#788 Four Wire Stepper Motor (part 1 of 2)

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Episode 788
I have a motor that turns out to be a 4 wire stepper more. Let's see what it takes to control this motor. I use two H-bridges and generate the step pattern with a GAL and 555.
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Nice. I like that the TA8080k has internal diodes, unlike some h-bridges like the L289n.

Enigma

Those things take very little current to drive. I used to simulate H-bridge action by direct connection to the MCU pins and it worked well.

AlexTaradov

Your mini projects are always really fun to watch. Thanks for posting!

oriole

Those little Toshiba 8080 motor driver ICs are really neat. I'm thinking an arduino with two micro switches to inhibit motor rotation at each end of that tiny linear actuator would wrap up this project quite nicely. Nice improvisation using the GAL IMSAI Guy! Fred

electronicengineer

You should buy a few of those easy drivers. They work great

markgreco

Nice linear actuator! If the motor current is less than 20mA then a ATmega328 (aka Arduino) can drive it directly without drivers. Atmega can source and sink 20mA.

technofundave

I was going to ask about the 45 degree option. Nice little motor, A bit fiddly though. :)

frankowalker

Thanks for putting out videos at such a diligent pace. I am in the hospital with another collapsed lung, and I look forward to your videos. Thank you.

I suspect that you are might make a more manual way to step the drivers in the future, but the A4988 and DRV8825, and the newer class drivers are handy and quite popular. Though, I found that the A4988's whine a bit with low-mass motors. Although it doesn't increase accuracy, the A4988s and the like have from 16-128 microsteps.

That's a really cute little axis! Hall effect sensors such the the honeywell ones and a tiny magnet makes good limit switches. Hmm. I suspect that your electrometer can even measure the Hall effect. Just a bit of bismuth makes the Hall sensor....

Oddly, because the CD axis has nylon gear teeth that wedge, they have little backlash. Microstepped motors get pretty warm. A heatsink helps.

I have some ultrasonic silent-wave motors. Because of real-life stuff, I don't know of a decent way to drive them. If I get an amplifier on the function generator, that should work. The amp needs to be pretty stout because it's a capacitive load.

As for ultrasonic, ultrasonic actuators and flextures is where I want to be heading.

BrendaEM

If you put 2 anti-parallel diodes in series with each winding, would that not practically eliminate any overvoltage concerns?

flemmingjacobsen

#788 Four Wire Stepper Motor (part 1 of 2)

#788 Four Wire Stepper Motor (part 1 of 2)

#789 Four Wire Stepper Motor (part 2 of 2)

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