Electric Motor Frame Guide

For example a 56 frame motor would have a shaft height d dimension of 56 16 of an inch or 3 5 inches.

Electric motor frame guide.

For example a 254t frame would have a shaft height of 25 4 6 25 inches. The largest of the cur rent fractional horsepower frame sizes is a 56 frame that is available in horsepower greater than those normally associ ated with fractionals. 1 in inch 25 4 mm 1 inch 25 4 mm sorry to see that you are blocking ads on the engineering toolbox. 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 frame designation.

The two digits represent the shaft height of the motor from the bottom of the base in sixteenths of an inch. By nema definition two digit frame numbers are fractional frames even though 1 hp or larger motors may be built in them. For example if you have a 324t frame motor every manufacture of motor will have the same shaft diameter shaft length and bolt hole mounting dimensions but be warned your physical size of the motor may differ. Nema guidelines standardized motor dimensions established by the national electrical manufacturers association nema are tabulated below and apply to all base mounted motors listed herein that carry a nema frame 1designation.

There are other common letter suffixes that are also standard. It is that the centerline shaft height d dimension above the bottom of the base is the first two digits of the frame size divided by four. Fractional motors are generally nema 48 or 56 frame. Electric motors generators and drives the following are dimensional size charts for standard electric motor nema standard frames and configuration.

Leader in energy efficient industrial electric motors and drives key and keyseat dimensions framed g f gd frame d g f gd 63 8 51144 1804842 5 149 71 14 115 5 20055 491610 80 15 51966 2256053 18 11 90 20248 7 2506567 5 2012 10028 248 7 28075 712214 11228 248 7 31580 762214. You can figure that a 48 frame motor will have a shaft height of 48 divided by 16 or 3 inches. Electric motor frame north american standards for motors follow nema dimensional designs signified by frame sizes. It will cover in a generic way most of the subjects which you should consider when writing a specification for an electric motor.

Dimensions of electrical motor frames according nema 1984 are indicated below. Integral horepower motors also have frame numbers followed by the letter t. Additional specification material is. Nema t frame motors range from 143t through 449t.

Similarly a 56 frame motor would have a shaft height of 3 inches.