Jerry wrote:

I considered that when one motor is
running after being easily "spun up", it becomes a Rotary Converter for
the other two motors.

You forgot, that the motor's shafts aren't connected. This is a saw (or
such) with three separate motors.
You have to draw a diagram how the three legs of the three motor are
connected. You don't want?
I'll describe it with words:

L1, L2, and L3 are the phases. M1, M2 and M3 are the motors.
L1 is the only phase available, so you connect it to M1L1. M2L1 and M3L3 are
open, because we don't want to let them run. OK so far?
Now the voltage generated in M1L2 and M1L3 goes where? Nowhere, because they
are not connected on M2 and M3 (because we don't want to let them run).

Now we let run all three motors at the same time.
Connections:
M1L1 to M2L1 and M3L1
M1L2 to M2L2 and M3L2
and
M1L3 to M2L3 and M3L3

Now the voltage generated in M1L2 is feed into M2L2 and M3L2 (same for L3).
But at the same time M2 and M3 generate voltage at L2. Now do you really
think that one motor can drive L2 and L3 of the two other motors and at the
same time doesn't lose any energy?
Note that I disregarded losses and was talking about an ideal machine.


Do you actually think any of
the information I have posted is wrong?

Absolutely. :-)

You might take some time to think about this
Rotary Converter stuff before writing about *my* errors.

This ain't a rotary converter!
OP cite:
| ... is looking at buying a Felder combination woodworking
| machine with 3 4kw motors in 3 phaze ...


Nick
--
The lowcost-DRO:
http://www.yadro.de