Neco MM18 Lingbei mid drive

WeBasic

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Posting this here because I couldn't find any info on these mid drives. I'm trying to figure out how to add a throttle. They had a concept bike built with one

neco website
 

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Something is wrong with the torque sensors in these motors. The harder you apply pressure to the crank the motor decreases in power. While a very minimal pedal speed / power will give full power on PAS. This problem has been mentioned by two other owners of the Neco MM18. So it's not a fluke.

Neco has been unwilling to help through their e-mail so far.
 
The controller is probably programmed for a different sensor than they actually used, so that the sensor changes output voltage in the opposite direction than the controller expects.

If that's the case, maybe you could build a small inverting op-amp circuit
between the sensor signal output and the controller input.
 
I’m having the same issue with the same bike. Mine was working but has stopped and is cutting power with pressure. If you have found a fix I’d love to know. I’m goin to tear into mine soon and see what I can figure out. Maybe the sensor is bad or something, might try to disable because at least it would stop cut out after cadence starts. If I figure anything out I’ll report back. Best of luck.
 
I’m having the same issue with the same bike. Mine was working but has stopped and is cutting power with pressure. If you have found a fix I’d love to know. I’m goin to tear into mine soon and see what I can figure out. Maybe the sensor is bad or something, might try to disable because at least it would stop cut out after cadence starts. If I figure anything out I’ll report back. Best of luck.
I did reach out to Lingbei through email and they offered to send replacement parts. I just haven't had time to dig into the motor to diagnose. My guess would be the tourq sensor.

They might use a flat piece of spring steel on the crank that breaks allowing the sensor to max out with little effort. At least that's the problem they had with their bolt on motors. Take photos when your in there! It's a mystery at the moment
 
I did reach out to Lingbei through email and they offered to send replacement parts. I just haven't had time to dig into the motor to diagnose. My guess would be the tourq sensor.

They might use a flat piece of spring steel on the crank that breaks allowing the sensor to max out with little effort. At least that's the problem they had with their bolt on motors. Take photos when your in there! It's a mystery at the moment
Interesting, yeah I’ll see what I can find… don’t have much faith that I’ll find a solution but I won’t know till I try.
 
IMG_2371.jpegIMG_2375.jpegWell I took it apart and basically cleaned the cadence/torque shaft up a bit. I did notice a little metal filings on the magnet that might be throwing off the sensor. Put it back together and it seems to work a little better but if you still full press the pedals hard it will cut out. Before basically any press and it would cut now it seems i can apply a bit and still will assist. Which isn’t ideal but maybe its supposed to so it don’t over torque the chain. But still seems odd. I’m wondering if maybe I could adjust the sensor a bit and get and difference in result but for now I’ll just use as is sense it doesn’t seem as bad. Also if you can out to clean make sure you put the big black gear onto the shaft first because there’s spring loaded wings that need to be in the gear. Otherwise wasn’t too bad to do.
 
View attachment 353527View attachment 353528Well I took it apart and basically cleaned the cadence/torque shaft up a bit. I did notice a little metal filings on the magnet that might be throwing off the sensor. Put it back together and it seems to work a little better but if you still full press the pedals hard it will cut out. Before basically any press and it would cut now it seems i can apply a bit and still will assist. Which isn’t ideal but maybe its supposed to so it don’t over torque the chain. But still seems odd. I’m wondering if maybe I could adjust the sensor a bit and get and difference in result but for now I’ll just use as is sense it doesn’t seem as bad. Also if you can out to clean make sure you put the big black gear onto the shaft first because there’s spring loaded wings that need to be in the gear. Otherwise wasn’t too bad to do.
Thank you for the photos. It looks less complicated than I was imagining. Did you get any photos of the crank where it indexes with the Hal sensor (bolted to the case next to the reduction gear)?
 
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Thank you for the photos. It looks less complicated than I was imagining. Did you get any photos of the crank where it indexes with the Hal sensor (bolted to the case next to the reduction gear)?
No sorry I didn’t think about it till I had it back together. It’s just seems like a solid shaft with magnets i believe around it. just slips right out. If I take apart again I’ll do that.
 
Hey guys, wondering if you'd had any luck dealing with Neco or Lingbei. I also bought the Hurley Riptide and had some issues pretty early on. Turns out the planetary gears got extremely stripped and I can't find replacements anywhere. Seems the whole Bible is kinda SOL since the frame is built around this motor and I can't find the replacement pieces.
 

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Hey guys, wondering if you'd had any luck dealing with Neco or Lingbei. I also bought the Hurley Riptide and had some issues pretty early on. Turns out the planetary gears got extremely stripped and I can't find replacements anywhere. Seems the whole Bible is kinda SOL since the frame is built around this motor and I can't find the replacement pieces.

Bypass Neco and contact Rex Chen (chenhualingbei@163.com) at Lingbei. Please be very kind and greatful to Rex as I get the impression he is going above and beyond to help us. Which is very rare! Let us know what you find.

Worst case those nylon gears look very 3D printable :)
 
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