Sensorless Sync Issues (was Phase Combinations, Aotema)

[o00scorpion00o]

Ahh, Nice that you found your fix to your throttle Scorpion.

Cheers, yeah was driving me crazy that's for sure!

The controller has me puzzled now though, after modding it and soldering the shunt you would think that it could no longer limit you to around 3kw ?

I might E-mail lyen and ask him.

But all I can say is the acceleration at about 4kw on 24S is really addictive, until that is, the vibration starts, but when you back off the throttle and increase it again slower, rather than hit it wot from start, you can feel the surge of power.

But what I think would be needed is for starters more ah or nanotech, and an 18fet, would probably do the job.

Only thing is while the sheer torque at 5kw is brutal, on 16S, I need it for the woods, I wouldn't be able to climb 30% grades at with only 35 amps, instead of 80!

a 24 fet controller would be needed for such power levels 90 volts x 80 amps would be 7200 watts, I doubt the pie could take that continuously, however it's only the woods that would take it to the limits, and the hills are not too long so probably wouldn't matter.

I would like to take it up the 16% mountain that killed my halls, maybe the higher voltage would be better and not allow it to bog down as much ?

Maybe I will test it, but would need more ah.

[Beachcruzer]

Success! With some input from Lyen I think I've finally got this thing tuned properly.

First, I programmed the controller for 30 amps rated/50 amps phase, as Lyen suggested. That should have reined the power output back to the low-2000 watt range, but it had little discernible effect--the controller was still pumping around 5000 watts at WOT (72 volt lipo pack), efficiency was 107 wh/mile, and it was losing sync at high speed.

Then Lyen told me to change the RShunt value in my Cycle Analyst from 1 mOhm to 2 mOhm, and amp limit from 80 to 100. (It doesn't go up to 100, so I set to 99). I did that, and the controller magically calmed down. Peak wattage is a more reasonable 2,500 or so, efficiency is 45 wh/mile, and no sync issues. Wound up to 40 mph with no problems.

I have zero clue why the controller didn't function as programmed until the CA was set properly, but there you have it.

[o00scorpion00o]

Success! With some input from Lyen I think I've finally got this thing tuned properly.

First, I programmed the controller for 30 amps rated/50 amps phase, as Lyen suggested. That should have reined the power output back to the low-2000 watt range, but it had little discernible effect--the controller was still pumping around 5000 watts at WOT (72 volt lipo pack), efficiency was 107 wh/mile, and it was losing sync at high speed.

Then Lyen told me to change the RShunt value in my Cycle Analyst from 1 mOhm to 2 mOhm, and amp limit from 80 to 100. (It doesn't go up to 100, so I set to 99). I did that, and the controller magically calmed down. Peak wattage is a more reasonable 2,500 or so, efficiency is 45 wh/mile, and no sync issues. Wound up to 40 mph with no problems.

I have zero clue why the controller didn't function as programmed until the CA was set properly, but there you have it.

Glad you got it sorted!

Do you have a program cable for the controller ? It would be very helpful for me if you could program your controller for 44 amps, at 72 volts you should be pulling about 3000 watts. I would be very curious if you have the noise and vibration I get at around 3kw!

If you don't feel comfortable doing that then that's o.k.

You should get a magic pie for 40 mph, it's got super torque and would probably stay a lot cooler than the 9C!

[Beachcruzer]

Yes now that it's working by dialing back the current I'm going to slowly increase the current to basically get it to the bleeding edge of power before it de-syncs. I'll try your suggested numbers next and let you know how it works out.

Test rode the 2810 9c yesterday on another ES members bike. Was very impressed with torque and hill climbing. Top speed is a little less but I think I'm sold. Maybe I need to ride a pie with external controller to get a good comparison.

[snellemin]

With my heavy bike, I'm still able to lift the front wheel a bit, when I'm not careful with the throttle and Magic Pie.

[feyris]

Success! With some input from Lyen I think I've finally got this thing tuned properly.

First, I programmed the controller for 30 amps rated/50 amps phase, as Lyen suggested. That should have reined the power output back to the low-2000 watt range, but it had little discernible effect--the controller was still pumping around 5000 watts at WOT (72 volt lipo pack), efficiency was 107 wh/mile, and it was losing sync at high speed.

Then Lyen told me to change the RShunt value in my Cycle Analyst from 1 mOhm to 2 mOhm, and amp limit from 80 to 100. (It doesn't go up to 100, so I set to 99). I did that, and the controller magically calmed down. Peak wattage is a more reasonable 2,500 or so, efficiency is 45 wh/mile, and no sync issues. Wound up to 40 mph with no problems.

I have zero clue why the controller didn't function as programmed until the CA was set properly, but there you have it.

Good news!
I have the same problem, but I don't have a cyclanalyst.
I will try to change the amps value on my controller, I'm waiting a new usb uart (burned the last one lol)

[o00scorpion00o]

The only way I can stop the mad vibration is to turn the amps down and that doesn't suit me at all.

snellemin has the same setup and has no issues, so unless overheating the motor had something to do with it I have no idea. I've no other Pie to test!

The more I turn up the amps the worse it gets, I've stand alone cycle analyst so that isn't an issue for me.

I want my mac back!

[o00scorpion00o]

OK update......................

Since going back to 16S LiPo from 24S and playing with the software again. I no longer have the vibration!

I can wot as much as I want pulling 83 amps from still.

I've no idea why it's working now. Unless I got lucky and got the right battery and phase combo ?


Weird!

[o00scorpion00o]

Spoke too soon, vibration back,

reduced phase current, not as bad!