shaded pole motor control
in [Design]
|
Prev: Russian Spies ???? This is Hilarious !!!!! Does anyone BELIEVE it ? after 911 Inside JOB and ANTHRAX
Next: Testimonial VIDEO for Honorable Prime Minister Vladimir Putin of the Russian Federation
From: ontherails on 20 Jul 2010 15:51 >What was this circuit called 40-75 years ago? > >I Googled around for "motor control transformer short secondary" but >didn't come up with anything relevant. > >Thanks! > >Michael > I've never seen this circuit before I 'discovered' it - I won't say I invented it as it is so fundamental someone must have done this before. However, I've never seen it in any magazine (Wireless World / Practical Electronics) or book on electronics control going back to the late 60s and I can't see anything on Google even remotely like it. One thing to be very careful of if using this circuit is NOT to have any capacitors across the load (motor). This could form a series resonant circuit with the primary winding inductance and I totally wrecked one transformer this way before I realized what was going on. As protection you should have no more than a 1 amp fuse for a 100VA of transformer rating. If the fuse blows investigate the problem. Peter --------------------------------------- Posted through http://www.Electronics-Related.com |