Re: [CAD_CAM_EDM_DRO]
Posted by
Jon Elson
on 2001-11-08 10:21:58 UTC
Dale Smith wrote:
the same (roughly) then I'd probably connect them in parallel. If the
resistance of one set is higher, that is a tachometer output, not a
motor input.
Before I can tell you how to use it, you need to tell me what you want
to do. CNC retrofit a manual mill, maybe? The 220 V .4A rating is
only 88 W, which is rediculous for a 15 Lb (estimated) motor. I
wonder if the data plate is wrong, and these are 4 A motors. That
is more reasonable for the size. let me know the resistance and I
can try to figure that out. When measuring motor resistance, you
have to move the shaft in small increments and take the lowest
steady reading. (Brush contact is real bad when the motor is not
turning.)
Jon
> Steve, et. al.I'd measure the resistance across each set of brushes. If they are
>
> Now that you have made the fatal error of showing some knowledge of DC
> motors my next victim is obvious.
>
> Some time back, I also made the error of thinking a DC motor is a DC motor,
> is a DC motor...... and bought three big ones. They are about 5 inch dia x
> 11 inches long with 5/8 shafts out each end. One bare back end, one looks
> like it has an encoder and one has something else (only 2 wires) Square
> flange mount.
>
> The things have a pair of brushes on each end. Each pair of brushes is
> serviced by 2 wires approx 16 gage.
> The data plate says 220 VDC .4 A (400MA) 2200 RPM
>
> 12VDC will run the motors through either set of brushes alone.
>
> 12 VDC willl run the motors much faster if the brushes are connected in
> series.
>
> 12 VDC will make the motor jump up and down if you wire the brushes in
> series the wrong way.
>
> They produce a lot of voltage when turned by hand.
>
> Photos and additional info cheerfully furnished if it will assist in solving
> the eternal question "Whatthehell did I buy and how do I use it?)
the same (roughly) then I'd probably connect them in parallel. If the
resistance of one set is higher, that is a tachometer output, not a
motor input.
Before I can tell you how to use it, you need to tell me what you want
to do. CNC retrofit a manual mill, maybe? The 220 V .4A rating is
only 88 W, which is rediculous for a 15 Lb (estimated) motor. I
wonder if the data plate is wrong, and these are 4 A motors. That
is more reasonable for the size. let me know the resistance and I
can try to figure that out. When measuring motor resistance, you
have to move the shaft in small increments and take the lowest
steady reading. (Brush contact is real bad when the motor is not
turning.)
Jon