Motor frame size
Motor frame size
(OP)
For a given driven equipment ( Pump) , with the known GD2 value and torque requirement , how the frame size of the drive equipment ( motor) is selected? What are all the factors to be considered. In one of the Project , the client had changed the make of the motor from one vendor to another. Should there be any change in the Frame size? Is this applicable for both the LT and HT motors? Thanks to clarify.





RE: Motor frame size
The following factors will affect frame sze;
HP
Speed
Cooling method (TEFC, ODP)
T-frame, U-frame, or, for very old installed equipment, NEMA-frame.
A multi-speed motor may be a different frame than the same HP motor in single speed.
Check the manufacturers specs to determine the frame size for the motor you require. If different manufacturers offer the same motor configuration in different frame sizes, consider designing for the larger frame. It is fairly easy to shim a smaller replacement motor, but difficult to install a larger motor.
Bill
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"Why not the best?"
Jimmy Carter
RE: Motor frame size
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Eng-tips forums: The best place on the web for engineering discussions.
RE: Motor frame size
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Motor frame size
What I know is that from the NEMA motor frame size, I get to know the shaft diameter (through the bearing size), mounting frame bolt center distances, etc. If you have a pump shaft, you measure the diameter and try to refer to the frame chart which motor frame has the same OD as your pump shaft.
I guess you could decide what type of material to be used as a shaft key based on your torque requirements inertia load. Other than those, let's wait for others to comment.
Hope this helps.
RE: Motor frame size
RE: Motor frame size