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    Big hub motor 308mm 56 poles

    Do you know anything about this motor? http://www.ebay.com/itm/BIG-POWER-E-BIKE-BRUSHLESS-MOTOR-REAL-1000W-48V-REAR-MOTEUR-ARRIERE-/160892099796?pt=FR_JG_Sports_Cyclisme_&hash=item2575ea9cd4...
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    MT13050 - 5.2kg 148mm diam outrunner

    http://www.rctigermotor.com/show.php?contentid=146 Does anyone know more about this motor? I tried emailing them, but no reply. Maybe we can get a reply if more people ask questions about the same motor?
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    Lamination Materials

    Electrical steel with higher max flux density than the common electrical steels. They are called Vacodur / Vacoflux, and saturates at 2,3T, compared to around (or less than) 2,0T for common electrical steels. http://www.edn.com/design/automotive/4416249/2/The-sportier-side-of-electric-vehicles-...
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    Colossus alternative (120100 Outrunner)

    Not the same rotor caps, but otherwise it should be the same as the air cooled Colossus. http://alienpowersystem.com/shop/120mm/120100-outrunner-brushless-motor-50kv-25000w-2/
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    Spray cooling brushes?

    Quote from Cedric: "It is possible to cool an Agni motor with water spray. The best place to spray is on the inner part of the armature opposite to the side the brushes run on, and you need about 40 milliliters per minute which you get from a 1mm jet fed by gravity with a 250mm head."...
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    420A 24S ESC by aliens

    Spotted these on eBay. Alien Power Systems. Controllers are for RC, but are supposed to work on bikes too. PC interface for settings. Air cooled 420A 24s...
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    Inside Zippy Compact 9s 5Ah

    I ordered some Zippy Compact 9s 5Ah's when they were on sale. One of the packs had a dead cell (arrived at 0.85V). I removed the shrink wrap and took some pictures. The dead cell is likely ruptured in the puffed end. It emits a strong smell if you put your nose close to the puffed end. Smells...
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    DIY 10kW motor

    I ran across this DIY motor! If i understand the videos right the stator is made by cutting pieces from transformer sheets and gluing them together. http://www.en.net.ua/diaz/oemotor/ edit: new link http://www.rcgroups.com/forums/showthread.php?t=1597794
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    Motorcycle generator as BLDC?

    What do you think about making a motor by stacking some motorcycle stators together and making a rotor with neodymium magnets? You can get the stators cheap on ebay or from junkyards. Are there any stators with good enough steel laminations?
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    Opel RAKe

    Opel RAKe / Vauxhall RAKe After the car’s appearance at this year’s IAA Frankfurt motor show, Schmidt and his team are moving to the next stage of development and undertaking two further market research projects – general consumer research and a potential end-user research project. Opel...
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    ERPM limits of controllers, an observation

    This may be known, but I haven't read it anywhere, so I thought I would put it out here to see what you say. I've seen that controllers have a limit on drive frequency to the motor, the so called Electrical RPM(ERPM) limit. Since microcontrollers are fast, it seems odd to me that the...
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    Fibre/nylon composite wheels?

    I'm toying with the idea of making a small light electric bike/motorcycle for racing on gokart sized tracks. It will have no pedals, and will be equipped with soft motorcycle racing tires for as high corner speeds as possible. I've mostly been looking at double walled 20" (406mm) BMX rims...
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    Hobbycity battery weight vs shipping weight

    How come there is such a big difference between battery weight and shipping weight on Hobbycity LiPo? Take this one for example: http://www.hobbyking.com/hobbyking/store/__19150__Turnigy_nano_tech_4400mah_8S_65_130C_Lipo_Pack.html Technical description says: "Weight: 1012g (including wire...
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    IPM - Brushless Interior Permanent Magnet Motor

    IPM seems like a compromise between the synchronous motor and the asynchronous motor. I haven't known about it until a few minutes ago. What can you say about it? who makes them? Motoczysz use a water cooled IPM in their electric racing motorcycle. Does anyone know which motor it is...
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    Scientist: "Oil will last for millions of years"

    "-This is not the end. This is not even beginning to end. Maybe this is the end of the beginning of the oil-age, "says Vladimir Kutcherov, professor of geology at the Royal Institute of Technology in Stockholm." "Most scientists believe that Earth's oil resources have been created by biological...
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    Lookin for low ESR capacitors for 600A brushed DC controller

    I'm planning to build a 100V 600A controller for a DC motor with about 11 milli ohm winding resistance. I don't want the controller to increase that resistance by much because that will degrade motor performance. I'm aiming at <10% increase. This means about 12 mohm total resistance in the...
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    Citroen C3 alternator/starter as motor?

    Some of Citroen's C3 cars doesn't have a normal starter motor, instead they got a combined starter/alternator. This improves city fuel economy by using the alternator mostly during braking, and allowing the engine to stop at red lights. Maybe this alternator can be used as motor in a small...
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    Internal resistance comparison number

    When comparing cells or batteries their internal resistance is a parameter. But if the cells/batteries have different capacity or different voltage the number isn't directly comparable. It would be better to use a number which is directly comparable. My proposal is to make this number by...
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    Headway 42120P

    http://headway-cn.en.alibaba.com/product/201224229-0/8Ah_lithium_ion_battery_cell.html Has anyone measured these? They have a stated internal resistance of 1.5 mohm, thats lower than four parallelled A123.
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