Phase Drive Questions
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06 Apr 2024 16:49 - 06 Apr 2024 16:51 #297701
by D-wilson357
Phase Drive Questions was created by D-wilson357
Hello,
I am converting a system that ran on TURBOCNC with MotionGroup hardware. One of the quirks of this setup is its phase drive.
Basically the way I' reading the existing TURBOCNC parameters the 2 pins going to any motor needs to fire in this order 1,1-1,0-0,0-0,1 Using stepgen parameter 5 has gotten me the smoothest(nearly acceptable) results. In forward the motor runs rather notchy but in reverse its very smooth.
But as you can see in the attached HAL I am only using phases A and B. If I could tie a certain phase to both pins so that both fired I think this would do what I need.
Can anyone give some pointers on what to try next?
I am converting a system that ran on TURBOCNC with MotionGroup hardware. One of the quirks of this setup is its phase drive.
Basically the way I' reading the existing TURBOCNC parameters the 2 pins going to any motor needs to fire in this order 1,1-1,0-0,0-0,1 Using stepgen parameter 5 has gotten me the smoothest(nearly acceptable) results. In forward the motor runs rather notchy but in reverse its very smooth.
But as you can see in the attached HAL I am only using phases A and B. If I could tie a certain phase to both pins so that both fired I think this would do what I need.
Can anyone give some pointers on what to try next?
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Last edit: 06 Apr 2024 16:51 by D-wilson357.
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06 Apr 2024 18:28 #297703
by D-wilson357
Replied by D-wilson357 on topic Phase Drive Questions
This group of code is basically what I'm trying to do
However when it gets to xpina<=xphaseA xphase B HAL debugger says Xphasea is not a pin
net xpina => parport.0.pin-02-out
net xpinb => parport.0.pin-04-out
net xphaseA <= stepgen.0.phase-A
net xphaseB <= stepgen.0.phase-B
net xphaseC <= stepgen.0.phase-C
net xphaseD <= stepgen.0.phase-D
net xpina <= xphaseA xphaseB
net xpinb <= xphaseA xphaseD
However when it gets to xpina<=xphaseA xphase B HAL debugger says Xphasea is not a pin
net xpina => parport.0.pin-02-out
net xpinb => parport.0.pin-04-out
net xphaseA <= stepgen.0.phase-A
net xphaseB <= stepgen.0.phase-B
net xphaseC <= stepgen.0.phase-C
net xphaseD <= stepgen.0.phase-D
net xpina <= xphaseA xphaseB
net xpinb <= xphaseA xphaseD
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06 Apr 2024 18:43 #297704
by PCW
Replied by PCW on topic Phase Drive Questions
The pattern you listed is quadrature so setting the
step type to 2 (quadrature) and these connections
should be correct:
net xpina parport.0.pin-02-out <= stepgen.0.phase-A
net xpinb parport.0.pin-04-out <= stepgen.0.phase-B
step type to 2 (quadrature) and these connections
should be correct:
net xpina parport.0.pin-02-out <= stepgen.0.phase-A
net xpinb parport.0.pin-04-out <= stepgen.0.phase-B
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06 Apr 2024 18:47 #297705
by tommylight
Replied by tommylight on topic Phase Drive Questions
This
Xphasea
is not the same as this
xphaseA
Linux, mind the caps.
The only thing i can see on the hal file that is not correct is stepgen type 5 for X axis but only 2 phases used, so that will not work or will work very harshly and with no torque.
For two phases, stepgen type 2 should work, as is the rest of your config, so do the rest work?
Xphasea
is not the same as this
xphaseA
Linux, mind the caps.
The only thing i can see on the hal file that is not correct is stepgen type 5 for X axis but only 2 phases used, so that will not work or will work very harshly and with no torque.
For two phases, stepgen type 2 should work, as is the rest of your config, so do the rest work?
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06 Apr 2024 19:03 - 06 Apr 2024 19:05 #297706
by D-wilson357
Replied by D-wilson357 on topic Phase Drive Questions
Thanks for the replies.
