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Simple way(s) to run a bipolar stepper motor?
sorveltaja:
I've been looking ways to make something that produces 'quadrature' wave forms. Not 'quadrant', a term that I mistakenly used.
There are some schematics online, of how to use a D flip flop to make waves, that are 90 degrees apart, but although I have 4013's and 4049's, I just can't figure out how to get desired output.
When testing, they(4013's) give only 'flip', and therefore they flop(pun intended).
Anyway, there seems to be at least one other way to get quadrature waveforms.
In this case, it takes two 4017's (Decade counters, and a generator to run them), and four 1K resistors:
philf:
sorveltaja- How do you provide the 4 outputs for a stepper motor? - Phil
sorveltaja:
The setup that I'm testing, uses two 4017's that are fed to two 386's. It's just two stepper wires connected to ground, and two other are connected to signal outputs. I've noticed that this circuit has a serious drawback: sometimes the stepper starts to rotate in opposite direction than previously, although I didn't change its wiring, or anything in the circuit.
philf:
--- Quote from: sorveltaja on August 25, 2023, 03:06:34 PM ---The setup that I'm testing, uses two 4017's that are fed to two 386's. It's just two stepper wires connected to ground, and two other are connected to signal outputs. I've noticed that this circuit has a serious drawback: sometimes the stepper starts to rotate in opposite direction than previously, although I didn't change its wiring, or anything in the circuit.
--- End quote ---
What waveform(s) do the coils see?
An awful lot of trouble to spin a stepper when you can buy 5 driver boards off eBay for £7.90: eBay item number:203578822101
Phil.
sorveltaja:
--- Quote from: philf on August 26, 2023, 12:46:59 PM ---
--- Quote from: sorveltaja on August 25, 2023, 03:06:34 PM ---The setup that I'm testing, uses two 4017's that are fed to two 386's. It's just two stepper wires connected to ground, and two other are connected to signal outputs. I've noticed that this circuit has a serious drawback: sometimes the stepper starts to rotate in opposite direction than previously, although I didn't change its wiring, or anything in the circuit.
What waveform(s) do the coils see?
An awful lot of trouble to spin a stepper when you can buy 5 driver boards off eBay for £7.90: eBay item number:203578822101
Phil.
--- End quote ---
The waveforms are rather distorted, although there are some faint(perhaps imaginary) remnants of waves 90 degrees apart. I should have taken scope screenshots of how crappy they are.
But I already removed involved components to test another setup(one can never have too many breadboards). Reason that I use infamous 386's instead of power transistors, is that they can take a lot of abuse without burning out(unless intentional or mistake). It's like a sort of first step to using more current, than I've used in any of previous projects.
So I guess one thing is the current demand of low ohm coils, that distorts the signal of already mis-used 386's. I have to admit, that it's quite steep learning curve for me.
I have some power transistors, but as they require proper setup/circuit (to not use them simply as heating elements), I'll save them for later use, if I get some sense about that current stuff.
Phil, I appreciate your view, and yeah I know that it's a lot of trouble, but I just have this need to re-invent the wheel, and to show others, who might be looking for 'simple ways' to drive/run a stepper, of what kind of problems newbie(like me) might face, while at it :beer:
--- End quote ---
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