NEMA Frame Assignments - 3-Phase Induction Motors

FLUID POWER - Design Data Sheet 66

The most widely used type of electric motor for driving a hydraulic pump is the 3-phase, squirrel cage induction motor, with Design B electrical characteristics. It is available in open drip-proof, totally enclosed, and explosion proof frames. Information in this issue is concerned with frame assignments and with the dimensions of shaft length, diameter, and height above base, which have to do with selection of a pump coupling, and with the height of a pump mounting bracket. Please refer to Design Data Sheets 3, 33, and 49 for other information on electric motors.

The shaft dimensions are in inches. They are listed with the open drip-proof motors, but apply also to the totally enclosed motors which have the same NEMA frame assignments.

Open Drip-Proof Frame Electric Motors   Totally Enclosed Motors
HP Speed,
RPM
NEMA
Frame
Shaft
Diameter
Shaft
Length 
Shaft
Height
HP Speed,
RPM
NEMA
Frame
1 1200 145T 7/8 2-1/4 3-1/2 1 1200 145T
1 1800 143T 7/8 2-1/4 3-1/2 1 1800 143T
1-1/2  1200 182T 1-1/8 2-3/4 4-1/2 1-1/2 1200 182T
1-1/2 1800 145T 7/8 2-1/4 3-1/2 1-1/2 1800 145T
1-1/2 3600 143T 7/8 2-1/4 3-1/2 1-1/2 3600 143T
2 1200 184T 1-1/8 2-3/4 4-1/2 2 1200 184T
2 1800 145T 7/8  2-1/4 3-1/2 2 1800 145T
2 3600 145T 7/8 2-1/4 3-1/2 2 3600 145T
3 1200 213T 1-3/8 3-3/8 5-1/4 3 1200 213T
3 1800 182T 1-1/8 2-3/4 4-1/2 3 1800 182T
3 3600 145T 7/8 2-1/4 3-1/2 3 3600 182T
5 1200 215T 1-3/8 3-3/8 5-1/4 5 1200 215T
5 1800 184T 1-1/8 2-3/4 4-1/2 5 1800 184T
5 3600 182T 1-1/8 2-3/4 4-1/2 5 3600 184T
7-1/2 1200 254T 1-5/8 4 6-1/4 7-1/2 1200 254T
7-1/2 1800 213T 1-3/8 3-3/8 5-1/4 7-1/2 1800 213T
7-1/2 3600 184T 1-1/8 2-3/4 4-1/2 7-1/2 3600  213T
10 1200 256T 1-5/8 4 6-1/4 10 1200 256T
10 1800 215T 1-3/8 3-3/8 5-1/4 10 1800 215T
10 3600 213T 1-3/8 3-3/8 5-1/4 10 3600 215T
15 1200 284T 1-7/8 4-5/8 7 15 1200 284T
15 1800 254T 1-5/8 4 6-1/4 15 1800 254T
15 3600 215T 1-3/8 3-3/8 5-1/4  15 3600 254T
20 1200 286T 1-7/8 4-5/8 7 20 1200 286T
20 1800 256T 1-5/8 4 6-1/4 20 1800 256T
20 3600 254T 1-5/8 4 6-1/4 20 3600 256T
25 1200 324T 2-1/8 5-1/4 8 25 1200 324T
25 1800 284T 1-7/8 4-5/8 7 25 1800 284T
25 3600 256T 1-5/8 4 6-1/4 25 3600 284TS
30 1200 326T 2-1/8 5-1/4 8 30 1200 326T
30 1800 286T 1-7/8 4-5/8 7 30 1800 286T
30 3600 284TS 1-5/8 3-1/4 7 30 3600 286TS
40 1200 364T 2-3/8 5-7/8 9 40 1200 364T
40 1800 324T 2-1/8 5-1/4 8 40 1800 324T
40 3600 286TS 1-5/8 3-1/4 7 40 3600 324TS
50 1200 365T 2-3/8 5-7/8 9 50 1200 365T
50 1800 326T 2-1/8 5-1/4 8 50 1800 326T
50 3600 324TS 1-7/8 3-3/4 8 50 3600 326TS
60 1200 404T 2-7/8 7-1/4 10 60 1200 404T
60 1800 364TS 1-7/8 3-3/4 9 60 1800 364TS
60 3600 326TS 1-7/8 3-3/4 8 60 3600 364TS
75 1200 405T 2-7/8 7-1/4 10 75 1200 405T
75 1800 365TS 1-7/8 3-3/4 9 75 1800 365TS
75 3600 364TS 1-7/8 3-3/4 9 75 3600 365TS
100 1200 444T 3-3/8 8-1/2 11 100 1200 444T
100 1800 404TS 2-1/8 4-1/4 10 100 1800 405TS
100 3600 365TS 1-7/8 3-3/4 9 100 3600 405TS
125 1200 445T 3-3/8 8-1/2 11 125 1200 445T
125 1800 405TS 2-1/8 4-1/4 10 125 1800 444TS
125 3600 404TS 2-1/8 4-1/4 10 125 3600 444TS
150 1800 444TS 2-3/8 4-3/4 11 150 1800 445TS
150 3600 405TS 2-1/8 4-1/4 10 150 3600 445TS
200 1200 445TS 2-3/8 4-3/4 11  - - - -  - - - -  - - - -
200 1800 444TS 2-3/8 4-3/4 11  - - - -  - - - -  - - - -
200 3600 445TS 2-3/8 4-3/4 11  - - - -  - - - -  - - - -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POLYCARBONATE (PLASTIC) BOWLS FOR AIR LINE FILTERS & LUBRICATOR

