On Sun, 2012-03-04 at 11:43 +0100, Joachim Franek wrote: > Hello, > > I can report some progress for my attempts to > drive 3 phase motors. I do this to be familiar with the > bldc component and use for safety low voltage devices. > > My setups: > Electronics: FAN7382 and BUZ11 board > (http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Bridges_-_Half,_Full,_Three_Phase) > Hal: > loadrt threads name1=fast fp1=0 period1=50000 name2=slow period2=1000000 > loadrt encoder num_chan=1 (parport is used) > > 1. BLDC motor 24V 100W; 3 hall signals; encoder 3ch, 500 > loadrt bldc cfg=hB6 > loadrt pwmgen output_type=0 (to the upper fets) > setp bldc.0.pattern 0x00000019 > > 2. SPSM motor (Panasonic) 62V 200W; no hall signals; encoder 3ch, 2500
I don't know what a SPSM motor is, but from this they can get big: http://www-personal.engin.umd.umich.edu/~chrismi/publications/2009_45_12_TMAG_Solid_equi.pdf > loadrt bldc cfg=iqB6 > loadrt pwmgen output_type=0 (to the upper fets) > setp bldc.0.poles 8 > setp bldc.0.scale 10000 > > 3. Asynchon motor 230V triangle, 120W; encoder 3ch, 500 > loadrt bldc cfg=n > loadrt pwmgen output_type=2,2,2 (to all fets) > > Results: > 1 and 2 works nice. > Speed is limited from encoder parport usage. Sounds like you are ready for an FPGA card (if you had one). > But I see cross current > in case one leg is active from pwm and a > commutation occurs. Then for about 120ns > I measure a current of 70A (peak). > I need a comp to delay the rising edge > on the upper fet for one cycle of the fast thread > in case in the last cycle the fet was on. > And the same for changed roles. > I think in case of a high voltage setup this > destroys something. That has been my understanding from my reading on the subject. The higher voltage arena really takes the bar to a higher level. The IRAM series of modules advertise features that safeguard against shoot-through due to lax signal timing. > To 3: Up to 5Hz this works. Distorted > (pwm sine modulated) currents are observed > because of limited pwm resolution. What area are you located? I could send you a Pluto-P and EPP parallel port PCI card, which could provide much faster I/O. I'm concerned the postage would be prohibitive. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
