Large induction Motor Circuit Designer Page


Notes:


CHART OF LOAD MAXIMUM INERTIA (LB-FT) OF VARIOUS MOTOR SIZES
HP \ RPM 3600 1800 1200 900 720 600 514 450 400 360 327 300
0.5 1 3 8 16 27 42 61 84 112 144 182 223
1 1 6 15 31 53 82 118 163 216 278 350 431
2 2 11 30 59 102 158 228 314 417 537 677 832
3 4 17 44 87 149 231 335 462 613 789 994 1223
5 6 27 71 142 242 375 544 749 994 1281 1614 1985
7.5 8 39 104 208 355 551 799 1100 1460 1881 2370 2915
10 11 51 137 273 467 723 1049 1445 1917 2470 3112 3828
15 16 75 200 400 684 1061 1540 2120 2814 3626 4568 5620
20 21 99 262 525 898 1393 2021 2783 3694 4760 5997 7378
25 26 122 324 647 1108 1719 2495 3436 4561 5877 7406 9112
30 30 144 384 769 1316 2041 2963 4081 5418 6982 8799 10826
40 40 189 503 1007 1725 2677 3886 5353 7108 9160 11545 14206
50 49 232 620 1241 2127 3302 4794 6605 8772 11306 14251 17536
60 58 275 735 1473 2524 3919 5691 7841 10415 13425 16923 20826
75 71 338 904 1814 3111 4831 7017 9671 12848 16562 20880 25699
100 92 441 1181 2372 4070 6324 9190 12669 16833 21704 27368 33688
125 113 542 1452 2919 5011 7790 11323 15613 20751 26760 33748 41546
150 133 640 1718 3456 5937 9233 13425 18516 24612 31745 40040 49298
200 172 831 2238 4508 7752 12064 17550 24216 32200 41544 52412 64545
250 210 1017 2744 5535 9526 14834 21590 29802 39641 51157 64554 79513
300 246 1197 3239 6541 11266 17554 25561 35295 46961 60618 76508 94253
350 281 1373 3723 7528 12977 20231 29471 40708 54177 69948 88302 108799
400 315 1546 4199 8499 14662 22870 33329 46050 61303 79165 99955 123175
450 349 1714 4666 9456 16324 25474 37139 51330 68347 88280 111482 137400
500 381 1880 5126 10400 17965 28048 40906 56552 75318 97302 122895 151488
600 443 2202 6027 12250 21188 33111 48323 66842 89061 115098 145418 179297
700 503 2514 6903 14057 24344 38075 55602 76949 102570 132602 167580 206673
800 560 2815 7757 15826 27438 42949 62759 86895 115872 149846 189425 233668
900 615 3108 8592 17559 30477 47743 69805 96694 128987 166857 210984 260319
1000 668 3393 9409 19261 33465 52463 76749 106360 141931 183656 232283 286659
1250 790 4073 11379 23386 40735 63975 93714 130004 173627 224823 284518 351294
1500 902 4712 13257 27349 47753 75120 110178 152990 204485 264951 335484 414412
1750 1004 5313 15055 31170 54548 85945 126203 175402 234613 304172 385344 476208
2000 1096 5881 16778 34861 61142 96482 141835 197300 264088 342584 434218 536827
2250 1180 6418 18435 38434 67552 106754 157108 218728 292968 380259 482197 596380
2500 1256 6927 20028 41898 73793 116784 172050 239725 321301 417258 529355 654952
3000 1387 7864 23042 48523 85808 136175 201028 280539 376475 489410 621430 769431
3500 1491 8704 25846 54782 97258 154759 228912 319930 429849 559342 710812 880708
4000 1570 9455 28457 60708 108196 172613 255807 358036 481602 627276 797774 989110
4500 1627 10124 30892 66327 118663 189797 281796 394965 531871 693383 882526 1094887
5000 1662 10717 33163 71661 128692 206358 306944 430805 580768 757801 965235 1198241
5500 1677 11237 35278 76728 138310 222336 331305 465626 628383 820643 1046040 1299336
6000 1673 11689 37246 81541 147542 237764 354925 499488 674791 882003 1125055 1398312
7000 1612 12400 40772 90459 164920 267082 400095 564535 764243 1000590 1278098 1590358
8000 1484 12873 43786 98498 180956 294501 442709 626280 849549 1114091 1425008 1775146
9000 1294 13123 46328 105725 195754 320168 482968 684985 931041 1222917 1566284 1953274
10000 1046 13166 48427 112193 209395 344200 521033 740861 1008986 1327399 1702330 2125219
11000 743 13012 50110 117947 221949 366698 557039 794084 1083607 1427810 1833478 2291380
12000 387 12673 51398 123024 233474 387744 591099 844801 1155090 1524383 1960007 2452088
13000 -18 12156 52309 127458 244021 407412 623311 893139 1223596 1617313 2082157 2607628
14000 -471 11470 52860 131276 253634 425762 653759 939207 1289263 1706773 2200138 2758249
15000 -970 10620 53066 134505 262351 442851 682518 983104 1352214 1792914 2314130 2904168




Notes:
#1. Motor Data based on 60Hz, Squirrel Cage Motors.
#2. Values are theoretical values based in information in NEMA MG1 Part 20.
#3. Values are for educational purposes only. It is user's sole responsibility to ensure actual motor circuit design conforms to all applicable national and local codes. These values are for educational purposes only. Due to the wide range of motor circuit applications, the author assumes no responsibility for the application of these values.

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