3 Calculation and construction of static characteristics of thyristor drive

3.1 Initial data

In the figure 3.1 power part of the principal scheme is given reversing thyristor drive, for which separate control over thyristor groups was taken.

Figure 3.1 is the force part of principal scheme of reversing thyristor drive.

We know that separate control over thyristor groups allows us to exclude reactors, limiting the compensative currents, from the scheme and with such a way making system easier and decreasing its cost. But in such a case rectified current becomes intermittent at small loads. For the given in Table 3.1 variants of system ТП - Д it’s offered to calculate the static characteristics of electric drive at all possible speed range of motor rotation, meaning two-zone regulation: by the voltage at the motor armature in the speed range down from the basis and excitation flow in the range of speed up from the basis.

Comments:

1. In variants 1 - 10, 26 - 35 we use: thyristor complete assembly ТЭР9-25/23СТ-31У4 for rectified voltage 230V and current strength 25 А with transformer ТСП-10/0,7 (ТСЕП-10/0,7) for voltage U₁=380 V U_2Л=205 V and winding connection Y-Y.

2. In variants 11 - 20, 36- 45 we use: thyristor complete assembly ТЭР9-50/230Т-31У4 for rectified voltage 230V and current strength 50 А with transformer ТСП-16/0,7 (ТСЕП-16/0,7) for voltage U₁=380 V; U_2Л=205 V and winding connection Y-Y.

3. In variants 21 - 25, 46 - 50 we use: thyristor complete assembly ТЭР9-100/230Т-31У4 for rectified voltage 230V and current strength 100 A with transformer ТСП-25/0,7 (ТСЕП-25/0,7) for voltage U₁=380 V; U_2Л=205 V and winding connection Y-Y.

3.2 The task

3.2.1 To realize calculations and construct electromechanical characteristic of the drive, which works in the zone of intermittent currents  at voltage changing at the motor armature in the range ± U_ном (Fig. 3.2)

Figure 3.2 – Electromechanical characteristics of the drive.

Table 3.1 Catalogue data of electric motors	Rotor moment of inertia J, kgm^2		0,047	0,037	0,011	0,084	0,012	0,038	0,048	0,104	0,014	0,046	0,037	0,038	0,037	0,046	0,084
	Resistance at 15°С, Оhm	add. poles	0,915	1,26	0,57	0,72	0,51	0,486	0,43	0,526	0,682	0,915	0,692	0,224	0,308	0,445	0,407
		armature	1,08	1,693	0,805	0,99	0,52	0,74	0,59	0,609	0,788	1,08	0,906	0,346	0,472	0,67	0,516
	Maximal Рзбудж, Wt		158	290	130	191	124	169	191	188	236	411	290	169	341	482	690
	efficiency,%		76,5	67	79	76,5	81	77	80	79,5	76	67	74	51	80,5	73	73
	Rotational frequency n, об/хв.	Max	3000	2500	4000	2500	4000	4000	3000	2500	4000	2500	3000	4000	4000	3000	2500
		Nominal	1060	750	3000	750	3150	1600	1000	800	220	750	1060	2360	1500	1000	750
	Nominal values	IAR, A	10,5	12,1	11	11,6	11,8	13,2	13,4	13,6	13,8	16,9	17	19,7	21,2	24	23
		UAR, V	220
		P, кWt	1,9	2	2	2,1	2,2	2,4	2,5	2,5	2,5	2,8	3	3,7	4	4,2	4,2
	Motor type		2ПБ- 132M	2ПБ- 132M	2ΠΗ- 100M	2Г1Б - 160M	2ΠΗ- 100M	2ПБ- 132M	2ПБ- 160M	2ПБ - 160M	2ΠΗ- 112M	2ПБ- 132M	2ПБ- 132M	2ПБ- 132M	2ΠΦ- 132M	2ΠΦ- 132M	2ΠΦ- 160M
	Variant		1	2	3	4	5	6	7	8	9	10	11	12	13	14	15

Extension of the table 3.1	Rotor moment of inertia J, kgm^2		0,038	0,046	0,104	0,037	0,084	0,084	0,037	0,046	0,084	0,104	0,104	0,2	0,23	0,103	0,46
	Resistance at 15°С, Оhm	add. poles	0,148	0,22	0,227	0,166	0,208	0,056	0,094	0,124	0,101	0,175	0,031	0,206	0,145	0,073	0,066
		armature	0,185	0,269	0,328	0,226	0,326	0,081	0,14	0,167	0,145	0,216	0,044	0,286	0,203	0,096	0,08
	Maximal Рзбудж, Wt		169	483	730	341	448	170	341	482	960	730	188	900	786	730	482
	eficiency,%		81,5	80,5	77,5	83	79	86,5	85	83,5	83	80	86,5	76,5	79	84,5	86
	Rotational frequency n, об/хв	Max	4000	4000	2500	4000	3000	4000	4000	4000	4000	3000	4000	2500	2500	4000	4000
		Nominal	3150	1600	800	2360	1000	3000	3000	2120	1500	1000	3350	750	750	1500	3000
	Nominal values	IAR, A	24,2	29,4	29,6	31,2	32,9	36,5	38,5	39,4	38	42	41,7	50	55	56	57
		UAR, V	220
		P, кWt	4,5	5,5	5,6	6	6	7,1	7,5	7,5	7,5	8	8,1	9	10	11	11
	Motor type		2ПБ- 132M	2ΠΦ- 132M	2ΠΦ- 160M	2ΠΦ- 132M	2ΠΦ- 160M	2ΠΦ- 160M	2ΠΦ- 132M	2ΠΦ- 132M	2ΠΦ - 160M	2ΠΦ- 160M	2ПБ- 132M	2ΠΦ- 180M	2ΠΦ- 180M	2ΠΦ- 160M	2ΠΦ- i32M
	Variant		16	17	18	19	20	21	22	23	24	25	26	27	28	29	30

3.2.2 To realize calculations and construct electromechanical characteristics of drive at voltage changing at the motor armature in the range ±U_ном and loading current from zero to the nominal value (Fig. 3.3)

Figure 3.3 – Electromechanical characteristics.

3.2.3 To realize calculations and construct mechanical characteristics of electric drive for engine regime at two-zone regulation of angular velocity and at changing of loading current from zero to the nominal value (Fig. 3.4).

Figure 3.4 – Mechanical characteristics of electric drive.

3.2.4 To designate:

- zones of intermittent currents at all graphs;

- zone of admissible continuous moments of the motor at all range of angular velocities in the graphs of mechanical characteristics (Fig. 3.4).