Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: marklewry
  • Content: Threads
  • Order by date
  1. marklewry

    Unipolar chopper design

    Hi all, I previously posted a message here with regards to this problem but have been experimenting since and come up with some new results... I have designed and built a Unipolar chopper drive for an a lead Bifilar wound stepper (4Amp 0.85Ohm 1mH approx). I have had good success running smaller...
  2. marklewry

    Unipolar chopper drive with bifilar wound motor?

    Hi all, I previously posted a message here with regards to this problem but have been experimenting since and come up with some new results... I have designed and built a Unipolar chopper drive for an a lead Bifilar wound stepper (4Amp 0.85Ohm 1mH approx). I have had good success running smaller...
  3. marklewry

    Stepper Induction

    Hi all, I have recently built a drive board for a stepper motor. This is a unipolar drive and simply has 4 mosfets, 4 fast recovery diodes and 4 1 ohm 3watt resistors (2 in parallel = 0.5 ohm sense resistors). All was going well until I encountered a problem using a different motor. The...
  4. marklewry

    Stepper induction

    Hi all, I have recently built a drive board for a stepper motor. This is a unipolar drive and simply has 4 mosfets, 4 fast recovery diodes and 4 1 ohm 3watt resistors (2 in parallel = 0.5 ohm sense resistors). All was going well until I encountered a problem using a different motor. The...
  5. marklewry

    Inductive Switching Problem

    Hi all, I have undertaken a project to build a 4 axis router type machine. I am attempting to build the stepper motor cicuits myself. I had already built one using the L297 + L298 chips from ST Semi but found that something was going wrong with the drive chip and it kept on blowing. I have now...
  6. marklewry

    Moving equipment to different country

    I have a job comming up that involves estimating the problems involved with moving different types of automated equipment from one country to another. I need advice on what types of things to consider when running a machine on a slightly lower voltage and higher frequency (from 240v 50Hz UK to...

Part and Inventory Search

Back
Top