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Joined: Nov 2015
Posts: 21,456
Freak of Nature
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Freak of Nature
Joined: Nov 2015
Posts: 21,456 |
I have a question. I have (3) 3 phase motors. All rated at 2hp. 1750 RPM. Frame size are all very close to the same. They are as follows
Enco/Import - 15/16
GE motor (old) - 7/8
Baldor 5/8
My question, are these motor really the same? I would think the larger the shaft the "better" the motor.
Last edited by jmudler; 12/12/23 02:48 PM.
Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.
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Joined: Dec 2013
Posts: 28,325 Likes: 565
a.k.a. Dingle Johnson
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a.k.a. Dingle Johnson
Joined: Dec 2013
Posts: 28,325 Likes: 565 |
i would think that if the shaft size (and shaft material) were sufficient for the torsion applied by the torque of the motor with a safety factor, then anything over that size would be unnecessary weight.
"When I say ever thing I mean ever thing." - Frankie
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Joined: Dec 2009
Posts: 9,375
14 point
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14 point
Joined: Dec 2009
Posts: 9,375 |
It based on duty cycle and use. Think 3hp fan vs 3hp saw. Much different duty cycle…
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Joined: Nov 2013
Posts: 11,315 Likes: 13
Booner
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Booner
Joined: Nov 2013
Posts: 11,315 Likes: 13 |
if a pulley/sheave is going on the shaft. It doesn't really make any difference. Just make sure you can accommodate for the different FLA especially if the motor starter requires heaters (the circuit protection kind)
Last edited by goodman_hunter; 12/12/23 01:44 PM.
How you do anything is how you do everything
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Joined: Nov 2011
Posts: 5,794 Likes: 38
12 point
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12 point
Joined: Nov 2011
Posts: 5,794 Likes: 38 |
I kind of question the baldor shaft being 3/8” for 2 hp are you sure it ain’t .2
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Joined: Nov 2015
Posts: 21,456
Freak of Nature
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Freak of Nature
Joined: Nov 2015
Posts: 21,456 |
I kind of question the baldor shaft being 3/8” for 2 hp are you sure it ain’t .2 I screwed up. Its 5/8
Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.
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Joined: Nov 2011
Posts: 5,794 Likes: 38
12 point
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12 point
Joined: Nov 2011
Posts: 5,794 Likes: 38 |
yeah shaft sizes do vary as well as frames. some of the foreign motors exaggerate their horsepower greatly and they are usually the ones with the small shafts. they do sell sleeves or different size taper locks to match a different shaft to a pulley.
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Joined: Nov 2013
Posts: 11,315 Likes: 13
Booner
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Booner
Joined: Nov 2013
Posts: 11,315 Likes: 13 |
How you do anything is how you do everything
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Joined: Nov 2015
Posts: 21,456
Freak of Nature
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Freak of Nature
Joined: Nov 2015
Posts: 21,456 |
yeah shaft sizes do vary as well as frames. some of the foreign motors exaggerate their horsepower greatly and they are usually the ones with the small shafts. they do sell sleeves or different size taper locks to match a different shaft to a pulley. They do sell sleeves. I have several metal lathes and can spin one up easy enough.
Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.
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Joined: Nov 2015
Posts: 21,456
Freak of Nature
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Freak of Nature
Joined: Nov 2015
Posts: 21,456 |
Funny it is the lightest by 10 pounds or so. The other two motors are ~40 pounds.
Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.
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Joined: Jul 2011
Posts: 39,938 Likes: 130
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 39,938 Likes: 130 |
The shafts seem like a large diameter for such low HP. We had a lot of Baldor 3phase motors where I used to work . I like Baldor also. I've cut key seats, cut sleeves and couplings, broached pullys and couplings for a bunch of em.
"Why do you ask"?
Too many people spend money they don't have , on things they don't need, to impress people they don't know.
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Joined: Dec 2009
Posts: 9,375
14 point
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14 point
Joined: Dec 2009
Posts: 9,375 |
US Motor makes a great product. We rep them and they keep a huge stock in Memphis.
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