On Thursday, June 02, 2011 02:01:42 AM Jon Elson did opine: > gene heskett wrote: > > Well, I did the deed, and I have verified that when the switch is off, > > there is a dead short across the receptacle the motor is plugged into. > > About 20 tests with the saw motor plugged into it, no effect. Unplug > > the saw motor and plug in a cheap Skil router I have installed in the > > right table. Also no effect. Both coast to a stop as usual, taking > > about 15 seconds for the saw, and at least 10 for the router to come > > to a complete halt. > > > > Two universal motors in a row with absolutely zero residual > > magnetism??? > > > > Is the grain oriented silicon steel that most of these field stacks > > are made of for the last 25 years that free of hysteresis? > > > > Boggles this old electronics types mind... > > Well, that lawnmower motor may have had some special feature, either in > the steel, the shape > of the field poles, or something that made this work. Maybe they even > had a little permanent > magnet buried under the field windings.
This might be a place for one of those super magnets? > Very interesting that this > doesn't work at all on those > motors. Now, on the router, it needs to be one with no speed control > built into it, I can > easily see an SCR speed controller preventing the shorted power source > from making this > work. Also, a number of routers even without speed controllers have a > bridge rectifier > in them, so they run the motor on intermittent DC. > No such luck, I've had one of them apart. No rectifiers. My pet Hitachi router with the speed control and soft start would be another horse entirely. I should take inventory some day & see how many routers I have. ;-) > Jon > > > ------------------------------------------------------------------------ > ------ Simplify data backup and recovery for your virtual environment > with vRanger. Installation's a snap, and flexible recovery options mean > your data is safe, secure and there when you need it. Data protection > magic? > Nope - It's vRanger. Get your free trial download today. > http://p.sf.net/sfu/quest-sfdev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> <http://www.cantrip.org/gatto.html> After an instrument has been assembled, extra components will be found on the bench. ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
