On Fri, 21 Jun 2013, propcoder wrote: > Date: Fri, 21 Jun 2013 00:12:58 +0300 > From: propcoder <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: [email protected] > Subject: Re: [Emc-users] BLDC - not smooth rotation with hostmot2 and 3-phase > bridge > > Ok, I understood that voltage, much higher than rated for motor is not a > good idea (unless in my case). > > I tested IRAM board with 42 Volts. And motor behaves almost the same. > There are positions where torque appears to be very low. Maybe there is > something to do with how high and low transistors of different phases > are switched? Now all of them switch on and off every switching period > (let's say at frequency of 12kHz). Maybe I need to give some scope shots > to make it more clear? Or should I compare it to 7i39 switching > waveforms? Or maybe add current sensors and measure currents? >
I would make a low pass filter with a resistor and capacitor (say 100K and .1 UF) to filter out the PWM and look at the filtered output voltage waveforms I suspect there is some large distortion of some kind perhaps caused by switching time of the IGBTs > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