I only have one motor setup currently on a bench test rig so for all intents and purpose the other 3 don't exist.
I arrived at STEPGEN 5 because it was the smoothest in reverse.
If STEPGEN 2 is the correct output that matches the TURBOCNC parameters(which works well), that works for me. I just found myself second guessing the setup based on the STEPGEN diagrams not showing a "dead space" in signals. I believe the Motion Group box does some processing of the signal but I could be wrong on that.
Heres a video of the stepper running in Jog mode.
I only have one motor setup currently on a bench test rig so for all intents and purpose the other 3 don't exist.
I arrived at STEPGEN 5 because it was the smoothest in reverse.
If STEPGEN 2 is the correct output that matches the TURBOCNC parameters(which works well), that works for me. I just found myself second guessing the setup based on the STEPGEN diagrams not showing a "dead space" in signals. I believe the Motion Group box does some processing of the signal but I could be wrong on that.
Heres a video of the stepper running in Jog mode.
Last edit: 06 Apr 2024 19:05 by D-wilson357.
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06 Apr 2024 19:25 #297708
by tommylight
Replied by tommylight on topic Phase Drive Questions
That looks more like motor miss wiring, is that a unipolar or bipolar motor and how many motor wires connect to driver/control box?
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06 Apr 2024 19:34 - 07 Apr 2024 01:25 #297710
by D-wilson357
Replied by D-wilson357 on topic Phase Drive Questions
I believe the motors are 8 wire(to 4 pins)
rlkey=juwhpldi4pf5wihsfmique97f&dl=
unipolar. www.pikpower.com/documents/SST83DSERIES.pdf
rlkey=juwhpldi4pf5wihsfmique97f&dl=
unipolar. www.pikpower.com/documents/SST83DSERIES.pdf
Warning: Spoiler!
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Last edit: 07 Apr 2024 01:25 by D-wilson357.
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06 Apr 2024 19:40 - 07 Apr 2024 01:24 #297711
by D-wilson357
You can see here the turbocnc parameters that work. Pins being switched on a 2 and 4. So phase 1 hits both. Phase 2 hits pin 2. Phase 3 hits none. Phase 4 hits pin 4.
Replied by D-wilson357 on topic Phase Drive Questions
You can see here the turbocnc parameters that work. Pins being switched on a 2 and 4. So phase 1 hits both. Phase 2 hits pin 2. Phase 3 hits none. Phase 4 hits pin 4.
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Last edit: 07 Apr 2024 01:24 by D-wilson357.
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07 Apr 2024 00:19 #297728
by tommylight
Replied by tommylight on topic Phase Drive Questions
Please upload pictures here on the forum, your first dropbox link insist i register to view, the second gave me two warnings about cross site scripting attacks on my PC. I really do not like drops#it rummaging through my PC.
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LinuxCNC can do stepgen types 5, 6, 7, 8, 9, and 10, all for 2 phase stepper motors, what you describe seems like type 8, not 5, so just edit the stepgen type, save and test.
From past experience, the most speed with good torque i got from 6 and 7, most torque from 10 but some stepper/drive combos really do not like it.
But, first, make sure the wiring is correct, no amount of software will help with a unipolar motor wired to a bipolar drive or vice versa.
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LinuxCNC can do stepgen types 5, 6, 7, 8, 9, and 10, all for 2 phase stepper motors, what you describe seems like type 8, not 5, so just edit the stepgen type, save and test.
From past experience, the most speed with good torque i got from 6 and 7, most torque from 10 but some stepper/drive combos really do not like it.
But, first, make sure the wiring is correct, no amount of software will help with a unipolar motor wired to a bipolar drive or vice versa.
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07 Apr 2024 00:52 #297731
by PCW
Replied by PCW on topic Phase Drive Questions
If you only have 2 output pins, and the drive is not step/dir
or CW/CCW, mode 2 is the only mode that makes sense...
or CW/CCW, mode 2 is the only mode that makes sense...
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