In article . com,
wrote:
I've got an ARU 44 gyro and I'd like to power it off my 24VDC system.
It needs 115VAC 3 phase, and about 75W to 100W. Is there an off the
shelf unit that can do this, or maybe someone knows of a schematic to
build my own? I'm an electronics engineer so I can do this, but
inverters are not my specialty so any guidance would be greatly
appreciated.


WAG says it's probably 400 cycle, as well. not 60Hz.

Design can be fairly simple, particularly if you use a micro-controller
for the 'logic' of phase generation.

start with a clock that is 2 X phases X frequency,
Feed it into a counter, that counts from 0 to (phases-1).
Hang a number of comparators on the counter outputs, one that
triggers for each value.
Send each comparator output through a flip-flop.
(this gives you a 50% duty-cycle output for each phase,
and at the right frequency.)

[now for the "analog stuff

low-pass filter to sine-wave.

Amplify to get the needed voltage/current levels.

Voila!


The digital part can be hard-wired with several discrete logic chips,
or via a cheap micro-processor.