Re: Treadmill motor / PWM vs .SCR

Hi Steve,

How bad was it when you tried it as a servo??
What happens?

BTW I tried to look up the controller and came across this...

"Building a DC Drive for the Bridgeport Spindle"
http://www.truetex.com/dcdrv.htm

John

> I'm running a US made "treadmill motor" as a spindle motor on an SX3
> mill, it says on the label 2.75 HP, but I've yet to get it draw anything
> more than 12A or so. Says 21A at 110V on the label.
>
> The brushes are 180 degreed to the armature and the motor casing,
> despite this it's 1000 rpm down in "reverse" to it's normal 5700 rpm. at
> 100V. (It's continuous rated voltage) It has 12 windings on the
> armature. It's "coggy" at less than 500 motor rpm. It's had an encoder
> fitted and tried as a servo and failed. It generates a lot of heat and
> has to be fan cooled.
>
> Works OK in it's present use linked to a KB240 speed controller with a
> 2:1 reduction to the spindle.
>
> YMMV.
>
> Steve Blackmore
> --
>