Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info

Announcement: End-of-Year Fundraising Drive In Progress

Our End-Of-Year Fundraising drive is in progress. If you haven't contributed to the operation of the MMD in the last 12 months, this would be a great time to contribute. There's a PayPal link at the bottom of each page on the website.

If you aren't sure when you last contributed, please send me a note using the contact form at the bottom of this page and I'll look you up in my records.

Thank you for your generous support!
Jody

P.S. While your support is needed and appreciated, you do not need to contribute to be a subscriber. If you have subscribed and aren't receiving your Digest, please use the contact form at the bottom of the page and let me know. Thanks!

MMD > Archives > January 2001 > 2001.01.30 > 07Prev  Next


Stepper Motor Circuits
By Spencer Chase

I thought that people stopped using series resistors with stepper
motors years ago as the chopper drivers became cheap.  The problem with
using too high a voltage with steppers is that they will overheat when
in a locked position  for an extended period.

The modern solution is to use a pulse width modulated (chopper) driver
that supplies high voltage to the motor but drops this voltage by
reducing the on time portion of a square wave fed to the motor when the
motor is at rest.  You can buy ready made controllers that do this or
you can make your own with a combination of the good old reliable L297
driver and L298 H bridge made by SGS Thompson.  I am not familiar with
the design of the MIDster so I do not know if it uses step or phase
signals, but it should be easy to modify the software to provide the
step and direction signals for the L297 driver.

You will be amazed at the work a small stepper can do with one of these
drivers or even better with a more modern commercial ready made unit
that shouldn't cost more than about $125.

Spencer Chase
http://nt.mcn.org/spencer/


(Message sent Tue 30 Jan 2001, 07:45:06 GMT, from time zone GMT-0800.)

Key Words in Subject:  Circuits, Motor, Stepper

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google
Loading



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2017 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                                       
Translate This Page

. .