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  1. L

    Ku63 controller at 12s voltage

    I have gone full circle from 1000w to 20kW and back to 250w, i’m just building a tootling around bike with a 10 year old ku63 controller that i never used in 2014 😀 I have a 12s battery and the ku63 is 24v/36v (on the label) - but i read here: Re: KU63 KU93 KU123 controller hacking that they...
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    LG E78 battery build

    I bought some LG E78 cells from Tumich here at ES so i'm planning a pouch cell battery build. Original goal was to do four 6s packs that i could use in different builds, on my emoto/Efoil/Tow boogie etc. but they might become too high for the efoil with the casing around them. Basic dimensions...
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    Looking for LG e78 pouch cells

    I am looking for a supply of LG E78 pouch cells, their form factor suits my next build: 78Ah capacity, 550 × 98 × 8 mm per cell Any sources out there? VW ID.3 / VW MEB platform and Renault Zoe supposedly uses these cells, but i need max 6s thickness - which i doubt i can split their cell...
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    QS 165 35h mid drive motor

    New QS 165 35H mid drive motor is out :D Presale link here: https://a.aliexpress.com/_mPEWCfO 235usd, 47Nm, not bad :bigthumb:
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    ”The barge” efoil build

    Building an efoil, first attempt. How hard can it be? 😉 I have very limited time so i’ll build quickly and to learn more than to do a beautiful design, it’s now called ”the barge build” It took about an hour to build a hot wire foam cutter with an old compoter charger and some wire so i am...
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    Recommendations for 30s lipo charger

    Hi, building 30s 30Ah battery, need a charger. Preferably with option to set voltage 120-126V and do currents above 2.5A (so no high power needed) What do you recommend? Been looking at meanwell led drivers 3x42V in series but total cost for the ones i looked at will be 200 usd or so. Isn’t...
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    Possible/probable Gsx r conversion?

    Just saw this on sale for 800eur. Can barely resist to get it, been thinking about doing a larger bike conversion for some time. What do you guys think, good candidate for a build?
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    Favourite hall connector - recommendations

    I’ve used the bulky kelly type hall connectors for years but never liked them. I’ve tried some jwpf connectors which i like but they can hardly be repinned if you make a mistake and they are so small they are hard to separate without tools. So.. what are your favourite hall connectors? Looking...
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    Chinese motor ratings :)

    I’ve thought about chinese motor ratings, often they are exaggerated to the double :D There could be a resonable explanation (in some cases) since load and rpm at max power and load and rpm at max efficiency are way different. Efficiency at max power goes as low as 50-60% so a 15kW max power...
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    Rewinding flipsky 80100 motor

    I got an 80100 motor from flipsky. It was seized straight out of the box - cables have been pinched and shorted during assembly. Anyway, i’ll rewind it with thicker wire and more copper so i thought i’d post the progress. Original kV was measured with a drill press and voltmeter to 130. All...
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    Apt961000 controller

    Thought i’d just post this for the high power users: https://tw.carousell.com/p/apt-96800-961000-235157182/ Could probably be bought preprogrammed by QS for your 1000A capable motor :flame: Price around 640usd on the chinese sites.
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    MAD M30 motor

    Found this motor: http://madcomponents.co/index.php/m30-100kv/ https://www.alibaba.com/product-detail/MAD-M30-49kg-Thrust-Heavy-Lift_60759471768.html - Winding looks great/ hand wound - Unbelievable specs, however detailed enough to get my interest. :D - 7kW@6000rpm continuous would make...
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    Pack build from LG automotive cells

    I crashed my old 18650 pack so i bought some LG 30Ah/10s lithium pouch modules from a forum member to build a new pack. They are said to be good for 300A discharge and comes from a Volvo s60 hybrid car pack. I will use 2 modules in series for a total of 20s governed by a bluetooth 300A smart...
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    MiniDyno motor test bench..scaleable 0-50kW

    I'm building a small dyno that can test most motors here, first revision max power is 30kW. It will be scaleable so it can probably go up to the double power with changed sensors and bigger flywheels. Or smaller with just other sensors. I have based the frame on alu profiles in 90x90mm. It is...
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    Programming APT AE96600 controller (update: NOT recommended, unstable program)

    I bought an APT AE96600 controller a while back but it's so huge i never used it. Now i have no working controller so my need is more critical :D :?: Anyone here has tried this controller and knows how to program it? It's got 36 FETs with 150v rating and it is HUGE. You won’t fit this on...
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    Taobao controller mania

    They sure know how to sell controllers over at taobao: https://item.taobao.com/item.htm?spm=a230r.1.14.226.42022bffwEXPK5&id=545955125720&ns=1&abbucket=5#detail Just translate that page through google and enjoy :D They seem to be going for hotrodded, watercooled motors and controllers :D, who...
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    Minimising rotor losses

    The main problem killing my Revolt motor was eddy losses in the rotor. I guess the magnets aren't electrically isolated from each other and the back iron ring, also it looks like there's metal foil between the magnets. I see something similar on the pics of your motor. When a rotor is built...
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    External hall sensor magnets update

    My original RV120 motor had hall sensors that did not function. The signals were disturbed by stray fields from the coils due to their poor postion and wiring. Therefore i mounted new sensors on the outside of the motor in this thread...
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    Propeller load for setting hall sensor position

    I want to optimise hall sensor position and don't think it's easy to get it perfect: If you measure current vs hall position at no load/WOT then the hall setting vs current is not very sensitive to position. I don't have a scope, and they measure voltage so the inductance will mess up the...
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    Rieju 50cc conversion

    Well, i crashed my old Kona Stinky ride, resulting in broken fork and wheels (and pride) I've spent 15000km and two painful winters of commuting on this bike, RIP.. It was time to start a new ride. I decided to go for a moped conversion to get more durability and real estate. I can tell you...
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    Magnetic reaction force and magnet strength

    I have thought a while about a fundamental question on the motor and force generation from the magnetic fields. The coils magnetic fields generated are turned on to interact with the permanent magnets in a BLDC This should mean that the force and torque of a motor are directly related to the...
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    Burnt kelly kls controller

    I guess i won't be needing this anymore :D It used to be a Kelly kls7230 controller, it shut itself off 3 times on the way to work, then it was completely dead when i was heading home again. I'm glad the whole bike didn't catch fire. I wonder why it blew.. FET seem to be marked K100E10NE...
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    Idiots guide to water cooled mid motor making

    I will try to improve a revolt RV120 rotor as the original one suffers from losses and heating, suspected to be from eddy currents in the magnets. My plan right now is to do a ironless halbach array rotor just for the fun of it! fixture and plug stls for 3D-printing: Rotor shell will be made...
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    Revolt motor sensors - bad hall position and wiring

    I have twitching and cutoffs on my revolt RV120 motor / kelly KLS7230 controller combo. When loading motor enough i get motor stalling, it cuts off a half second to come back with a jerk. Measuring battery amps show stalling starts at 35A of loading. If i go easy on the throttle until higher...
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    Idiots guide to rewinding Revolt 120 pro

    I will rewind a Revolt RV 120 pro motor to see if i can improve performance. It will be my first wind so that's where the headline comes from :D Some measurements of original stator (rough figures since windings are still in place): Approximate stator slot area: 190 mm2 (slot bottom width:6...
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