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vfd with old motor

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Forum topic by Dorty posted 1054 days ago 901 views 0 times favorited 4 replies Add to Favorites Watch
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Dorty

20 posts in 1056 days


1054 days ago

Topic tags/keywords: question

Hello everyone this is my first post. I have searched and read almost all the early posts about phase converters. I am currently trying to get my 1940’s JD Wallace table saw running in my garage. This table is built very well and the previous owner said it is dead on accurate. I have been a little confused with VFD’s on some of the posts I have read. Are they something I can use with a motor this old or should I go with a rotary phase converter. Any help would be great. Thanks


4 replies so far

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crank49

3338 posts in 1573 days


#1 posted 1054 days ago

A VFD should work, but the wave form of the power coming out of a VFD might tax an older moter more than a new motor designed for VFD service. Those old motors usually had more beef to them and will probably be fine. The net result would be overheating in a fully loaded continuous operating motor. A table saw is neither fully loaded, nor continuous.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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Minorhero

196 posts in 1207 days


#2 posted 1054 days ago

There are quite a few people at the OWWM.org forum that have put VFD’s on motors of the age and older. They do not seem to have any problems. If you have any questions the folks over there can probably answer them easily in the electrical section of their forum.

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TopamaxSurvivor

14609 posts in 2278 days


#3 posted 1054 days ago

My guess would be a 50/50 chance of a VFD working with that old motor. The problem is the insulation and the high frequency switching the modern VFDs use to make the 3 phase. An older style VFD from about 20 years ago would be a better bet. I would suggest checking the motor with a high megger or megaohm meter. If it doesn’t read infinity, you will definitely be better off using a roto phase.

If you hook it up to a drive, it probably won’t hurt the motor. If it the VFD doesn’t start motor it is because it is seeing ground fault through the old insulation even though the motor will run fine on normal power.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Dorty

20 posts in 1056 days


#4 posted 1054 days ago

I think I am going to go ahead and buy A VFD. Thanks for everyone’s help

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