Anyone else using these? I see the person who did the kickstarter for a PCB and a library has moved to using grey market driver ICs and no longer does anything with the library. I (meaning we at OlyMEGA's Arduino night) had problems with his X25 library. Chatter, backwards motion, skipping, slipping…

We're flooded with work right now, so it may be a few weeks. Feel free to poke me in three or four weeks if I've not posted by then.

I just wondered if there has been any opportunity to move this forward?

Thank you for poking me about this. I've had major changes at work that took my time and attention away from this. I intend on getting together with my friend again soon to keep working on this.

@polymorph please do, when you get the time; I would love to use these motors in a project or two but have suffered similar problems (chatter, backwards motion, etc) and don't (yet) possess the know-how to tweak AccelStepper for these things, what with the 3-phase pattern. :sweat_smile:

polymorph: the special 6 step pattern that is in the datasheet for the X27.168. That '6 step pattern' is called half-stepping. It is not a three phase motor, it is a standard two phase stepper motor. The basic idea of half-stepping is that you alternate two coils on / one coil on. This doubles …

Isn't half-stepping a "regular" 4 step motor, an 8 step process? [image] [image]

The gauge stepper drive pattern is clearly half step, two phase, but with six states instead of the usual eight. Both coils are on in only two of the six states, whereas with the 8 state drive pattern, both coils are on in four of the states. It isn't clear why the manufacturer chose this particula…

I looked at that datasheet closely and then the response above popped up. [image] Yes, it is an oddball pattern, not quite half-stepping. AB A /B /A/B /A B AB Half-stepping would be more like: A AB B /AB /A /A/B /B A/B A According to the datasheet, it is "Lavet-type" motor. [image] …

According to the Wikipedia page, the Lavet-type is single phase, with a single coil, and three drive states. One is a null state when the coil is not energized. It is unidirectional in motion, probably because of the cogging in the null state. In the six-state pattern published by the gauge motor m…

Physically, it looks a bit like a 3 phase motor with one stator missing. I opened one up and took a picture sometime last year, but don't know where I put the picture. It has two windings, and the pole piece comes in about 120 degrees from each other. I don't remember if I discovered the rotor had …

X27.168 gauge stepper motor library

Other Hardware Motors, Mechanics, Power and CNC

polymorph February 14, 2019, 8:21pm 15

Isn't half-stepping a "regular" 4 step motor, an 8 step process?

Small lightweight stepper motor and trying to find "home"

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X27.168 gauge stepper motor library

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