Gmac 10t and phaserunner weird noises

[Iceman]

My bike started acting weird yesterday, now there is no power on the wheel but very strange sound. Sounds like the motor is spinning inside but no power on the wheel.

Any ideas?
Is there a way to post videos?
Here is a db link of a video:

IMG_6856.MOV

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[Iceman]

Hello, some time has passed and I have been riding another ebike but was realy missing my own build.

Finally got around to exchange the motor cable, the gears and the hall Sensor platine.

After closing up, all was fine and the bike worked like a charm for about 1 hour. Then after a short break it started to allways lose power, so it would accelerate a little, lose power, accelerate a bit and so on.

Hooked my new phaserunner up to pc but no error message. Has anyone experienced this?

I have ordered a new Gmac (probably what I should have done from the beginning) but of course after all this trouble and learning allot about mechanics and soldering I would be very happy to get it rolling and to use it on a backup build.

 

[neptronix]

Sounds like dead halls.
Lucky for you, the phaserunner has a sensorless mode and it's fairly decent - not sure how well it works on hubs.

How bad were the gears? i'm thinking you overheated the motor.. and cooked the halls.. or there's a hall wiring fault.. that will cause a phaserunner to act quite intermittently..

 

[Iceman]

The gears were toast and scrambled all over the place.. after scraping them out and installing the new ones it was rolling smooth for a bit…

I hooked it up today and got a hall sensor error (I replaced the whole chip) error in pic attached.

I set it to sensorless mode but got the same jerky on and off when hitting the throttle. After trying around a bit the motor was no recognized anymore and didn’t work at all.


Yes we are all agree that you shouldn’t taxi 2 girls and my fat ass from festival to camping… what can I say…

It all looked pretty good when I put it together, and I tryed to get all cables super tightened with cable thies, but my feeling is telling me something stood out too far and might have scraped…
Unfortunately I didn’t make any pictures as I was sure it was going to work now.

It might be toast but I will open it up again next week and have a look. Hopefully just some cables scraped…

Cheers

 

[Iceman]

Here is the other thread explaining more of the history of this dilemma:

Gmac 10T and Frankenrunner problem

Hi Guys, Looking for help with my bike. When I connect my Lipo batterys and pull the throtle it will stutter at first but then run normally.. untill I let go of the throtle. then no power until I reconnect the batterys on my way home. now when I connect it there is nothing happening only the...

endless-sphere.com

 

[neptronix]

I recommend disconnecting the hall sensor cable and making sure it runs as full sensorless.
Make sure you run an auto detection first.

Yes we are all agree that you shouldn’t taxi 2 girls and my fat ass from festival to camping… what can I say…

Hope you had a good time at least!

 

[neptronix]

Stutter is a different issue...

TBH the phaserunner isn't good at running the MAC at high speeds and requires tuning and living with some imperfection in how it's driven.

I would bet you a VESC would work very well.. sensorless is really good on a VESC, and a VESC can handle insanely high RPM motors.

 

[Iceman]

I recommend disconnecting the hall sensor cable and making sure it runs as full sensorless.
Make sure you run an auto detection first.



Hope you had a good time at least!

Yes must be some short there. I stoped for now in fear of cooking the controller…. Ah fu** me
But riding a factory fully with bosh motor at 25kmh felt even worse!

 

[neptronix]

Yeah i'd say you're in trouble if even sensorless mode doesn't chug/stutter a bit then run.

 

[neptronix]

Do the windings look cooked?

 

[Iceman]

Jup that’s what I thought… and ordered a ne gmac. But after opening the damn thing up 3 times it’s very hard to quit and give up

 

[Iceman]

Do the windings look cooked?

Yes that’s another problem.. I scratched the windings pulling in the new cable. My friend told me those were somehow insulated