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2022-04-03 12:44 am
@clark77494 That doesn't look healthy at all to me, but I am certainly no expert. That looks like it's stalled perhaps.
Think of it like a hammer striking a nail. Both the hammer and the nail vibrate afterwards because neither is a perfect solid and a shock wave is induced in both by the transfer of energy between then.
Anything seems possible when you don't know what you're talking about.
Clark77494 reacted
2022-04-03 12:48 am
@will I wonder if the acceleration model you spoke of will vary the amplitude causing the magnetic field to expand faster in the same time.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
Clark77494 reacted
2022-04-03 12:49 am
@will I believe in a motor scenario it's called the counter-emf.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2022-04-03 12:50 am
@will I wonder if the acceleration model you spoke of will vary the amplitude causing the magnetic field to expand faster in the same time.
Beyond my area of understanding, amplitude of what ?
Anything seems possible when you don't know what you're talking about.
2022-04-03 12:52 am
@will Amplitude of the waveform on the scope which I assume is the voltage.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2022-04-03 12:52 am
@will I believe in a motor scenario it's called the counter-emf.
Indeed, that's what causes the nasty spikes on the voltage in the scope photo you didn't like 🙂
Anything seems possible when you don't know what you're talking about.
2022-04-03 12:53 am
@will I bet that motor was hardly moving.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2022-04-03 12:56 am
@will Amplitude of the waveform on the scope which I assume is the voltage.
OK, that amplitude has a base which is the applied voltage which should always be the same (I think, I don't know if stepper drivers fiddle with the voltage supplied to the stepper). The peaks and valleys overlaid on that is the result of the rapidly changing magnetic field as the motor resists the change in speed.
DaveE could probably explain it better than me 🙂
Anything seems possible when you don't know what you're talking about.
2022-04-03 12:58 am
@will I bet that motor was hardly moving.
I'd expect it to be doing a reasonable speed. Clark said it was under load. If it were not moving there would be much less backlash and I would have expected the plot to have been less "angry" 🙂
Anything seems possible when you don't know what you're talking about.
2022-04-03 1:00 am
@will I was referring to the original square wave pattern which looks the same as the pico PWM pattern. The fuzzy pattern is under load with too much friction. But as I said, I have forgotten more about this stuff that I care to think about.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2022-04-03 1:01 am
@will Possibly, there are too many unknowns to make even a semi-educated guess.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2022-04-03 1:11 am
@will Possibly, there are too many unknowns to make even a semi-educated guess.
Even one unknown is enough to stymie me 🙂
Anything seems possible when you don't know what you're talking about.
Topic starter
2022-04-03 1:15 am
@zander I am surprised that the feedback did not fry the Arduino. I am go to try using a DM542 Motor driver and see how it handles the motor. The DM542 does not have a feedback encoder however.
It's great to tip your server unless you work in the Server Room!
Topic starter
2022-04-03 3:54 am
@zander I am not sure if the Raspberry Pi Pico is going to work. The Pico is 3.3 volt logic and the CL86T Stepper Controller is 5 volt logic. I guess I can use some pullup transistors. Do you know what that pullup circuit is called so I can look it up?
It's great to tip your server unless you work in the Server Room!
2022-04-03 4:01 am
This will get you started on the transistor end of it ...
https://learn.sparkfun.com/tutorials/transistors/applications-i-switches
You can also get voltage converters to do the 3.3V <-> 5V changing for you, for example ...
https://www.sparkfun.com/products/12009
Or you can check out Amazon, search for "logic level converter b-directional"
Anything seems possible when you don't know what you're talking about.
Ron and Clark77494 reacted