Recent content by mazzola

@asa have you fit the QS273 motor to your bike yet? I was wondering if the axle fit into the dropouts/swingarm just fine or if you had to do some modifications.

I forgot to mention that a key switch is also included in the kit! Shown here above the electronic accelerator, which connects to a standard throttle cable.

The controller that came with my kit (which I'm selling) is pretty beefy. 150A continuous and 400A max phase current

New, never used conversion kit with 4 speed gearboxed motor, controller, and accelerator from Foshan Uni Tech. Originally bought a kit from Alibaba (see similar listing for specs). Asking $500, shipping included, which will get to your door way faster than the 6+ weeks from China. I'm willing to...

I'm thinking of building a 20s7p configuration using LG INR21700-M50L 4800mAh 21700 li-ion cells - so 84v max and 33.6Ah running at 100A peak. I'm also going to be looking at impact and vibration tests that are a part of the UL spec to inform my battery pack design, but my main concern for this...

Ah yeah, as long as there's not a fault in the enclosure, the circuit between one test probe and the other remains open and no current flows - so no damage and no over-charging of the cells. Is there somehow a way to test a one-off DIY pack in a non-destructive way in case it fails? Or at...

I've been reading UL 2271's standards for battery safety but am having trouble understanding how the "Dielectric Voltage Withstand Test"/Hipot would work. The test is meant to ensure the battery has sufficient insulation between its enclosure and the high voltage circuits within. But I don't...

Yeah the twisting motion is definitely an issue and solved with torque arms like you said. I was more concerned about the translational motion that I'm imagining happens whenever the vehicle accelerates and decelerates due to inertia. For example, when the vehicle is at rest and the rear wheel...

I reached out to Grin but have yet to hear back from their engineering team. But I figured out that the phase wires on the all axle are most likely 12ga based on this motor cable that they sell. So 300amps (even the 200A that are actually needed to get 4.92mph/s) seems like it might be pushing...

Okay, so similar to a bicycle wheel, it's the tension created by pinching the dropout faces against the axle flats. I wasn't sure if that tension would be enough for more powerful applications like an e-motorcycle. Let me know if this hand-wavy physics makes sense or if I'm missing something...

For hub motors that don't have any chain attached to it, what prevents the axle from slipping out the back or forward whenever the bike accelerates? Looking at other builds it seems like slippage is possible. Is it just the pinching of the axle by the swingarm/axle bolt that prevents slippage in...

Nice, yeah I'd want to use a cotter pin just like my CB550 stock axle did to prevent loosening. I'm thinking of using regen for rear wheel breaking as well - it seems like it would do just as good of a job as the old drum brakes (without the maintenance) and also like you said, braking power...

Ah, but I'm just realizing that if the Grin doesn't have enough acceleration, then I just need to increase the phase amps from the controller. So if I run the simulator using a 300A controller like the makerX GO-FOC G300 then I get an average of 4.92 mph/s for a 0-20mph in just over 4s which...

How are you figuring out the acceleration with the motor simulator? I've never done it before but what made sense to me was to try and sample it once per second by taking the initial speed and acceleration (e.g. 0mph and 3.26 mph/s) and then getting the next acceleration measurement at the new...

Nice! Did you have to modify your swingarm at all to fit the QS motor? And how was the process of swapping out the rear drum brake for a disc brake?