Hi,
Yes, this can be complicated if and when we wish to comply with all of the guidelines.
The problem in the early days included insulation breakdown, ionization, vibrating windings, etc... The industry addressed these issues and made a few other tweaks and label many motors as "inverter duty." You can buy these "retail" ($ OUCH) or on eBay if one looks for a bit. In any case, watch out for the s/h charges.
A relatively new motor from a known brand (read this as NOT "junk") will likely do you well, especially, as noted by a others here, we don't run these things as one in industry might.
As also noted earlier, check your local junk yard - you may be surprised what is brought in as scrap and the price is often great.
Speaking of noise - as noted by a group member, one might be able to change the drive frequency. We had an installation where the room was ceramic tile and stainless steel (biotech lab) - the high-pitch squeal was horrendous. The solution was to put a reactor between the motor and the VFD. A cheaper solution would be to change the VFD, but there a contract restriction. Again, not likely an issue here.
Kind regards,
DBN
--- On Sat, 9/11/10, cwswan <cwswan@wildroseinternet.ca> wrote:
From: cwswan <cwswan@wildroseinternet.ca>
Subject: [gingery_machines] Re: Repowering lathe
To: gingery_machines@yahoogroups.com
Date: Saturday, September 11, 2010, 2:15 AM
Thanks guys for the info. You have convinced me that a VFD and a
3-phase 240 0r 440 volt motor is my best option. I am considering the
Hitachi X200-022NFU1 and a 3phase 3hp 240 volt motor. How do I tell if
a motor is suitable for use with an inverter? The Hitachi manual
indicates an induction motor with an insulation ration of 800Volts is
needed. On a used motor would this info be on the nameplate? I am also
a bit intimidated by the idea of wiring this up even though the
instruction manual looks fairly straight forward. Past experience tells
me that sometimes things become more complicated and myself more
uncertain when faced with real wires. I hope you guys don't mind a bunch
more questions. I also hope I'm not offending anyone by this off topic
exchange. If so I'll drop it. Thanks again.
[Non-text portions of this message have been removed]
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