Polycarbonate (plastic) bowls used on air line filters and lubricators represent a major safety hazard if not properly operated and maintained. We recommend that plastic bowls be protected with a bowl guard to confine fragments in case of bowl failure.

All plastic bowls on equipment you manufacture for resale (OEM) should be protected to avoid liability lawsuits in case of accident.

All manufacturers of this type of equipment obtain their raw plastic from one of two sources - General Electric Co., or Mobay Chemical Co. The plastic has been developed over many years to be the safest that it has been possible to produce, but no plastic is completely impervious to the action of chemicals, heat, and high pressure. This sheet gives a summary of important characteristics of the polycarbonate plastic from which the bowls are made.

Chemical Properties
It is resistant to water, organic and inorganic acids, mineral, animal, and vegetable oils, fats, and dilute acids.

It is attacked by strongly alkaline materials such as ammonia. See partial list of materials in the table.

It is partly soluble in chlorinated hydrocarbons, ketones, esters, benzene-toluene type chemicals and other materials.

It is highly soluble in many liquids such as acetone, gasoline, lacquer thinner and other materials in the table.

It has a tensile strength of 8,000 to 9,000 PSI, and so has a high impact resistance.

Materials Harmful to Polycarbonate Bowls
This is only a short list of the many chemicals which affect polycarbonate. For information on a specific chemical, contact General Electric Co. or Mobay Chemical Co.

 

Acetic acid (conc.) Cresol Milk of Lime
Acetone Ethyl ether Nitric acid
Benzene Ethylene dichloride Nitrobenzene
Benzyl alcohol Formic acid (conc.) Phenol
Carbolic acid Freon Sodium sulfide
Carbon disulfide Gasoline Styrene
Carbon tetrachloride Hydrochloric acid Sulfuric acid
Caustic soda (5%) Methyl alcohol Toluene
Chloroform Methylene chloride Xylene

 

Cautions
Do not use a plastic bowl where it will be subject to internal or ambient external temperatures higher than 120°F, or where air pressure exceeds 200 PSIG.

Do not use near, or do not clean with such materials as acetone, alcohol, benzene, dioxane, ethyl acetate, lacquer thinners, toluene, chloride, carbon tetrachloride, alkalies, amines, ketones, esters, aromatic hydrocarbons, or any other of the items listed in the chart.

Do not allow rags or other things containing substances that may be harmful to polycarbonate to lie under, on top of, or near a polycarbonate bowl.

Never paint a polycarbonate bowl.

Do not use on air which contains vapor or mist of a synthetic fire resistant fluid, nor on an air line served by a compressor which uses this fluid as a lubricant.

Suggestions
Inspect your plant and check your purchasing department and inventory list to detect the possible presence of materials which will attack polycarbonate plastic bowls and their location for storage and/or use in your plant.

Replace all polycarbonate bowls once a year unless they are protected by a metal bowl guard.

Purchase from the supplier of your plastic bowl equipment metal guards for all exposed bowls in your plant.

On all new equipment purchased, make sure the filters and lubricators are equipped either with metal bowls or with bowl guards.

For all lubricators, use only non-detergent petroleum oil of very low viscosity, equivalent to SAE 5 or SAE 10. Do not use or add anti-freeze compounds to the lube oil.

If bowls become dirty, clean only with a clean dry cloth.

 

Download a PDF of Fluid Power Design Data Sheet 66 - NEMA Frame Assignments - 3-Phase Induction Motors

© 1990 by Womack Machine Supply Co. This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.

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