Running Etek CCW
I think the etek was meant to run CW as there is a squealing sound when I run it in the other direction that comes from the brushes.
I think I messed with the timing and didn't get it back to neutral a while back, but I did a no-load test anyway:
CW @ 12v: 3.0 amps
CCW @ 12v: 3.10 amps
I heard of someone smoking a PMG 132 motor running it CCW here, so that got me a little worried. I talked to Brian at thunderstruck-ev.com, and he said that someone in Australia was running two eteks horizontally opposed in a car and one kept smoking. It was the one that was being run CCW. That got me a bit more worried. He also said that the brushes are going to wear a lot faster.
I think I can keep the current to each motor equal by advancing the timing on the CW motor if the CCW motor at neutral timing just happens to be drawing more current.
Anyone have any experience with this, or ideas/comments?
I remember something similar with an etek turning the wrong direction in the old forums and cant remember how it was fixed and who it was. I dont remember if the guy had to turn it back in to get the correct direction or was able to change the direction of the brushes. Unfortunately, I do not have my etek available with me to look at this time to check the brushes. Maybe Badfishracing has some advice on this.
Some adjustment of the timing would be needed to reverse the direction. I'm not sure if the slots have enough adjustment range to get it dialed in for reverse. If you run the motor slow (12v) and measure the no load current, adjust the brushes until the current is minumum. This will be very close to where you want to be. It might be necessary to elongate the holes to get enough adjustment.
Remember, you're trying to change the position of the brushes with respect to the magnets to change the timing.
If the motor is reversed, the brushes will need to "break in" in the reverse direction. This can be done by running the motor for a few hours at low speed. Avoid high current operation until the brushes are fully seated in the new direction.
OK, now I remember.
Anyway, you want to try and keep both magnet rings lined up with each other (move both of them the same amount).
To advance the timing, the magnets would need to rotate in the same direction as the shaft.
Your currrent measurements indicate the timing was pretty close to neutral. At neutral, the forward and reverse current will be equal. Since the Etek has such a low inductance, you don't need too much advance. I'm not really sure what optimal is, but in general, neutral is best at low RPM and more advance is best for higher RPM.