Standard Electric Motor Sizes Hp

3 phase induction motors of 1000v or lower.

Standard electric motor sizes hp.

803 324 3259 standard nema frames vs. Electric motors generators and drives the following are dimensional size charts for standard electric motor nema standard frames and configuration. Note that most electric motors are designed to run at 50 to 100 of rated load and that maximum efficiency usually is near 75 of rated load. 1 1 5 2 3 5 7 5 10 15 20 25 30 40 50 60 75 100 125 150 200 250 300 350 400 450 500 600 700 800 900 1000 1250 1500 1750 2000 2250 2500 3000 3500 4000 nominal voltage of not more than 600 v ac and nominal frequency 50 or 60 hz.

800 868 3770 fax. Standardized motor dimensions are established by the national electrical manufacturers association nema are tabulated below and apply to all base mounted motors listed herein that carry a nema. Standard motor catalogue aesv2e aesu2e series. Horsepower 900 rpm 1200 rpm 1800 rpm 3600 rpm hp t frames 1964 present u frame 1952 present original nema t frames 1964 present u frame 1952 present original nema t frames.

For a 1 horsepower hp motor the load should typically be in the range 1 2 to 1 hp with maximum efficiency at 3 4 hp. Frame size 2 pole 4 pole 6 pole 100 5200 3600 2400 112 5200 3600 2400. Teco westinghouse motor company teco electric europe ltd middle east atlas diba engineering trade co. Standard horsepower ratings for electrical motors 1 to 4000 hp are indicated below.

Motor hp voltage typical motor f l a. However choosing the next larger size motor say 10 instead of 7 5 hp brings greater capacity for coping with. Motors of higher speed usually take a lower current than that shown in the table. A motor sized for peak load alone may burn out rapidly in intermittent duty.

Copper conductor 75 c rating. The high output motors are best suited for applications requiring a high power to size ratio and extend from frame size 90 to 315 or 1 1 to 350 kw with a minimum efficiency level of ie2. The wire breaker and fuse sizes are provided as a reference for the installer and are based on the 1996 national electrical code.