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时间:2018-02-03
《胡虔生__电机学(第二版)习题答案》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、胡虔生《电机学》(第二版)习题解答胡虔生电机学(第二版)习题解答补充一:一台单相变压器U1N/U2N=220V/110V,当高压方加220V电压时空载电流为I0,主磁通为Φm。(1)若将X,a联在一起,在A,x端加330V电压,求此时的空载电流和主磁通为多少?(2)若将X,x联在一起,在A,a端加110V电压,求此时的空载电流和主磁通为多少?220解:U4.44fN220VAX1oo4.44fN1N22031k2N2NNNN12121N11022''3'顺串时:UUU4.44fN4.44fN4.44fN
2、330VAxAXax1o2o1o2'220oo4.44fN1'3''2因为磁通不变,所以磁势不变,INI(NN)NIIIo1o121ooo23''''1''逆联时:UUU4.44fN4.44fN4.44fN110VAaAXax1o2o1o2''220oo4.44fN1''1''''因为磁通不变,所以磁势不变,INI(NN)NII2Io1o121ooo2补充二:两台单相变压器,电压U1N/U2N=220V/110V,初级绕组匝数相等,但由于励磁阻抗不等(励磁阻抗角相同),使励磁电流相差一倍,I
3、0I=2I0II=0.8A,设磁路为线性,忽略初、次级漏阻抗压降,今将两变压器的初级绕组顺极性串联起来一次测加440V电压,问两变压器二次侧的空载电压是否相等,请给出具体数值。UU1N1N解:ZZmImIIIIoIoIII2IoIoIIUUZ1N1NmIIZZ2ZmImIImII2I2oIoII顺极性串联时,IO一样,忽略漏阻抗压降,有:UI(ZZ)I(Z2Z)3IZ1omImIIomImIomI1即有:IZUomI1314402440EIZU147(V)EIZU2293(V)1IomI11IIo
4、mII133331胡虔生《电机学》(第二版)习题解答E147E2931I1IIU73(V)U147(V)2I2IIk2k2由此可见,空载电压不相等。S2000S2000P44,2-5.解:NN(1)I1.82(A)I18.2(A)1N2NU1100U1101N2NI1.82I1.82*1N*1NZZ300.0497rr80.0132kkkkU1100U11001N1N**2*222XZr0.04970.01320.0478kkkI18.2I18.2*2N*2Nxx50.827rr
5、101.655LLLLU110U1102N2N0取UU0V,有I0.01j0.09A110U11001Nrjx1342j12074mmI0.01j0.091*1.82*1.82r13422.22x1207420.0mm11001100*(2)取U1j0,采用近似等效电路,有:2U*1j0I*20.53926.602**rjx1.655j0.0827LLU*I*[(r*r*)j(x*x*)](0.483j0.242)(1.668j0.857)1.0131.
6、1012kLkLU*1.0131.10I*10.050482.5600**rjx2.22j20.0mm***III0.57030.8102*pkN600P46,2-13.解:(1)r0.0048kS125000N**2*222xzr0.1050.00480.1049kkk22pppUU/3U000N1N1NrZm2S221b3I03(0.02N)20.02SNSN/(3U1N)SN3U1N222*rmp0UN/(0.02SN)p0133r2.66m222ZU/S0.02
7、S0.021250001b1NNN2胡虔生《电机学》(第二版)习题解答**U11**2*222z50;xzr502.6649.93m*mmmI0.020*(2)取U1j0,采用近似等效电路,有:2*I0.8j0.062U*I*(r*jx*)U*[(0.8j0.6)(0.0048j0.1049)1]1.06994.344012kk2U*1.06994.34401.06994.3440I*10.021482.6100*0z2.66j49.935086.95m**
8、*00II(I)0.021782.610.8j0.60.80279j0.62151.0152537
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