Polyphase Medium Induction Motors NEMA Horsepower and Speed Ratings

Electric Motors Design and Engineering

* Horsepower and Speed Ratings, Polyphase Medium Induction Motors

Polyphase Motors Voltages
1. 60 hertz—115*, 200, 230, 460, 575, 2300, 4000, 4600, and 6600 volts
2. Three phase, 50 hertz - 220 and 380 volts

NOTE—It is not practical to build motors of all horsepower ratings for all of the standard voltages.
*Applies only to motors rated 15 horsepower and smaller.

60-Hertz Induction Motors
50-Hertz Induction Motors
Hp
Synchronous Rpm
Synchronous Rpm
1/2
...
...
...
900
720
600
514
...
...
...
750
3/4
...
...
1200
900
720
600
514
...
...
1000
750
1
...
1800
1200
900
720
600
514
...
1500
1000
750
1-1/2
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
2
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
3
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
5
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
7-1/2
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
10
3600*
1800
1200
900
720
600
514
3000
1500
1000
750
15
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
20
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
25
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
30
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
40
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
50
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
60
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
75
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
100
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
125
3600**
1800
1200
900
720
600
514
3000
1500
1000
750
150
3600**
1800
1200
900
720
600
...
3000
1500
1000
750
200
3600**
1800
1200
900
720
..
...
3000
1500
1000
750
250
3600**
1800
1200
900
...
...
..
3000
1500
1000
750
300
3600**
1800
1200
...
...
...
...
3000
1500
1000
...
350
3600**
1800
1200
...
...
...
...
3000
1500
1000
...
400
3600**
1800
...
...
...
...
...
3000
1500
...
...
450
3600**
1800
...
...
...
...
...
3000
1500
...
...
500
3600**
1800
...
...
...
...
...
3000
1500
...
...

**Applies to squirrel-cage motors only.

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