Steve, From my, albeit somewhat limited, experience I don't think that you will be that happy with the performance of running the drives at that voltage. I have some experience with running brushed motors at just over half voltage and then later going to full voltage on the same machines. Running with a maximum of 80v means a 37% drop in voltage. The biggest place that I think you would see it is in poor acceleration and deceleration. You would likely be limited to about 1/3 the IPM that you would running full voltage because you need to have enough reserve to decelerate without causing a following error. This might be even worse with a brushless but I just don't have experience with them.
You could certainly try with those amps while you look around for different ones. You won't hurt the motors. On 01/25/2017 06:10 AM, Steve from Tube Gauge 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 >
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