Induction motor frame 1

[PAP]

Dear sir
Anyone can help me about the standards of the frame of motor.
Thank you.

 

[electricpete]

NEMA frame assignments are described in MG1. Condensed version is available for free at:

http://www.nema.org/index_nema.cfm/1427/8672E77E-D3BC-494F-A0D0CE6E55B99A74/

 

[electricpete]

fractional horsepower motors use 2-digit frame designations, integral use 3-digit frames.
First 2 digits always shaft height in inches times 16 (small machines) or times 4 (larger machines).

For example, frame 48 has 3” shaft height.

445 has shaft height of 11”.

The 5 at the end of 445 can be used to determine length by table lookup. Many more dimensions are defined which help to ensure mechanical interchangeability of motors.

 

[SteveKW]

Here is a handy link...

http://www.leeson.com/literature/bulletins/pdf/1050/Dimensions.pdf