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  1. A

    Rough draft of a 6FET power stage intended to be part of a larger controller

    I couldn't sleep and so I took a whack at designing a power board for a fairly large motor controller. The board itself is a 6FET power board; the idea would be to parallel several of them to create a 150V, 400- to 600A-capable controller. The board takes in a differential PWM signal and...
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    Non-silicon and/or soft-switched controller topologies?

    I've been lusting after an Emrax 188 for a while; the only concern I have is figuring out how to run it/what controller to run it with. I saw Ben Katz's teardown of the 228LV here: https://build-its-inprogress.blogspot.com/2017/05/emrax-motor-teardown.html and the first thing he mentions is the...
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    Water in MegaShark pack; chances of revival?

    I bought a Sunseeker Fat Tad with a Bafang Ultra on it for a winter commuter this past November; I've been riding it to and from work in a variety of weather (including light snow and in the aftermath of heavy snowfall). I run two 14S7P packs in parallel in Hailong Mega Shark cases (my commute...
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    Rough draft of a MelonDrive

    Hey guys! I've started messing around with SolidWorks again, and while home sick from work I bashed out a rough draft of a drive unit designed to work with the Turnigy C80100 "melon" motor. It uses two internal jackshafts to achieve a 6:1 reduction internally, and then as of now I have it...
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    Starting an iZip I-500 build and have a few questions

    I just bought a used iZip I-500 from a guy off Craigslist and I'm planning on making something along the lines of MelonScooter out of it. I just measured the battery box and it looks like about 5.25" wide by about 12" long by 3-3.25" tall, so Wolfram Alpha tells me I can just barely fit a 16s7p...
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    Torque sensor details

    My apologies if this is a super open-ended question, but would any of you guys happen to know what electrical output a typical torque sensor sends on an ebike kit and how that is then read by the controller? I'm asking because I'm looking to build something similar to the Grit Freedom Chair for...
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    Non-single pivot suspensions on high-powered mid-drives?

    So now that Specialized's patent on Horst Link/4-bar link designs for rear suspension has expired, it should be feasible for small e-bike manufacturers to design and build frames that use non-single pivot suspension without running afoul of the law. I was wondering whether it would be worth it...
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    Stromer ST1 clone?`

    So I was screwing around on AliBaba earlier today and stumbled on this listing: http://www.alibaba.com/product-detail/26-inch-250W-or-350-W_60107310010.html?s=p Frame styling looks remarkably similar to that of a Stromer ST1, complete with wide flat downtube that looks like it hosts a...
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    Gate drivers for three-phase motor controller?

    I just had a quick question: I see a lot of the guys (namely ZombieSS) who are building up Lebowski controllers using the ACPL-333J from Avago Technologies; I'm wondering if there's any particular reason to use that as opposed to the TI ISO5500. I ask because for quantities under 100 there's a...
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    A possible homemade CC/CV bulk charger?

    So I've been looking at some of the charger diagrams, and I've drawn up plans for a reasonably safe and efficient high-power (1-5kW) CCCV bulk charger almost entirely out of "dumb" parts (inductors, capacitors, resistors, MOSFETs, gate drivers, and some op-amps and comparators for feedback...
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    High current drivers for "logic-level gate" FETs?

    So I've been playing with the idea of building up a Lebowski controller for a while, but haven't pulled the trigger on parts because of money and time constraints; I was looking at doing an 18-FET or 24-FET power stage with the FDH055N15A FETs from Fairchild rather than the IRFB4115s; they're...
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    Urban Arrow cargo bikes?

    I was out biking at the Arnold Arboretum today, and I happened to stumble on one of these things just parked alongside one of the main trails (image not mine): Upon closer inspection, it turns out that bike runs some variant of a Bosch mid-drive setup mated to a NuVinci N360 in the rear...
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    Removing/locking the freewheel in an internally geared hub?

    I've started doing preliminary planning on a very high-powered homebrew e-MTB build that would be bordering on light motorcycle territory, and I've been looking at using an internally geared hub inside the frame as a transmission (see this thread for more details on that. While doing a bit of...
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    Internally geared hubs as mid-drive transmissions?

    I'm pretty sure we've had a number of discussions about using internal gear hubs on mid-drive setups, and the general consensus seemed to have been that using an IGH laced into the rear wheel on a vehicle running a large RC motor (something like the Astro Flight 3220 or the Turnigy C80100) would...
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    ELifeBike BMSs?

    I'm in the planning stages of a stand-up escooter build; the plan for the battery pack is to use two 16s4p packs of the A123 26650 cells that I've sourced through some friends, while the power stage will be a Kelly KBS48121X (48V, 130A peak, 55A continuous) BLDC controller and a "melon" motor...
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