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  1. S

    Travel friendly 13s1p battery pack using 18500 cells, need cell and BMS recommendation.

    I am building travel friendly < 100wh battery packs for a 48V ebike motor. Originally I was going to target the Panasonic NCR18500A cell : NCR18500A - Lithium-ion Batteries - Secondary Batteries (Rechargeable Batteries) - Panasonic This cell has a capacity of 2.040 ah @ 3.6V. 13 of these in...
  2. S

    Modular 48v 100Wh battery build?

    Ideally I'm thinking I would set up something like the following: Starting with 3000mAh cells @ 4V = 12Wh per cell, so 8 of these cells gives us the max allowed by the TSA. Link these 3p3s = 9Ah @ 12V. This is one subpack. Each subpack has a connector that allows it to be connected to another...
  3. S

    Modular 48v 100Wh battery build?

    Do you have any idea about this modular connector? I'd also like to not have a BMS per pack and instead have one BMS that charges once the modules are connected?
  4. S

    Modular 48v 100Wh battery build?

    I am wanting to build a modular ebike battery with packs in 100Wh increments so that I can fly with my bike (when COVID is over). Has anybody done this before? What would be especially awesome is if someone has made the modules in a way that they are waterproof so that I could travel with my...
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    High torque motor at 0rpm (stalled)

    So, without weights how is it that the user will be able to generate electricity via a motor while maintaining the feel of say 200 pounds worth of weight? I don't see how this is possible.
  6. S

    High torque motor at 0rpm (stalled)

    I don't see how a magnet would be able to exert a constant force across the entire linear motion of the machine? The force is proportional to the distance so you need some sort of magnetic rail like in a maglev train?
  7. S

    High torque motor at 0rpm (stalled)

    How can you make a system without a clutch that enables the motor to keep spinning while the system itself is stalled? Also regardless of whether the motor is spinning if the entire physical system is "stalled" wouldn't the heat generated be more or less the same? And the motor would be spinning...
  8. S

    High torque motor at 0rpm (stalled)

    To be clear this is not for an ebike but since you guys are the electric motor wizards I thought this would be a great place to ask! I'm looking for basically a configurable torque motor that can output between 1 - 50Kn of torque at stall without burning up. I'm trying to DIY a version of the...
  9. S

    High torque motor at 0rpm (stalled)

    Are there any motors that can generate 50Nm of torque in a stalled or 0 rpm state? I guess this would be a direct drive gearless motor? How would this work with a gearbox?
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