Re: [CAD_CAM_EDM_DRO] Re: Correct or Max voltage for Bridgeport Nema 42? + mo...

Ray:

And Sean, who's originating question I did not read, so I do not know "who he
is": Just because the schematics show a 56 VDC supply, and the BP-1 uses
Size 42 motors, this does NOT mean those are "56 Volt steppers"! Not at all!
There are SEVERAL voltage-ratings for Size-42 motors, and ALL are much, much
lower voltage than that! The "nominal" voltage "seen" by the motor-windings
is an AVERAGE caused by the AVERAGE current passing through those windings as
a CHOPPED DC-current is passed to the windings via the motor-driver. When
the motor is rotating, its effective inductance and therefore reactance
increases, so the "chopping duty-cycle" is increased, effectively raising the
voltage across the windings to maintain the desired current. But the
EFFECTIVE D.C. POWER is constant (except maybe when the motor is at rest, it
might DROP after a second or two, as it does if driven by the SUPER drivers
by Gecko!

Have I been sufficiently confusing? Sorry. I tried NOT to be! Jan
Rowland