For permanent magnet motors there is a rather linear correlation between RPM and voltage although field weakening might be possible to lower voltage then loaded below rated torque.
On Wed, 25 Jan 2017 07:10:05 -0500 "Steve from Tube Gauge" <[email protected]> wrote: > Hi: > > I have a CNC mill that I am considering replacing the control with LinuxCNC. > The motors are the red cap Fanuc units. I have enquired on this mailing list > about using the existing servo amps and motors. From all the replies and > help (thank you very much) I haved concluded that a good solution for me is > to remove the Fanuc encoders and amps and replace them with suitable units > that can communicate on an industry standard format. To that end I am > considering using some AMT31 programmable encoders by CUI (or other encoder > suitable for 8 pole motors) and some BE40A8 AMC amps that I have sitting on > my shelf. > > I am aware of the rpm/voltage relationship with brush DC motors. Generally, > as the voltage rises the motor rpm increases a proportional amount. How does > the voltage influence the performance of the brushless motor? The Fanuc > motors are 5S models, 126 V (DC?), 5.8A stall. The BE40A8 have a maximum > running voltage of 80 VDC. Will running the motors at the lower voltage > result in dramatically reduced performance? Will it cause other electrical > problems like an excessive rise in current demand by the motor? > > Thanks for your help - Steve V > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
