Cannot get working 5i25 + 7i76 + 8i20

I dont understand why you had to set the baudrate
however.
That does sound like the EEPROM data (and perhaps more)
is scrambled. Perhaps the 8I20 should be returned,
as none of this makes sense.

I would try to reset EEPROM values as you advised with a batch file and if it does not help I will return the board.

I am almost sure should be a way to reprogram entire EEPROM with an image, not just setting individual values.

OK we played around with some test batch files and found there a handshake bug in WPD
that may cause EEPROM corruption. If you download the 8i20.zip file:

www.mesanet.com/software/motion/8i20.zip
has new WPD/RPD utilities and a 8I20INIT.BAT file
that restores the 8I20 EEPROM to its default settings

Yes it helped!
No more errors and 8i20 pins has values those make sense.

It looks like I triggered this bug, I used a BAT file from the beginning.

Now I am working on 8i20 + bldc hal configuration..

Thanks a lot for help.

I got my motor spinning on 50Hz in free-running mode with no motor feedback.
For some reason it is very noisy and shaking a bit.
I would guess it is the current loop oscillation.
Is there any way to verify if current loop is tuned ok?

Running a BLDC motor without feedback for proper commutatiion will always be noisy and inefficient
but Its not likely to be current loop related (current loop oscillations will be in the KHz region)

Note: for best commutation you should run your servo thread as fast as it will go (4KHz is suggested if possible)
also there is a improved version of BLDC in master that doubles the commutation timing accuracy
I would suggest using that as well

I am not able to configure 8i20 and bldc hal component. I use incremental encoder 1024 pulses and Z index directly connected to the shaft of the motor.

It finds home position as expected and stops on it and after holds this position as stronger asbldc.0.value is increased.
If bldc.0.value is set to zero, after homing there is no torque on the shaft and I can rotate it with my hand.

As I expected it should work as a torque servo and its torque should be controlled by asbldc.0.value.

What I am doing wrong?
This is the part of my hal file:

loadrt bldc cfg=iq
addf bldc.0 servo-thread

setp bldc.0.rev 1
setp bldc.0.initvalue 0.5

setp bldc.0.poles 5
setp bldc.0.scale 4096 # Encoder gives on one turn 4096 counts. (1024*4)

setp bldc.0.init 1
setp bldc.0.value 0.5

setp hm2_[HOSTMOT2](BOARD).0.encoder.00.scale 4096.0
net ENrawcounts hm2_[HOSTMOT2](BOARD).0.encoder.00.rawcounts => bldc.0.rawcounts
net ENindex-enable hm2_[HOSTMOT2](BOARD).0.encoder.00.index-enable => bldc.0.index-enable

net rotor_angle hm2_[HOSTMOT2](BOARD).0.8i20.0.1.angle bldc.0.rotor-angle
net current bldc.0.out hm2_[HOSTMOT2](BOARD).0.8i20.0.1.current

Thanks.

Are you sure the motor has 5 poles? that sounds pretty strange.
You can count poles by applying a little current at a fixed angle (disconnect the encoder) rotating the shaft and counting the null positions (stable rest positions)
the number of rest positions *2 is the number of poles.

PCW wrote:

Are you sure the motor has 5 poles? that sounds pretty strange.

I will verify as you explained.
To calculate poles I used this logic:

On 250Hz it gives 3000 RPM (I used Digital tachometer to measure RPMs)

3000 RPM -> 50 RPS -> 250Hz/50RPS = 5 poles.

The same written on motor’s sticker:

www.linuxcnc.org/media/kunena/attachments/17527/DSC03523_.JPG

RATED FREQ. 250HZ
RATED REV. 3000 r/min

That is a 10 pole motor