Interestingly, this sort of sensor would have been helpful on my latest problem with the lathe spindle Z pulse encoder I wanted to run on a pulley at 3x the spindle rate, presuming there was software support for it. In my case the pulse length accounting would have had to have been in the 7i33 firmware though. Being able to count a backwards pulse as backwards would have allowed me to accurately ignore every third pulse in software, regardless of rock back or other spindle changes in direction.
Scott On Fri, Nov 23, 2012 at 2:00 PM, Jon Elson <el...@pico-systems.com> wrote: > Stuart Stevenson wrote: > > Seems to me a resolver would be the best choice for position on start up. > > Velocity could be derived also. A resolver on the cam and crank could > tell > > you the next piston to reach tdc > You check the price on a resolver, lately? The problem is a wound-rotor > brushless resolver > is pretty expensive to make. The bigger they are, the more expensive, too. > Variable reluctance resolvers are cheaper, as there are no windings on > the rotor, and > so can be made arbitrarily large. but, those have multiple poles/rev, > and so you > don't get absolute crank position at power-on. So, from a cost > standpoint, alone, > I don't think the auto makers are going to go to a resolver over a cheap > solid state > sensor. One absolute sensor on the cam would be all you'd need, they have > plenty of resolution. > > Jon > > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
