On Thursday 29 October 2020 14:08:37 Chris Albertson wrote: > 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.
But this one wasn't built for car apps, its made to run driveway gates sliding across estate driveways, supposedly to keep out the riff-raff like me. :) And it has a builtin encoder so the gate driver knows where the gate is. That sort of stuff tends to be 24 volt based. Less power loses on lighter ga wiring etc. The price of copper often drives that design choice. UL also has vastly different safety rules for 24 volt compared to 120 volt stuff. But you knew all that. :) [...] 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
