electrical motors cooling methods

[usamaegypt]

Hi;
Could some body providing me with cooling codes (IC) for electrical motors.
Regards.

 

[electricpete]

If you go to the NEMA website

http://www.nema.org

you can download free copy of condensed NEMA MG-1. Table 4 gives cooling codes designations.

TABLE 4
TYPICAL METHODS OF COOLING (IC CODE) NEMA IC Circuit Arrangement Primary Coolant Method of Movement Secondary Coolant Method of Movement
WP-I IC 0 A 1
WP-II IC 0 A 1
ODP IC 0 A 1
TEFC (guarded) IC 4 A 1 A 1
TEBC IC 4 A 1 A 6
TENV IC 4 A 1 A 0
TEAO IC 4 A 1 A 7
Complete designation — full description (3 or 5 numerals or letters {numeral letter numeral [letter numeral]}
Simplified designation — 2 or 3 numerals or letters in the final position {numeral numeral numeral or numeral numeral letter}.
Example: The COMPLETE designation of TEFC guarded would be IC4A1A1; the SIMPLIFIED designation would be IC

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[electricpete]

whoops - I clipped off the very end of the example:

Example: The COMPLETE designation of TEFC guarded would be IC4A1A1; the SIMPLIFIED designation would be IC 411.

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[usamaegypt]

Dear;
I have read this table but unfortunatly there is not a clarification for the letters numbers used.
Regards.

 

[electricpete]

Complete description is in MG-1 (2003) Section I - GENERAL STANDARDS APPLYING TO ALL MACHINES - Part 6
ROTATING ELECTRICAL MOTORS—METHODS OF COOLING (IC CODE)

It is 10 pages long so you will have to be more specific if you have a specific questino

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[mc5w]

There is also TEBC (totally enclosed blower cooled) which uses a seperately powered blower. A variation on that is pipe (duct) cooled - essentially the blower and the motor are connected by a supply duct and possibly also by a return air duct.

Blower cooling is primarily used in variable speed applications where the stock cooling fan would run too slow. Pipe cooling is used for things like a motor that in inside an otherwise poorly cooled box or where there is a dusty atmosphere in which case the supply duct completely covers the motor.

Most motor manufacturers can give you data on how many cubic feet per minute of air you need for a pipe cooling scheme and sell you blower cooling kits.

Mike Cole, mc5w@earthlink.net