Two Stepper Motor Questions...

[alank2]

Hi,

I ordered some of the 381oz stepper motors from Keling along with a G540.

The motor sheet says A+, A-, B+, and B- which I am assuming goes with the G540's A, /A, B, /B respectively. Their docs say that you can swap A and A/ if you don't get the correct direction which makes sense, but couldn't you also swap the A set and B set to do the same thing as long as the swap was A-B and A/-B/?

Second question has to do with the trim adjustment for motor smoothness? What exactly does this tweak? What does it sound like when adjusted and not adjusted properly?

Thanks,

Alan

[MoneyPit*10]

Just a guess.

If one coil is inverted in relation to the other, the motor will buzz and not move.

So if the direction of rotation is wrong you invert both A/A- and B/B-.

As to the other question, I do not own a G540 so i will keep quiet and read.

MP*10

[ger21]

but couldn't you also swap the A set and B set to do the same thing as long as the swap was A-B and A/-B/?

NO!
You can swap A and A-, or B and B-, but if you swap an A for a B, you'll kill most drives.

Second question has to do with the trim adjustment for motor smoothness? What exactly does this tweak?

I thought I read somewhere that it smooths the linearity of the motor??

[alank2]

Hi Gerry,

NO!
You can swap A and A-, or B and B-, but if you swap an A for a B, you'll kill most drives.

Sorry, I wasn't very clear in my example, I am not talking about swapping A for a B on its own which would lead to one winding on A and B. I was talking about swapping the entire windings with each other for example:

A and B swap
-AND-
A- and B- swap

Thanks,

Alan

[H500]

To put it another way, don't mix an A wire with a B wire or you will likely kill the drive.

The POT controls the cross-over distortion of the sine wave. Tweak it to get the least vibration at low speeds.