RE: [CAD_CAM_EDM_DRO] Re: SPINDLE speed controller, collets

Hi Brian, Dave,

If treadmill motors have PM magnets, then they're probably 90V DC motors
somewhat like the Sherline spindle motor, and designed for the SCR-type
motor controllers (like the Sherline KB) that I have seen.

The motor in the trim router I have appears to be series wound, with no
separate windings brought out. And the controller I have is only similar to
the Dart 125; it's a MAG-MC-30. It only has ONE pair of outputs; A+ and A-.
No luck finding a manual. It DOES look like it might have been built by
Dart.

Perhaps the motor I have is rated "AC only" because it has limited
inductance? I've seen that in solenoids, "AC only" ratings.

There WOULD seem to be a difference between the two setups. How much, I
don't know!

Alan KM6VV

>
> Hi, most treadmill motors are permanant magnet at least the ones i have
> seen. looking at the speed control books i have here, universal motors
> have
> two types, shunt wound and wound field. one runs on 1/2 voltage for the
> field the other full voltage for the field. if the two sets of winding
> wires
> a pair for field and a pair of wires for the armeture are brought to a
> speed
> control, control should be easy. now if the motor contains electronic
> controls inside the motor or tool that is a different problem. there are
> so
> many new electronic controls some motors are brushless ac, some brushless
> dc
> and the list goes on. cul brian f.