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??????????????? (1)
??? ????
???????
1??????????????????? B ?
A?60????B?120????C?180???? D?360????
2. ????????? C ? A??????????? B???????????
C????????????????- D????????????????????
3. ?220V?100W220V?25W???????????220V???????????? B ?
A?100W????? B?25W????? C????????? D?100W?25W????
4. ???????????????????????U??????V??????W?????????????????10?????????? A ?
A?30??B?10?? C?27.32??
5. ?????????????????????? uAB=2sin?t V??
?
C???????? UC ?? A ?
??
A? 220?90 V B ?380?90 V
?
220??90? V D?380??90 C ?
6?????????????????????????????????( C )?
A?3
B?2
C?1 D?
3
3
7. ????? 220 V ???????????380 V?????????????? ( A) ??A ??
B? ?
C?Y????? D ?Y??????
8?????????????????????????
uBC?2sin(?t?180)V?????uC? ( D )? A?2sin(?t?30)V B? 2sin(?t?30)V C? 2sin(?t?120)V D
??t?30)
9.???????????U?????uU?311sin(314t??)V?V??W??????? ?A? A?uV?311sin(314t?B?uV?311sin(314t?C?uV?311sin(314t?D?uV?311sin(314t?
?
3
)V)V)V)V
uW?311sin(314t?uW?311sin(314t?uW?311sin(314t?uW?311sin(314t?
?
3
)V )V )V )V
?
3
?
3
?
6
?
6
?
6
?
6
10????????????????????????????4A????????A ??
A?0B?4AC?8A D?12A
11.????????????????55???????4A??????380V??????????? A?? A?Y?? B???? C?Y??????D??????????
?????
1????????????????????????? ?? ???30??
?????U?????U?= U??2?????????????????Uabaaba?????I?????I?
???Iaabab
?
Ia?30 3.???????Y????380V?????????????????????
1 ????????????
?
4. ????????????????????22???????0.8???????????10A????????????? 1760w ?????? ?????? ?
5??????????????????? 6.??????????????????380V?????????????????10A????????6KW?????????? 220 V?????
103 A???????????????
? 319
8.?????????U?V?W???
?????
1????????????????????Ul=380V?????R=6?? ??:?????????????????????????
???????????????????????????? ????????380v????UA?220?0??UAB?380?30
?
?
IPA
UUA220?0?
???36.67?0?ILA?A?3?36.67??30??63.51??30?
RR6
2? ?????380V???????????????????????????????????I???????????
????????????????????????
380
ILY?IPY?
UP3
??22RY10?A?
IL??3
UPU380?3L??17.32R?R?38?A?
IL?ILY?IL??22?17.32?39.32?A?
????????????
??????????????????????
?
?UAB??V?
?Ua?220/0??V?
???????????????
?
?U220/0???IAY?Ia?a?22/0?RY10?A?
????????????????
?U380/30??Iab?AB?10/30?R?38?A?
????????????????
??3I?/?30???10/30??30??17.32/0?IL?ab?A?
??IL?ILY?IL??22/0??17.32/0??39.32/0??A?
? IL=39.32?A?
???
3???????????????????????UL=380V?????????????IL=2.2A?cos?=0.8??????????Z?
???????????????????????????????????
UL?p
??UL=380(V)?IL=2.2(A)
? UP=220(V), Ip=2.2(A),
Z?
UpI
?
p
???????
220
?1002.2???
???
???
R?ZCOS??100?0.8?80XL?
2
Z?R2?2?802?60
?? Z=80+j60???
4.????3.2????????????????????????????380V?????Ra?11??Rb=Rc=22????? ?1??????????????????????? ?2??????A??????????????? ?3??????A??????????????
?????????1-4???????
????????????_???
4-1. ?????????????????????????
?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
4-2. ???????????????
????????????????????????????????????????
4-3. ??????????????????PN ?3kW?????nN?2880r/min???
(1)?????(2)???????sN?(3)????TN?
??(1) ????n0?3000r/min??????????p?1? (2) sN?n0?n3000?2880??4% n03000
PN=9.95N?m nN(3) TN?9.55
4-4. ??Y112M-4????????????PN?4kW?????????UN?380V?nN?1440r/min?????IN?8.8A?????cos?N=0.82????N?84.5%???(1)????; (2)??????????P1N; (3)???????sN; (4)????TN? ??(1) ????n0?1500r/min??????????p?2? (2) P1N?PN
?N?4.73kW (3) sN?n0?n1500?1440??4% n01500
PN=26.5N?m nN(4) TN?9.55
4-5. ??Y132M-4???????????PN?7.5kW?????IN?15.4A?????
nN?1440r/min?????UN?380V?????????cos?N=0.85????????N?0.87?????Tst/????TN=2.2?????Ist/????IN?7.0?????Tm/????TN=2.2???(1)??????T1N?(2)????TN?(3)????????(4)????Ist?(5) ????Tst; (6) ????Tm?
??(1) ??????T1N?PN
?N?8.62kW (2) TN?9.55PN=49.74N?m nN
(3) sN?n0?n1500?1440??4% n01500
(4) Ist=7IN=107.8A
(5) Tst=2.2TN=109.43N?m
(6) Tm=2.2TN=109.43N?m
4-6. ?????????????s?1?????????I2????????????cos?2??
????????????????????????????????????????????????????????????????????5?7????????????????????????cos?2???????????????????
4-7. ???????????????????????????????????????
?????????????????????????????????????????????????????5?7???????????????????????????????????????????????????????????????????????????????
4-8. ????????????????????????
????????????T?kT
2U1sR2R2?(sX20)222 ?s???(sX20)2<<R2,(sX20)2????T???S??s???1??
22?T?S??????????????????T?S???(sX20)2>>R2?R2????
?????
T?S??
?S?SN??????????????????????nN????????TN???????????????????PN?
?S?Sm????????????????????Tm???????????T?
RU1S???????????????Sm?2?Tm?kT???Sm?R2????X202X20
?Tm?R2????Tm?U1????Sm?U1???????????R2?????????????????U1???T?S???????4.2.3??4.2.4???
?4.2.3??R2?T?S?? ?4.2.4??U1?T?S?? 222
4-9. ??????????????????????????????????????
?????????
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Y???????????????????????????????????
4-10. ??????????????
?????????1???????2?Y?????????3???????4?????????????????Y?????????????
4-11. ???????????????????????????????????????
?????????????????????Rst??????????????????????????????????????????????????????????????????????????????????????????????
4-12. ????????????????????????????????????? ?????????????????????????(??)????????????????????????????????????????????
4-13. ????????????????????????????????????????????????????????
??????????????????????????????????????????????????????????????????????????????????
4-14. ??????????????????????????????
????????????????(1)?????????(2)????????(3) ?????????????????????????????????????????????????????
4-15. ?????????????????????????Y??????????????????Y????????????????????
?????????????????Y????????Y??????1/3?????????????????????????????Y?????????????????????????????????Y????????????????????????????????????
4-16. ??????????????????????????????????? ????????????????????????????????????????
?????????????????????????????????????????????????????????????????????????????????????????
4-17. ????????????????????????????????????? ??
??????????????????????????Q??????KM???SB?????FR????FU???????????????Q???????????????SB2(????)???????KM???????????????????(????)???????????????SB2?????????????????????SB2????????KM?????(????)?????????????????????????????????????????????????????????????????????????????SB1(????)??????????????????????????????????
?????????????????????????????????????????????????????
4-18. ??????????????????????????????????? ??
?????????????????????
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发表于 2019-9-13 23:46:11