If the motor is expensive or hard to get, keep it and use a driver rated for more volts. As said, you can buy four MOSFETS and make a driver that is good enough for a use-case where A/C mains is available and you are not trying to squeeze every drop of power from a battery. Homemade h-bridges tend to waste power and turn it to heat. But maybe not. Today they sell "logic level" MOSFETS that you can drive with 3.3 volts.
If you don't like dealing with low-level drivers they sell controllers that work at a high level and will servo the motor to some commanded position. But you'd pay $100 for that. or $4 for a handful of MOSFETS. Good 12V motors are really cheap because they are mass-produced for the automotive industry. On Wed, Oct 28, 2020 at 3:19 PM Gene Heskett <ghesk...@shentel.net> wrote: > On Wednesday 28 October 2020 16:42:30 Chris Albertson wrote: > > > Looks like you should buy a few MOSFETS and make an h-bridge. But > > driving the lower side of the h-bridge from 5 volt logic level is not > > super easy. > > > > Either that or just use a 12Volt motor > > > It took me 4 months to buy that 24 volt motor. People were advertising it > on ebay who did not in fact have it for sale. The first guy that offered > to sell it to me turned out to be the same jerk who sold me the 6040 > mill with the junk electronics that I had to replace one of the motors > and all of the electronics before I had a working mill. He drug me > around for a month before finally getting the message that I wanted the > motor fedexed overnite or canceled. He canceled and refunded my card. > > The next guy, who claimed it was in the same warehouse in Chino CA, was > still over 3 weeks getting it here by fedex. > > And now you want me to change it for a 12 volt motor? A 90 volt would > make more sense as I've spare psu capacity and another of Jon's > pwm-servo's to drive it with once its repaired. But either version seems > to be made of the same unobtainium as hens teeth. So I've bought two > copies if a 36 volt, 15 amp controller I can run using the same signals > as the first 2 boards I would need to run in well deionized water for > coolant. But I'd need a place for a well sealed 5 gallon tank and a > water pump big enough to both cool the chips AND pump some of it thru a > deionizer cartridge, another very expensive item. You learn about that > around broadcast transmitters as stuff above 10 kw, is usually water > cooled. And the water circulates between grounded plumbing and anode > voltages rangeing up to 7200 volts. Pure water is an insulator. > > You keep that water in perfect insulating condition or replace expen$ive > stuff every 6 months from corrosion. > > [...] > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
