Re: Stepper motors ( giants ) cheap.

--- In CAD_CAM_EDM_DRO@egroups.com, "Art Fenerty" <fenerty@h...>
wrote:

>

http://www.aaaim.com/cgi-local/shop991/shop.pl/SID=169252838262/page=S
TMS.htm#SSM2000

> This sounds like an excellent solution for those of us who don't

have the "better half's" financial support!! HEHE Do you have a
circuit diagram for the controller/driver you are using? I have
built
a driver using L298's and it works beautifully but the operating
voltage of the syn. motors is way too high for the 298's. Does
anyone
know if I could use solid state relays controlled by the 298's?
Would
the relays be fast enough to react to the step commands?

> The 720 oz/inch AC syncronous motors on the above page are the ones
> I rewired to make large and strong steppers. They work pretty good

on my router table.

> I get 4"/sec with alot of torque. They tend to be very cheap

compared to strong steppers

> and the only drawback is a maximum 72RPM. With microstepping you

don't have

> to gear down much.
>
> You just cut out the circuit board in the back of the motor,
> and wire the 4 - 90degree opposing coils together, to create
> each of two bipolar windings.
>
> 1 ---- 2
>
> 3 5
> | |
> 4 6
>
> 7---- 8
>
> wire together 1,8,4,5 as wire Phase A common
> wire together 2,7,3,6 as wire Phase A Hot
>
> Rotate the motor 90 degrees and repeat the proceedure on the

remaining 4 coils for

> Phase B.
>
> Thats it, Close the motor up, connect to a controller ( I use

55Volts at 1.8Amps microstepped )

> and away you go. They don't heat up and have lots of power, so I

think the Voltage could be

> increased to about 180VDC with no problem.
>
> Let me know if you need more info.
> Art
>
>
> [Non-text portions of this message have been removed]