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26th Oct 2021, 07:04 PM #1Member
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Single phase to three phase motor replacement - Motor Size?
Gentlemen:- Regarding replacement of an existing single-phase electric motor with a VFD & three-phase unit, I recall reading on this forum that it may be a good idea to go up one size on the new motor; can any of the resident electrical gurus comment on the why & wherefore of this, please?
I'm considering changing the standard 2hp/1.5Kw drive motor on my AL-300 lathe in this way; thus possibly going up to a 2.2Kw rating on the 3 ph. replacement.
Regards,
Halifax
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26th Oct 2021, 07:17 PM #2Member: Blue and white apron brigade
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In this thread you will see a PDF "VFDs for Newbies" - read this for a detailed explanation - saves me reinventing the wheel.
https://www.woodworkforums.com/f271/vfds-newbies-232742
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26th Oct 2021, 08:31 PM #3Most Valued Member
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I might well be wrong, but part of the answer will possibly relate to the reasons why you want to replace the single phase with 3 phase and a VFD. I'm guessing that if speed control is the reason or at least part of the reason for the change, then a larger motor could only be a good thing provided it fitted the given hole.
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29th Oct 2021, 08:32 AM #4Most Valued Member
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going up in hp/kw capacity may also result in motor frame size difference...meaning a new mount and pulley maybe required.
if you do go 3ph make sure the the VFD is suitable..ie is the motor going to be 3ph star or 3ph 240v delta. The VFD will need to match.
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29th Oct 2021, 09:14 AM #5Member
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Brand new motors can generally can be wired either star or delta, however you will need to check this before purchase.
Looking at my 4 pole motor chart, it is very likely you will go up a frame and shaft size. If so, you will need a larger pulley bore.
regards,
paul
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8th Nov 2021, 07:54 AM #6Golden Member
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12th Nov 2021, 07:01 PM #7Member
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Thank you gentlemen for all the replies.
H614
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