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Induction Motors - No. of Poles and Synchronous vs. Full Load Speed

Synchronous and full load speed of amplitude current (AC) induction motors.

Synchronous and approximate full load speed of AC synchronous electrical induction motors:

Induction Motors - No. of Poles and Synchronous vs. Full Load Speed
Number of PolesSpeed (rpm)
Frequency (Hz, cycles/sec)
6050
SynchronousFull LoadSynchronousFull Load
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

Example - Speed of Electric Motor

A motor with 4 poles runs with frequency 50 Hz. The synchronous speed is 1500 rpm and the typical full load speed is 1450 rpm. The slip is the difference between synchronous and load speed - 50 rpm.

Electric motors - Synchronous speed vs. frequency and no. poles

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