Educate me in motor swap and frame size - need a 184t

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Forum topic by PatrickIrish posted 07-21-2018 02:03 AM 908 views 0 times favorited 2 replies Add to Favorites Watch
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164 posts in 2856 days

07-21-2018 02:03 AM

So I decided to do a motor replacement to a single phase for my powermatic planer since my VFD blew up. In the long run it’s less of a headache and since I don’t have a dedicated 220 line for a VFD.

My current motor is a 184t mounting with a 1 1/8 shaft and 3450rpm. It’s about a $400 motor in a single phase model.

Can I use another framed motor as long as I get the shaft to be in line with the pulley? I read that a 5hp 184t and a 5hp 56y despite being the same hp aren’t the same in internals. Can someone verify that for me?

Also, if I find a 184t with a smaller shaft, can I just swap the pulley to match OR would that not be strong enough for a planer motor? The current 3 phase motor is a 1 1/8 shaft.

2 replies so far

View MrUnix's profile


8164 posts in 3010 days

#1 posted 07-21-2018 03:19 AM

NEMA Quick Reference Chart

Did you keep the starter that came on the machine originally? Also, not sure what you are referring to regarding not having a 240v circuit… you will need one regardless of which way you go.


-- Brad in FL - In Dog I trust... everything else is questionable

View CaptainKlutz's profile (online now)


3379 posts in 2305 days

#2 posted 07-21-2018 09:54 AM

+1 MrUnix – Nema table shows differences and can help guide frame size changes.

IMHO – Swapping different motor types into a woodworking machine can be tricky decision.
Swapping between frame types on smaller motors is much easier, than for 2HP+ TEFC woodworking motor.
Every time I have investigated cheaper alternative on 3-7HP 3PH to 1PH motor swap, i find that unless the replacement motor is free, and/or you make change over bits to fit new motor DIY/free; the total cost for installing different frame is same or more than original frame type. YMMV?

One item you should investigate: Many tools are available new with several different motors. Many times the OEM motor mount is same for 3HP or 5HP models, and/or 1HP/3HP models? This might allow similar (occasionally cheaper) frames to fit existing motor bracket. Better yet the OEM will have different OEM part number for pulley that mates to other motors. Often the 3 PH models will have a different machine PN, than 1PH; so almost need an old sales catalog from when machine was made to find model numbers with different motor configurations of interest.

Can suggest an alternate source. Occasionally you can find a LOCAL motor rebuild shop that is able sell you a new or premium brand rebuilt motor for same/less $$ as online (with shipping). Some even give you credit for old motor in trade. Trade in value may not be top dollar, but it can reduce pain in buying a new motor.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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