1、电动电动VT1和和VT2的驱动电压大的驱动电压大小相等,方向相反,即小相等,方向相反,即Ub1=Ub2。当电机在电动状。当电机在电动状态下运行时,平均电流应为态下运行时,平均电流应为正值,一个周期分两段。正值,一个周期分两段。在在0tton时,时,Ub1为正,为正,VT1饱和导通;饱和导通;Ub2为负,为负,VT2截止。在截止。在tontT时,时,Ub1和和Ub2都变换极性,都变换极性,VT1截止,但截止,但VT2不能导通。因不能导通。因此,此,VT1,VD2交替导通。而交替导通。而VT2始终不通。始终不通。电动运行onttT onttT 制动状态轻载运行第第1阶段阶段,在,在 0 t ton
2、 期间,期间,Ug1、Ug4为正,为正,VT1、VT4导通,导通,Ug2、Ug3为负,为负,VT2、VT3截止,电流截止,电流 id 沿回路沿回路1流通,电动机流通,电动机M两端电压两端电压UAB=+Us;第第2阶段阶段,在,在ton t T期间,期间,Ug1、Ug4为负,为负,VT1、VT4截止,截止,VD2、VD3续流,续流,并钳位使并钳位使VT2、VT3保持截止,电流保持截止,电流 id 沿回路沿回路2流通,电动流通,电动机机M两端电压两端电压UAB=Us;*psndee(1)(1)K K URInCKCK*psndee(1)(1)K K URInCKCK*psndee(1)(1)K K
3、 URInCKCK*psncompssdee()()(1)(1)K K UURK K R InCKCK*psncom0e()(1)K K UUnCK有有 无无 max1500/minonr0maxmin1500 1511150 15NoNnnDnnmin15100%10%150Nonsnmin150/minonr15/minNnr11500 0.023.06/min(1)10(1 0.02)Ncn snrDS11500 0.023.06/min(1)10(1 0.02)Ncn snrDS1001131.73.06opclnkn1opclnkn1opclnkn8*16/min1opclopnnn
4、rk131opclclnknn(15 1)16OPOPDDD(1 30)31OPOPDDD 311.9416DD16*84.13/min31clnr1500 10%8.33/min120 90%Ncln snrDs2401127.88.33Nopclnkn 3.95/min1Ncln snrDs24011 59.763.95Nopclnkn 220 12.5 1.20.137min/1500NNaeNUI RCVnn12.51.2 1.5246.9/min0.137NopeI RnrC15000.18.33/min120 10.1Ncln SnrDS,dNNIInn150.01min/1500
5、nNUVnn128.64opclnkn28.64*0.13711.190.01*35epskCkk2dblNII1.2dcrNII22 12.52522.51.21.2 12.515ncomdblNscomcomdcrNsUUIIARUvUIIAR1.5SR 2.7arecRRR10.93SRR1.213.5comNSUI RV13.5*22.51.67iiKK*1000150.015nUn20094 0.150.2051000NNaeNUI RCn94(0.150.3)205.440.205dopeI RnC总1000 0.15.556/min(1)20(1 0.1)Ncln SnrDS1,
6、35.95opclnKkn()200nnpsNrecUU k kI R0.0145335.950.205913400.01453epskckk1013 20260PRK RK1.51010.17.33;7.41.11.5NNNNIVIXVVIXI取*0201*0120:;:*()*nincnincUUVSUUVSRRRRRRUUVSUURR由结构图可知为稳压管稳压值即0*22()*;(1)(1)(1):*10,0/min20013*40*15 13*40*(107.4)*1.5*94*0.4523.44;3.6psipsndeeeiiRk k UVSk k UI RRnckckckUUV nr
7、RRKK总由带截止负反馈的系统当在最高转速运行时,堵转电流达到最大,堵转时取220 15.6 1.50.1311 min/1500NNaeNUI RCVrU15.6(1.51)297.48/min0.1311dNeI RnrC100%85.6%NNNDnsnD n 当当D=30时时 1500 10%5.56/min(1)30(1 0.1)Ncln SnrDS297.48153.552.55.56opclnkkn100.0067/min1500nNnUUrnU300/5/56130/350.0067/0.13psekkkC182.25/min(1)NrecNaNeeI RI RnrCKC1100%78.3%1NNsnD n0.050.01852.7LLTsR0.050.01852.7lLTsR21.62.70.0615303753750.1370.137memGD RTsC C0.0033STs22()0.0615(0.0185 0.0033)0.003323.10.0185 0.0033mlSSlST TTTKTT28.64K