25 Jul
2018
25 Jul
'18
6:54 a.m.
On Jul 25, 2018, at 9:50 AM, GerardCJAT via cctech
<cctech at classiccmp.org> wrote:
Why don't you simply power it through an inverter that will output 60 Hz, eventually
even "down to" 120 V , true sine wave, of course ??? They are not that expensive
by now.
I wouldn't worry about "true sine wave". That seems more of a marketing
thing anyway, and motors don't care. Just feed them with a variable frequency motor
drive and all should be well.
And be carefull : motor designed for 60 Hz, running
"under" 50 Hz, OR THE OPPOSITE, I do not recall !!!, display a significant
reduced life time.
I have to check which is which, but I know this is a question of saturated magnetic
field. Better check first.
That doesn't sound right. If you run the frequency up high enough you might get into
problems with magnetic materials not designed for it. And much lower probably gives you
reduced torque. But 50 vs. 60 Hz is a trivial difference for a motor, I can't see any
reasons for that to cause trouble. I routinely run my lathe at half frequency if not
less, and it doesn't complain.
paul