1- amaliy mashg’ulot. Transformatorlarning parametrlarini hisoblash

2- Amaliy mashg’ulot. Asinxron motorlarning parametrlarini hisoblash
Uch fazali rotori qiska tutashgan asinxron motorni nominal quvvati P₂, nominal kuchlanishi U_n, rotorni nominal aylanish chastotasi n_n ayl/min, nominal F.I.K. η_n, nominal quvvat koeffisienti cos φ_n. Yurgizish tokini karraligi I_yur/I_n, o‘ta yuklantirish koeffisienti λ 2-jadvalda berilgan.

Quyidagilar hisoblansin:

1) motorni istemol quvvati;

2) Nominal va kritik moment;

3) Yurgizish toki;

4) nominal va kritik sirpanish.

2-jadval.

Vari-ant	Un, V	Pn, kVt	nn ayl/min	ηn,	Cos φn	λ	Iyur Inom	p
1	220	0,8	890	0,78	0,86	1	5,5	3
2	220	1,1	920	0,79	0,87	1	6,0	3
3	220	1,5	950	0,8	0,88	1	6,0	3
4	220	2,2	980	0,82	0,88	1	6,5	3
5	380	3,0	1000	0,83	0,89	1	7,0	2
6	220	4,0	1100	0,84	0,89	1	7,0	2
7	220	5,5	1200	0,85	0,88	1	7,0	2
8	380	7,5	1350	0,86	0,89	1	7,0	2
9	380	10	1420	0,87	0,89	2	7,0	2
10	220	13	1500	0,88	0,88	2	7,0	2
11	220	17	2000	0,88	0,89	2	7,0	2
12	220	22	2500	0,88	0,89	2	7,0	1
13	220	30	2500	0,88	0,88	2	7,0	1
14	220	40	2000	0,88	0,89	2	7,0	2
15	380	55	2000	0,88	0,89	2	7,0	2
16	380	75	3000	0,90	0,90	2	7,0	1
17	380	100	3000	0,92	0,91	2	7,0	1
18	380	10	1420	0,88	0,89	2	7,0	2
19	380	13	1500	0,88	0,88	2	7,0	2
20	380	17	2000	0,88	0,89	2	7,0	2
21	380	22	2500	0,88	0,89	2	7,0	1
22	380	30	2500	0,9	0,88	2	7,0	1
23	380	40	2000	0,91	0,89	2	7,0	2
24	220	55	2000	0,91	0,89	2	7,0	2
25	220	75	3000	0,92	0,9	2	7,0	1
26	220	0,8	890	0,78	0,86	1	5,5	3

Yechish

Uch fazali rotori kiska tutashgan asinxron motorni nominal quvvati P₂=10 kVt, nominal kuchlanishi U_n =380 V, rotorni nominal aylanish chastotasi n_n=1420 ayl/min, nominal F.I.K. η_n=0,84, nominal quvvat koeffisienti cos φ_n=0,85. Yurgizish tokini karraligi I_yur/I_n=6,5, o‘ta yuklantirish koeffisienti λ=1,8. Quyidagilar xisoblansin: 1) motorni istemol quvvati; 2) Nominal va kritik moment; 3) Yurgizish toki; 4) nominal va kritik sirpanish.

Yechish. Iste’mol kilinadigan quvvat

Nominal va maksimal momentlar:

Nominal va yurgizish toklari:

Nominal va kritik sirpanish: