微型減速電機是(shi)一種由內齒(chi)(chi)(chi)(chi)(chi)圈(quan)、太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)、行星(xing)(xing)齒(chi)(chi)(chi)(chi)(chi)、行星(xing)(xing)架所(suo)構成(cheng)的驅動(dong)(dong)(dong)裝置行星(xing)(xing)齒(chi)(chi)(chi)(chi)(chi)輪通(tong)過出力(li)軸、內齒(chi)(chi)(chi)(chi)(chi)環及太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)相(xiang)互支撐而圍繞與太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)周圍，當輸(shu)入(ru)端驅動(dong)(dong)(dong)太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)時，可帶(dai)動(dong)(dong)(dong)行星(xing)(xing)齒(chi)(chi)(chi)(chi)(chi)輪自轉(zhuan)(zhuan)，同時行星(xing)(xing)齒(chi)(chi)(chi)(chi)(chi)在齒(chi)(chi)(chi)(chi)(chi)圈(quan)上做減速或(huo)者加(jia)速運動(dong)(dong)(dong)（這取決于太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)的齒(chi)(chi)(chi)(chi)(chi)數(shu)），太(tai)陽(yang)(yang)齒(chi)(chi)(chi)(chi)(chi)旋轉(zhuan)(zhuan)帶(dai)動(dong)(dong)(dong)輸(shu)出軸轉(zhuan)(zhuan)動(dong)(dong)(dong)，達到擴大扭力(li)，降低(di)轉(zhuan)(zhuan)速的作(zuo)用(yong)。

　????當驅動裝置（常見為電機）和減速機間裝配同心度很協調的時候，驅動裝置輸出軸所承受的僅僅是轉動力(電機扭矩)，運轉時也會很平順，不會出現很強烈的震動。但是在不同心的時候，電機輸出軸還要承受來自于減速機輸入端的徑向力也就是常說的彎矩。這個徑向力會使電機輸出軸受到徑向作用力，而且彎曲的方向會隨著輸出軸轉動不斷變化。如果同心度的誤差較大時，該徑向力會使電機輸出軸局部溫度過，長此以往下去，終將導致電機輸出軸因局部疲勞而折斷。同心度的誤差越大時，使直流減速馬達出現(xian)電機軸斷裂或者嚴重變形(xing)的現(xian)象會更突出。

　　  當電機(ji)(ji)輸出(chu)軸折斷彎曲的同時，減速(su)機(ji)(ji)輸入端同樣(yang)也會(hui)承(cheng)受來自于(yu)電機(ji)(ji)輸出(chu)軸的徑向力(li)(li)，如果這(zhe)個徑向力(li)(li)超出(chu)減速(su)機(ji)(ji)輸入端太陽齒的額定力(li)(li)矩的話，那(nei)么也將導致(zhi)減速(su)機(ji)(ji)輸入端產(chan)生(sheng)變形，從而導致(zhi)減速(su)機(ji)(ji)卡殼或者(zhe)軸承(cheng)變形異位。

　????所以，在裝備(bei)減(jian)速機(ji)與電機(ji)的過(guo)程中，兩者(zhe)同心度(du)(du)的調節十分重要，如果電機(ji)軸(zhou)和減(jian)速機(ji)輸(shu)入端(duan)同心，那么電機(ji)和精度(du)(du)減(jian)速機(ji)輸(shu)入端(duan)孔面間(jian)(jian)就會(hui)很吻(wen)合，它們的接觸面緊(jin)緊(jin)相貼，沒有徑向力(li)和變形空(kong)間(jian)(jian)。而裝配時如果不(bu)同心，那么接觸面之(zhi)間(jian)(jian)就會(hui)不(bu)吻(wen)合或有間(jian)(jian)隙，就有徑向力(li)并給變形提(ti)供了空(kong)間(jian)(jian)。