For my robotics application, I'm drivnjg 100+ W BLDC motors with a driver that is maybe one square inch. All you need are 6 mosfets and a tiny microcontroller. I have a larger one that handles 50 amp per phase and it is about 6 sq. in. Look at the typical drone, there are four 100+ W BLDC motors and four drivers are 35 mm square and handle four motors. Stuff designed for the machine tool wold assumes you have apple space and power. Stuff designed to fly is typically very light and small.
In any case, what it seems like you need is maybe a sewing machine motor. They are NOT "BLDC", work on line voltage and the speed is controlled by something like a light dimmer. On Tue, Apr 25, 2023 at 8:07 AM gene heskett <ghesk...@shentel.net> wrote: > On 4/25/23 09:27, Thaddeus Waldner wrote: > > What I mean is that specific driver would not fit into my space. I am > currently using a custom 24v BLDC driver that I built. But the only option > for power supply at this point is a wall wart that is about twice the size > of your typical laptop charger, which I’d like to eliminate. > > > > I'm with Todd, confused. > The psu for such a motor all by itself would be smaller than the psu for > the typical 3d printer, but that is still going to be bigger than the > driver, which for one of the motors I'm thinking of needs a length of > 118mm, a depth from mount face to terminals of 86mm, and thickness of > 34mm, part of which is heat sink it does not need unless working really > hard. > > These new drivers can function with up to 90 volts, delivering 5 to 6 > amps into the motor, dependent on the detected error. Motor current is > not fixed, but varies with the detected error so the motor normally runs > dead cool, much more energy efficient than std 2 phase steppers. This is > the power that spins the electrical meter determining your monthly power > bill. The error, if only 1 count between the step-gen count and the > encoder, feeds less than an amp to the motor, 2 count error, maybe an > amp, 10 counts, 4 amps. This is micron accuracy in most direct drive > situations. Their speed limit is more likely to be determined by the > speed of the opto-isolators in the drive input circuitry. Testing these > motors just laying on the table with no load, I've run them with a > function generator at 375 kilohertz! At a /8 microstep, that's over 3000 > revs at 24 volts. At 90 volts, it might be possible to hit the 5000 revs > and still have usable torque to turn the load. > > It might take another box to contain the psu and driver, but I think the > motor itself is capable to doing the job. Wired into hal correctly, a 5 > micron error will stop linuxcnc in a millisecond. Tested, works, but has > yet to occur doing a job. Currently the driver costs more than the > motor, but I suspect that will equalize and lower once the NRE costs > have been recovered, say about a year from now. > > Bleeding edge tech usually has a bleeding edge price... TANSTAAFL. > > >> On Apr 25, 2023, at 7:00 AM, Todd Zuercher <to...@pgrahamdunn.com> > wrote: > >> > >> I'm a little confused, a BLDC motor is still going to need a > drive/driver, weather or not it runs at line voltage, that you say you > don't have space for. How is that going to help you? > >> > >> Todd Zuercher > >> P. Graham Dunn Inc. > >> 630 Henry Street > >> Dalton, Ohio 44618 > >> Phone: (330)828-2105ext. 2031 > >> > >> -----Original Message----- > >> From: Thaddeus Waldner <thadw...@gmail.com> > >> Sent: Monday, April 24, 2023 5:40 PM > >> To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> > >> Subject: [Emc-users] Medium voltage BLDC motor > >> > >> [EXTERNAL EMAIL] Be sure links are safe. > >> > >> HI, > >> > >> I have an application where I need a NEMA 23-size 80-120 watt brushless > DC motor. The machine housing doesn't have space for a 100w DC 24v power > supply, so I would like to use a controller and motor that runs at line > voltage. > >> > >> Does anyone know of a small BLDC/PMAC/Synchronous AC motor that is > designed to run at about 150v coil voltage? > >> > >> Motors this size/voltage are apparently quite common in kitchen > appliances that use pumps or fans, but I cannot seem to find a plain motor > with output shaft. > >> > >> > >> > >> Thanks, > >> > >> Thaddeus Waldner > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > 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, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > 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
