Synchronous and Approximate Full Load Speed of Standard A.C. Induction Motors
|
NUMBER OF POLES |
60 CYCLE RPM |
50 CYCLE RPM |
|
SYNC. |
F.L. |
SYNC. |
F.L. |
|
2 |
3600 |
3500 |
3000 |
2900 |
|
4 |
1800 |
1770 |
1500 |
1450 |
|
6 |
1200 |
1170 |
1000 |
960 |
|
8 |
900 |
870 |
750 |
720 |
|
10 |
720 |
690 |
600 |
575 |
|
12 |
600 |
575 |
500 |
480 |
|
14 |
515 |
490 |
429 |
410 |
|
16 |
450 |
430 |
375 |
360 |
|
18 |
400 |
380 |
333 |
319 |
|
20 |
360 |
340 |
300 |
285 |
|
22 |
327 |
310 |
273 |
260 |
|
24 |
300 |
285 |
240 |
230 |
|
26 |
277 |
265 |
231 |
222 |
|
28 |
257 |
245 |
214 |
205 |
|
30 |
240 |
230 |
200 |
192 |
Full Load Amperes at Motor Terminals * Average Values for All Speeds and Frequencies
|
MOTOR HP |
SINGLE-PHASE A-C |
THREE-PHASE A-C INDUCTION TYPE SQUIRREL CAGE & WOUND ROTOR |
DIRECT CURRENT |
|
115 VOLTS |
230 VOLTS |
230 VOLTS |
460 VOLTS |
575 VOLTS |
120 VOLTS |
240 VOLTS |
|
1/2 |
9.8 |
4.9 |
2.0 |
1.0 |
.8 |
5.2 |
2.6 |
|
3/4 |
13.8 |
6.9 |
2.8 |
1.4 |
1.1 |
7.4 |
3.7 |
|
1 |
16 |
8 |
3.6 |
1.8 |
1.4 |
9.4 |
4.7 |
|
1 1/2 |
20 |
10 |
5.2 |
2.6 |
2.1 |
13.2 |
6.6 |
|
2 |
24 |
12 |
6.8 |
3.4 |
2.7 |
17 |
8.5 |
|
3 |
34 |
17 |
9.6 |
4.8 |
3.9 |
25 |
12.2 |
|
5 |
56 |
28 |
15.2 |
7.6 |
6.1 |
40 |
20 |
|
7 1/2 |
80 |
40 |
22 |
11 |
9 |
58 |
29 |
|
10 |
100 |
50 |
28 |
14 |
11 |
76 |
38 |
|
15 |
|
|
42 |
21 |
17 |
112 |
55 |
|
20 |
|
|
54 |
27 |
22 |
148 |
72 |
|
25 |
|
|
68 |
34 |
27 |
184 |
89 |
|
30 |
|
|
80 |
40 |
32 |
220 |
106 |
|
40 |
|
|
104 |
52 |
41 |
292 |
140 |
|
50 |
|
|
130 |
65 |
52 |
360 |
173 |
|
60 |
|
|
154 |
77 |
62 |
430 |
206 |
|
75 |
|
|
192 |
96 |
77 |
536 |
255 |
|
100 |
|
|
240 |
120 |
96 |
|
350 |
|
125 |
|
|
296 |
148 |
118 |
|
440 |
|
150 |
|
|
350 |
175 |
140 |
|
530 |
|
200 |
|
|
145 |
228 |
182 |
|
710 |
|
250 |
|
|
558 |
279 |
223 |
|
|
* These values for full load current running at speeds usual for belted motors and motors
with normal torque characteristics. Motors built for especially low speeds or high torques may
require more running current, in which case the nameplate current rating should be used.
** For full load currents of 208 and 200 volt motors, increase the corresponding 230 volt
motor full load current by 10 and 15 per cent respectively.
|
