直流減速電機(jī)的性能特點(diǎn)
由于體積和電刷換向器的限制,直流減速電動(dòng)機(jī)的轉(zhuǎn)速一般在3000-12000轉(zhuǎn)/分范圍內(nèi),轉(zhuǎn)速增加,電動(dòng)機(jī)的工作壽命將顯著降低。采用的精密低噪音電動(dòng)機(jī),內(nèi)部裝有壓敏電阻,以減少對(duì)環(huán)境的電磁干擾。
電動(dòng)機(jī)的工作壽命主要取決于電刷和換向器的機(jī)械磨損和電化學(xué)腐蝕,在額定的負(fù)載轉(zhuǎn)矩和速度條件下,可連續(xù)運(yùn)轉(zhuǎn)300到500小時(shí)。
齒輪箱的結(jié)構(gòu)和特點(diǎn)直流齒輪電動(dòng)機(jī)的負(fù)載轉(zhuǎn)矩對(duì)轉(zhuǎn)速、電流有著直接的關(guān)系,轉(zhuǎn)速隨負(fù)載的增大而線性降低,電流則線性增加。選用規(guī)格時(shí),應(yīng)盡量在其效率點(diǎn)附近工作,以獲得理想的運(yùn)轉(zhuǎn)性能、工作壽命和特性穩(wěn)定性。通常,直流齒輪電動(dòng)機(jī)的使用環(huán)境與微型直流電動(dòng)機(jī)相同,如有特殊需要,例如環(huán)境溫度、過載條件、電流限定等,必須事先說明。齒輪箱的工作壽命一般超過直流電動(dòng)機(jī)的工作壽命,通常可以達(dá)到1000到3000小時(shí)。
齒輪箱的總減速比一般在1:10到1:500范圍內(nèi)。經(jīng)過特殊設(shè)計(jì),可以達(dá)到1:1000或更大,但很大減速比的齒輪箱不允許“倒轉(zhuǎn)”,即不能以齒輪箱的輸出軸作為主動(dòng)軸,強(qiáng)行倒轉(zhuǎn)。
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