電機機械 直流電動機 - 考試
By Robert
at 2016-11-22T18:13
at 2016-11-22T18:13
Table of Contents
http://imgur.com/a/HRRRP
大家好,請問上題(一),負載下的電樞電流Ia(算轉速用),下列3法何者正確?
Pout=EaIa-Prot,題目不考慮Prot,所以Pout=EaIa (Ea非定值)
(1)解答:可是解答卻把Ea當定值--->PoutαIa-->Ia=40-(120/60)=38-->Ia'=50%*38=19A
(2)自解:利用題目給的額定值算出Pe=EaIa=(120-38*0.2-3)*38=109.4*38=4157.2,
又Ea'=120-3-0.2Ia'且Pe'=50%Pe=2078.6--> Pe'=117Ia-0.2Ia'^2-->Ia'=18.34A
(3)他人解:IL=40A-->IL'=50%IL=20A-->Ia'=20-2=18A
本來覺得解答怪怪的寫出自解(2),後來有人提供另一種算法(3),希望各位提供一下意見
謝謝
--
大家好,請問上題(一),負載下的電樞電流Ia(算轉速用),下列3法何者正確?
Pout=EaIa-Prot,題目不考慮Prot,所以Pout=EaIa (Ea非定值)
(1)解答:可是解答卻把Ea當定值--->PoutαIa-->Ia=40-(120/60)=38-->Ia'=50%*38=19A
(2)自解:利用題目給的額定值算出Pe=EaIa=(120-38*0.2-3)*38=109.4*38=4157.2,
又Ea'=120-3-0.2Ia'且Pe'=50%Pe=2078.6--> Pe'=117Ia-0.2Ia'^2-->Ia'=18.34A
(3)他人解:IL=40A-->IL'=50%IL=20A-->Ia'=20-2=18A
本來覺得解答怪怪的寫出自解(2),後來有人提供另一種算法(3),希望各位提供一下意見
謝謝
--
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考試
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