From: "Kevin Doney"
Subject: Re: allegro micro 5804 pinouts/stepper motor coil naming
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 13 Dec 2002 21:07:15 GMT
NNTP-Posting-Date: Fri, 13 Dec 2002 13:07:15 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Current limiting resistors are important and their selection depend upon the
motors, drivers and power supply you are using. A crash into a fixture or
table is upsetting but when it causes blown driver(s) and/or controller
(with EMC you're talking about your PC) it is very upsetting.
"David Margrave" wrote in message
> I'm controlling an 8-lead uniphase stepper motor (converted to 6 lead
> connections) from an allegro micro 5804. The pinouts on the datasheet
> for pins 1-6 are something like B, B-D common, D, C, C-A common, A.
> This is not consistent with the pinout shown on a stepper motor kit
> (kit 109 from kitsrus.com) which I also assembled to get my feet wet,
> and it also inconsistent with the label for the motor leads/coils on
> the stepper motor data sheet (it's a pacific scientific powermax).
> The usual notation is A, A/B common, B, C, C/D common D.
> After reading the descriptions of the phase diagrams on the allegro
> datasheet and the stepper datasheet, it appears that allegro micro may
> have renamed the coils so that the order of output pulses in 'wave'
> mode is ABCD instead of DACB (or whatever).
> I'm hoping to build a CNC milling machine to be driven by a realtime
> linux system with NIST's enhanced machice controller. I was able to
> run some simple tests that did cycle the motor through a wide range of
> speeds and it worked fine, so I assume that I've gotten the motor's
> coils properly connected to the stepper controller. I assume it would
> hop around excessively or growl if not hooked up properly. I'm
> currently operating without diodes or power resistors on the output
> leads. How vital is it to have these, and can anyone suggest some
> good component values?