You are getting your motors mixed up. Typical AC induction motors suck for positioning.
You are thinking of AC servo motors that use a magnetic rotor. They are a totally different animal. DC servos typically have wound armatures (and brushes) and use magnets for the field. Dave On 1/24/2016 10:56 AM, Stephen Dubovsky wrote: > The positioning ability of an induction motor is no different to that of a > DC servo motor. When no torque is needed both go to zero voltage/current > to stop moving (though technically an induction motor can maintain a DC > current if it chooses to to provide braking - similar to shorting out the > DC motor leads.) When torque is needed to maintain position excitation > must be applied to each. Only difference is one is DC and one is AC. > There are plenty of AC induction servos. They are typically one of the > highest performance machines as the rotor inertia can be made lower than DC > or PMSM rotors. It does take more advanced control software. Also, the > wider torque vs speed curves are typically unmatched. > > On Sun, Jan 24, 2016 at 9:37 AM, Dave Cole <linuxcncro...@gmail.com> wrote: > >> Is the positioning ability adequate? >> >> Most squirrel cage motors are really bad at positioning under load as >> they rely on slip to generate armature flux. No slip -> no flux -> no >> torque But you are just trying to position the tool for the changer, >> right? >> >> The best I have seen for positioning with a load is basically a >> coast/brake to a stop position and then a brake is applied at the stop >> position. >> >> Is there a reason why you did not use the hal component that Andy >> pointed out? Or did you modify that? >> >> Dave >> >> On 1/24/2016 7:19 AM, Marius Alksnys wrote: >>> and in orientation / position mode I_out is constant and f_out is >>> controlled by PID. >>> >>> >>> >> ------------------------------------------------------------------------------ >>> Site24x7 APM Insight: Get Deep Visibility into Application Performance >>> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >>> Monitor end-to-end web transactions and take corrective actions now >>> Troubleshoot faster and improve end-user experience. Signup Now! >>> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> ------------------------------------------------------------------------------ >> Site24x7 APM Insight: Get Deep Visibility into Application Performance >> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >> Monitor end-to-end web transactions and take corrective actions now >> Troubleshoot faster and improve end-user experience. Signup Now! >> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
