Re: [CAD_CAM_EDM_DRO] Re : motor woes

On Sat, 16 Mar 2002 07:28:05 +0000, you wrote:

>> steve@...
>>
>> Has anybody used Astrosyn 8 wire T180 universal motors?
>>
>> Specs are as follows - 12v 0.6 amp/phase Res 20 Ohm/phase
>> Inductance 35mH/phase Torque 5.5Kg-cm.
>>
>> I can't get the damn things to run at anything above a crawl
>> without missing steps!!
>>
>> I'm running them in unipolar mode with a home built
>> controller based on UDN5804B's
>
>This is no surprise. 12V motors have to have a LOT of inductance.
>Runing them unipolar makes it even worse. What is your DC supply
>voltage? Is this an R/L drive or chopper type?

I'm tried them from 12-30V with current limiting, R/L but from what
you and Tim have said it looks like they are never gonna run fast.

I'm going to return them and if I go for unipolar probably get StepSyn
103H7123-0410.

Specs for these are 3.2V, 2A, 1.6Ohm, 3.8mH per phase.

I've now found a schematic for a simple chopper driver using
L297/L298's , I now may go with Bipolar type motors, if I can remember
how to use Protel to produce the PCB :)


Steve Blackmore
--
Pilot Consultancy Limited ***** Computer Consultants
Telephone 01744 752256 Mobile 07831 768478
Email: steve@... WWW: http://www.pilotltd.net