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    Experienced Battery Builders Help! - JBD smart BMS random voltage drop from 48v down to 15-17v

    The BMS is a JBD Universal Smart BMS type AP21S001 It can do both LFP and Li Ion and series connections between 6s and 20s Out of the blue, about a dozen times now it decides to stop working. The voltage at the connector ends drops to 15-17v while the pack voltage remains normal at around 50+...
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    Fiido Q1S 5kW dual motor: VESC + modular DIY OpenSource electronics and software

    Would you mind sharing the settings you used? I'm having an issue that apparently others are also having with this controller. that being acceleration and torque at the bottom 50 percent of the RPM band. I'm running 48v. Do you think that might be part of the issue, since the componentry is...
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    Flipsky 75100 - How to use with ebike BLDC

    Heatsinks, Heatsinks, Heatsinks. I used thermal glue to adhere mine to a big copper plate and then stuck a bunch of the tiny 20mX20m heatsinks with the adhesive backing all over it. especially on the side with the Mosfets. It heats up quick but stays under 60 degrees celsius no matter how hard I...
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    Flipsky 75100 sensor detection fail help

    I'll share my post, at the bottom you'll see the FOC settings that are working alright for me. No shuddering but it does struggle at lower RPMs and to get up and go on any kind of incline. -------------------------------- Anyone with any experience using VESC controllers with DD hub motors...
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    VESC Tuning Advice, Poor Acceleration compared to other controllers

    Anyone with any experience using VESC controllers with DD hub motors please advise! I am building a custom ebike with a 1500w direct drive hub motor. Before the flipsky 75100 that I am currently using, I had a Kelly KLS-S 48v controller on it. Specs on that were are sinewave FOC, 50amp cont...
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    Okay, this is more along the lines of what I was suspecting. Considering that I am running about 3x the power that the motors are rated for, my thoughts are that something inside the motor is shorting, and it may not be shorting all the time but something definitely doesn't seem right. I do plan...
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    I also don't believe that the issue is with the controller since I plugged it up to a second hub motor that I replaced the front wheel with and it ran perfectly, quieter than the hub on the rear.
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    I have checked and tuned the motor using the self learning feature and everything seemed fine. Under no load (spinning freely) the motor seems to be spinning fine with little to no noise. It is only when I start riding the bike that the problem becomes apparent.
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    That's possible. I believe the hall sensors and phase wires are in the correct combination, I always check to make sure that the colors of the wires are the same on both ends. I still seem to be able to pedal, or in this case use the throttle. What seems to happen though when I apply the...
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    Correct, it also seems to happen while the bike is parked, after I have spun the motor up a couple times for testing with practically no load. I'm not sure if the two issues are the same, all I can say is that the motor generates a ton of heat and doesn't really seem to start cooling down until...
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    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    I have noticed now after several ebike builds that if I tighten the axle nuts too aggressively then the hub motor seems to have trouble rotating as freely, draws more current, and sometimes even gets very hot while not in use. This seems to indicate some kind of short but I'm not sure where or...
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