cooling tower structre /motor change

[amper]

we have a colling tower GEA settle with an aluminiun motor 140kgms frame ,size 200 rmp690 . we need to reeplace them but this day aluminiun motor on this size are not available , our option is cast iron which is slitly more than double on weigh . can somebody with knowledge make coomets pn what i need to take on consideration to avoid vibration or other problems due to the overweight ?

regards

amper

 

[drawoh]

amper,

Is this an electric motor? Regardless, what is the power and torque of the motor?

Why does aluminium versus cast iron matter? The 140kg aluminium motor is not one or even two man portable.

Do you have a mechanical engineer on staff? This sounds like his department.

JHG

 

[amper]

is a electric motor 690rpm ,35amp. 440v 60hz 139kgm the old units

new unit will be 270kgr 690rpm 33 amp

i want to know what we need to see or considerate on the extructute to avoid problems of vibrations is the extructure need a reenforcement.

regards

 

[MintJulep]

We'll guess that the rotating parts of the motor are essentially unchanged, and that it's the stator that is changing from aluminum to cast iron. If that's actually the case your vibrations will probably go down. Same exciting force, more to excite.

As for structure, figure out the load paths and stresses.

Basically, it will be a linear problem. Double the load, double the stress.

 

[ScottyUK]

Good assumption MintJulep - it's the outer casing which is different: the active parts of the motor - i.e. the stator core, stator indings, and the rotor are all very similar.


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