Not really newer, just different specs. The "2" version goes up to only 16 volt and is used for automotive motors powered from 12 lead acid batteries. The "3" has a higher voltage rating. I think some other slight differences too.
What you are really doing here is building a DIY servo motor. An H-bridge and PWM are used to drive a quadrature encoder to the desired position and rate. The nest question is "Where to attach the encoder?" Placing it on the motor shaft gives best regulation and control of speed but placing it on the faceplate removes all the backlash On Thu, Oct 15, 2020 at 10:43 AM Thaddeus Waldner <thadw...@gmail.com> wrote: > I see that some of these use the > VNH2SP30 and some use the > VNH3SP30. > > Is one of them a newer revision of the same chip? > > > On Oct 15, 2020, at 12:02 PM, Chris Albertson <albertson.ch...@gmail.com> > wrote: > > > > forgot the link https://www.pololu.com/product/705 < > https://www.pololu.com/product/705> This is different > > because the Polulu version has a MOSFET to protect from connecting the > > power supply backward. This likey matters more in battery-driven > > projects. > > > > But really they are all the same H-Bridge. Just buy one rated for the > > volts and amps you need. > > > > On Thu, Oct 15, 2020 at 9:55 AM Chris Albertson < > albertson.ch...@gmail.com <mailto:albertson.ch...@gmail.com>> > > 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=711-117182-37290-0&mkcid=2&itemid=401089386943&targetid=934793863816&device=c&mktype=pla&googleloc=9031026&poi=&campaignid=10877149888&mkgroupid=107912403075&rlsatarget=aud-622524042918:pla-934793863816&abcId=9300400&merchantid=101638797&gclid=CjwKCAjw5p_8BRBUEiwAPpJO6-QTPa9wyIxLjU-wVv6qq8PaY8DUPaxrZw7TRhXg8XKzfNEiapIrIhoCidAQAvD_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. > >> > >> 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-VNH3SP > >>>> 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 all. > >>>>> > >>>>> 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 > >>>> > >>>> _______________________________________________ > >>>> 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) > >>> 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 > >> > > > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net <mailto:Emc-users@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/emc-users < > 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 > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
