xing)控制(zhi)(zhi)(zhi)具有抗(kang)干擾(rao)性(xing)較差(cha)的(de)(de)(de)缺點(dian)，而(er)主從控制(zhi)(zhi)(zhi)同步(bu)運行(xing)性(xing)差(cha)。基(ji)于(yu)耦合(he)補償的(de)(de)(de)功(gong)率(lv)平(ping)(ping)衡(heng)(heng)方法，通(tong)過(guo)對(dui)每臺電動(dong)機(ji)(ji)(ji)運行(xing)參(can)(can)(can)數變(bian)化(hua)值進行(xing)采集，對(dui)其運行(xing)參(can)(can)(can)數差(cha)異進行(xing)分析，針對(dui)性(xing)地進行(xing)補償。這種方法同時(shi)考慮了單機(ji)(ji)(ji)驅動(dong)系統給定(ding)轉速(su)與實(shi)際(ji)轉速(su)之間的(de)(de)(de)誤差(cha)及不(bu)同電機(ji)(ji)(ji)間的(de)(de)(de)同步(bu)誤差(cha)。只要運行(xing)系統中任何一臺電機(ji)(ji)(ji)發(fa)生(sheng)變(bian)化(hua)時(shi)，都會對(dui)整個系統發(fa)出(chu)反饋。

對(dui)于(yu)雙機(ji)(ji)(ji)驅動(dong)(dong)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)，通過(guo)控制器的雙向(xiang)補償作用，可提(ti)高系統(tong)的同步(bu)精度(du)。若兩臺電(dian)(dian)(dian)機(ji)(ji)(ji)分(fen)別處于(yu)發(fa)(fa)電(dian)(dian)(dian)態的電(dian)(dian)(dian)機(ji)(ji)(ji)載荷較(jiao)大時，說明此時輸(shu)送機(ji)(ji)(ji)對(dui)于(yu)電(dian)(dian)(dian)機(ji)(ji)(ji)而言是負載，需(xu)要(yao)增(zeng)(zeng)加牽(qian)引力，通過(guo)控制系統(tong)增(zeng)(zeng)大處于(yu)發(fa)(fa)電(dian)(dian)(dian)狀態的電(dian)(dian)(dian)機(ji)(ji)(ji)頻(pin)率，將其由(you)發(fa)(fa)電(dian)(dian)(dian)狀態轉(zhuan)(zhuan)為(wei)電(dian)(dian)(dian)動(dong)(dong)狀態；當處于(yu)發(fa)(fa)電(dian)(dian)(dian)狀態的電(dian)(dian)(dian)機(ji)(ji)(ji)載荷較(jiao)大時，說明此時輸(shu)送帶(dai)轉(zhuan)(zhuan)速(su)高，帶(dai)動(dong)(dong)電(dian)(dian)(dian)機(ji)(ji)(ji)鉆孔，因此需(xu)要(yao)減小電(dian)(dian)(dian)動(dong)(dong)狀態下的電(dian)(dian)(dian)機(ji)(ji)(ji)頻(pin)率，將其由(you)電(dian)(dian)(dian)動(dong)(dong)狀態轉(zhuan)(zhuan)為(wei)發(fa)(fa)電(dian)(dian)(dian)狀態，進行(xing)功率平衡控制。

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