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    GaN Mosfet --- Arlo?

    don't want to miss the opportunity to have the first GaN e-bike :D :D :D :D :D :D :D something like the VESC-X bu with with this Mosfet http://eu.mouser.com/ds/2/692/GS66516B%20DS%20Rev%20170321-1107590.pdf , Low current , high voltage , very efficient. Also it will work good on my solar car
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    GaN Mosfet --- Arlo?

    OK , let's do it ! send PM to me
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    GaN Mosfet --- Arlo?

    as far I know the driver part is the same of regular mosfet , also the load sharing is the same of the mosfet For sure I know that 3 Formula E team already use this kind of mosfet but form online store looks like now is possible also for "normal" people to use it I'm not an expert electronic...
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    GaN Mosfet --- Arlo?

    what do you think about this type of chip ? in the high voltage , low current can be easier to use this mosfet instead of one IGBT http://eu.mouser.com/ds/2/692/GS66516B%20DS%20Rev%20170321-1107590.pdf
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    Help with Emsiso eDrive 400 controller

    I have a Emrax 228 and emsiso H300 , up to today the biggest problem is the lack of the precharge by the controller , but is more or less working some error are not so clear and also the fact that the tuning paramenters are divided in application is sometime confusing
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    MOTOR PORN !! EMRAX 228 teardown !!

    i'm currently using this motor in a project , I will keep you updated how it goes
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    75-5 & 75-7 Motors - Looking for Test Engineers

    the most significant is the starting temperature of the motor , in winter you get much more time than in summer or form an hot motor. Second depends on airflow on the fin , i did some try with oilcooling the ZF motor but if air cooled performance are enough for you the best is just to stay on...
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    GaN or SiC witch semiconductor MOSFET will be the best?

    why do you think GaN and SiC need to mature more ? some OEM part supplier for cars have already GaN Level2 charger for Electric cars ready for the market https://chargedevs.com/newswire/level-2-charger-with-gan-semiconductors-achieves-record-efficiency/
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    GaN or SiC witch semiconductor MOSFET will be the best?

    I'm looking into the spec of some GaN transistor and they look much better than normal MOSFET , for example this http://www.gansystems.com/datasheets/20150904/GS61008T%20DS%20Rev%20150904.pdf transistor is a 100 V 7,4 mOhm and is only 3mm x 6 mm big and is rated for a peak current of 90Ampere ...
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    spot welding nickel strip on aluminium busbar

    Hello, i'm building a batterypack based on LG 18650HE2 2500 mAh 20A IMR. 36s 30p , I have 30 nickel strip in parallel connecting each "s" at the side of the pack I would like to use aluminium busbar to collect the current from the 30 nickel strip ( a bigger aluminium busbar is lighter than an...
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    Triple solid slot Zero 75-7

    interesting document , also it points out that 2 layer windings have higher loss for added interference between 2 phases , 1 layer windings have higher loss for longer end turn but maybe with the better copperfilling of 1 layer and also with this reduced interference 1 layer windings can still...
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    Using the same throttle to power a hub & mid drive motor

    you can use a wire throttle from a motorcicle and a dual output potentiometer for the 2 throtte , dual potentiometer are very common in audio when you have to regulate the volume for left and right channel. is very cheap and works perfectly
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    BLDC eddy current loss

    lamination works because they are insuladet , if you put a screw shorting the lamination together there wil be a huge drop in efficiency and the motor will have a localized overheating. Also drilling a hole will interfere with the magnetic flux and some other parts of the lamination will...
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    9S10P outrunner motor , will it work ?

    ok , got it . It will turn , current will be banced but it will be unbalanced the mechanical force vector , a lot of noise and the bearing will suffer a lot and with this configuration there is nothing you can do ( skewing , magnet shape or other solution) BTW reading the thesis I never...
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    9S10P outrunner motor , will it work ?

    Hello , somenone have experience in outrunner with 9 slot 10 magnetpole configuration? It will run smooth or il will be unbalanced? From the windings looks unbalanced but with a rethinking the vector from the 3 phases should balance.
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    Analog fuel gauge for Emus BMS?

    when you change the current sensor you need also to change the calibration inside the software , maybe it will not solve but it may help to find out the issue
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    log 12s cell voltages??

    AFIK cellogs unbalance the pack only for cell 7 and cell 8 , becuse cellog take power from the fist 6 cell. If you use une cellog every 6 cell you can leave them connected
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    Farfle's Mk.5 Super badass outrunner

    one solution can be the release of a distribuited client like the Seti Project. Everyone of us can keep the Emetor client instaled on his computer , when someone need a simulation the job is splitted in many small packets and sent to all the Emetor-client available online. Simulation are very...
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    Copper loss

    Hello, i'm thinking about copper loss on pulsed current. Let's say I have a copper wire able to hold 50A , if I have a pulsed current of 100A for half time and 0A for the other half the same wire will hold or not? (frequency about 50 Hz square wave) Considering the formula I2R looks like the...
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    Miles' 90mm inrunner build thread

    that design was "community made" , in Guzzi they found out this thermal issue during the fist tests , and since the chief designer was taliking about it in the "new motor building" thread I suggested the improvement and later they invited me in the factory to see it made because it solved the...
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    Miles' 90mm inrunner build thread

    Nice motor , I'm waiting to see it in real life (BTW wil be available to the pubblic? Price estimation? ) I know you are not a fan of finned motor but there is a trick to increase cooling without using space , is to thread the outer casting , the tread act like finn and almost double the...
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    Colossus alternative (120100 Outrunner)

    as big outrunner I also know this motor http://www.freeair.cz/freeairen/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=168&category_id=49&option=com_virtuemart&Itemid=53&vmcchk=1&Itemid=53 but I don't know if is just vaporware or not , I send them a few mail but I did't get...
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    Yet another Lipo Fire

    do you have the log of temperature and voltage of the sigle cells ? I helps a lot to see what went wrong , sometimes it can be an internal short of the cell , sometime a localized overheating ..many thing can start a Lipo fire Lipo are not 100% sure , are great batteries for power density...
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    What is three dimensional magnetic flux?

    a good lamination material not only have an high saturation but also need a high resistivity to reduce eddy current , silicon steel have this very high resistivity so is a good material for iron lamination. Goin back on topic time ago I was dreaming about a finely powdered mu-metal , oxidized...
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    correlation between torque and magnetic field

    motor potential still the same , is just a matter of working point , or in other words to choose higher or lower Kv. when you get closet to the maximum every watt count. On sealed motor is very hard to cool the active parts because you don't have almost any air moving inside the motor , so...
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