例:被驅(qū)動(dòng)設(shè)備所需功率為3KW,轉(zhuǎn)速=360r/min,工作12小時(shí)/天。均勻負(fù)載啟動(dòng)次數(shù)少,求電機(jī)型號(hào)!
答:(一) 電機(jī)選型
1、 假設(shè)選擇電動(dòng)機(jī)的轉(zhuǎn)速為1450r/min,計(jì)算減速比
i=n1/n2=1450/360=4.028≈4
2、減速機(jī)的級(jí)數(shù)為一級(jí)(3-10)
3、減速機(jī)效率η為96%
4、均勻負(fù)載且在啟動(dòng)次數(shù)少的情況下可選f1=1.25
5、電機(jī)功率為p1n
p1n≥p1 × f1=p2÷η×f1=3÷0.96×1.25=3.90625KW
6、根據(jù)轉(zhuǎn)速、功率確定電動(dòng)機(jī)型號(hào)
(二) 減速機(jī)選型
1、計(jì)算被驅(qū)動(dòng)設(shè)備的扭矩 T2
T2=9550×p1/n2=9550×3/360=79.58Nm
2、計(jì)算減速機(jī)輸出扭矩T2N
T2N≥T2×f1=79.58×1.25=99.475Nm
3、根據(jù)減速比、減速機(jī)輸出扭矩、輸入電機(jī)端尺寸、輸出設(shè)備端尺寸選擇合理的減速機(jī)。符合的減速機(jī)型號(hào)是 ZCF90-4-S2 (輸出扭矩為150、速比4、標(biāo)準(zhǔn)側(cè)隙)
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