I integrated a lot of 7i39's, thus I know them well enough. But they are rated at 250W, HV version limited to 7.5A per phase, which, when reached, makes quite big torque gap, so it is not recommended to use 7i39 near its maximum current limit. I even found better lead angles not to trigger 7i39 overcurrent protection, solved over-voltage problem while decelerating.
I would say 250W-300W is their maximum limit, while 250W rated motor can get or even deliver 750W power temporarily, which is very useful for acceleration or other temporary load conditions. Not to mention averaging of sines, which shows 7i39's even weaker. Pico BLDC PWM servo amplifier is something I considered earlier, but did not choose as it has no sine commutation capability. I am looking at it with new eyes. I could use it for some applications. I know IRAMS module, but I doubt they are capable to deliver 10-15 Amps per phase, which are needed for such voltage motors of similar power. Yes, IRAMS could be great for higher voltage motors.. Looking from economic point of view it would be great to have amplifiers for such motors in a price range between 60 and 110 USD for one motor IMO. On 2015.06.15 00:38, andy pugh wrote: > On 14 June 2015 at 21:08, Marius Alksnys <marius.alks...@gmail.com> wrote: >> Does anybody know BLDC motor drivers suitable to run BLDC servo motor: >> rated at 230W, 48V, 8 poles, 3000 RPM? > Both Pico and Mesa do drivers that are suitable. > http://pico-systems.com/osc2.5/catalog/product_info.php?cPath=3&products_id=20 > http://store.mesanet.com/index.php?route=product/product&filter_name=7i39&product_id=145 > > The Anaheim ones should work too, but note that the Pico one is rated > to higher voltage and the Mesa one is actually a dual-motor driver. > However it needs to be connected to a Mesa FPGA card to operate as the > 3-phase PWM signals are created by the FPGA, not the drive. > >> I want to control the motor using one PWM and three hall signals or >> three phase PWM. >> Has anybody succeeded running some simple BLDC drivers for that? > I built my own (300V drive) using an IRAMS module. > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
