On Thursday 15 October 2020 12:55:16 Chris Albertson wrote: > Gene just Google the part number "VNH3SP30". Polulu has them. It is > in fact my "go to" driver. These were developed for automotive use > for things like driver seat adjustment motors. > > Polulu's version of this has reverse voltage protection but they > seriously de-rate the chip. Just read the datasheet that is linked > from their site. > > Here is the way I used these... > I buy a slightly different version of the chip that comes on an > "Arduio Sheild" ebay link > <https://www.ebay.com/i/401089386943?chn=ps&norover=1&mkevt=1&mkrid=71 >1-117182-37290-0&mkcid=2&itemid=401089386943&targetid=934793863816&devi >ce=c&mktype=pla&googleloc=9031026&poi=&campaignid=10877149888&mkgroupid >=107912403075&rlsatarget=aud-622524042918:pla-934793863816&abcId=930040 >0&merchantid=101638797&gclid=CjwKCAjw5p_8BRBUEiwAPpJO6-QTPa9wyIxLjU-wVv >6qq8PaY8DUPaxrZw7TRhXg8XKzfNEiapIrIhoCidAQAvD_BwE> Then I buy a Nucleo > board from STM www.digikey.com/...NUCLEO-F401RE > <https://www.digikey.com/en/products/detail/stmicroelectronics/NUCLEO- >F401RE/4695525?WT.mc_id=frommaker.io> These mate together with a bunch > of 0.1" header pins. > This latter link might be the cats purr, but I didn't see any links that tell me how to put it to use as I've never dealt with the stm32.
Since I'll have the drivers in a week, and already have the 30 some page technical pdf, I'll see what else I need by then. i/o pins to drive it I have plenty of. usb is not "real time", so that path is not one I would normally take anyway, although with usb3, the speed objection is largely nullified. However, the only usb3 stuff is on an rpi4, 15 feet away and tied up with SSD's. That old dell, where this is going, is usb2, so are the D525MW's I have 2 of. > With some software in the STM32 I now have a USB connected dual motor > driver that can handle up to about 20 amps peak and 12 A continuously > The control PID loops run on the STM32 and I only have to send speed > or position commands over the USB cable. It would be about as easy to > assemble an Ethernet or SPI connected motor controller from these same > parts. The stack-up is a little bulky but it is so easy to do and > cheap I can put up with the excess cubic volume. > > On Thu, Oct 15, 2020 at 9:12 AM Gene Heskett <ghesk...@shentel.net> wrote: > > On Thursday 15 October 2020 08:32:07 Roland Jollivet wrote: > > > Maybe this is good for you, if available locally; > > > > > > https://www.olimex.com/Products/Robot-CNC-Parts/MotorDrivers/BB-VN > > >H3SP 30/open-source-hardware > > > > I give up, none of the 3 USA distributors are carrying that item. > > > > > On Wed, 14 Oct 2020 at 22:42, Gene Heskett <ghesk...@shentel.net> > > > > wrote: > > > > After it finally was delivered, testing looks good but now I > > > > need a controller, smaller and lower voltage than one of Jons > > > > pwm-servo's. > > > > > > > > This motor supposedly turns 220 rpms no load with 24 volts > > > > applied. > > > > > > > > It has an encoder on the rear which is making a 5.4khz > > > > quadrature signal when its running free, out of 4 wires, no > > > > index which is fine as I'll put a switch on the BS-1 for a > > > > home/index anyway. > > > > > > > > This motor draws 4 amps at max rated 100 watt input. > > > > No clue what the LRA amps is but it does jump pretty good > > > > getting started so I'd expect startup in-rush to be at least 10 > > > > amps. > > > > > > > > I'd like to control its position like a common rotary servo > > > > axis, so what do we have in our linuxcnc toolbox that looks like > > > > a bi-dir pwn controlled twin H bridge to run a 24volt brushed > > > > PMDC motor with a 10 amp in-rush as if it were a servo? [...] Thanks Chris. 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
