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    Thread for new battery breakthrough PR releases

    A performance car is approaching or exceeding 1000 amps on 400V. So having 1/4 or 1/8 the voltage would complicate things. But sure, if it's a light vehicle it can get some performance even on a lower voltage. But then I'm thinking less than 500kg. My electric car (1200kg) has a 120V (32s)...
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    Thread for new battery breakthrough PR releases

    I have to agree it looks fishy. There was a suspected scam from a Swiss EV startup company a few years ago. A hydrogen car which was supposed to have supercar performance. Thing is, it was supposed to have a 48V system... so the claims couldn't be true of course. Not possible to get high...
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    Thread for new battery breakthrough PR releases

    They do have patents, and they have been focusing on developing an electrolyte which doesn't produce unwanted and irreversible side reactions. So there is nothing obvious saying that it is a bluff. Not sure if there is anything backing the claim of 1000Wh/kg. Alevo seems to have been using...
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    Thread for new battery breakthrough PR releases

    They are making one of the highest claims to date. 1000Wh/kg and 50000 cycles at 100% DOD. https://innolith.com/
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    Toyota and Panasonic form huge battery R&D & production partnership

    I think this sounds like a high up corporate decision, and not something sparked from an innovation in a lab. Lots of manpower and hours will definitely lead to refinement of known technology. But not necessarily lead to innovation.
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    Thread for new battery breakthrough PR releases

    Here is a paper about solid state batteries with claims high power: "The cell possesses high specific power that is superior to that of conventional cells with liquid electrolytes. Stable cycling with a high current density of 18 C (charging/discharging in just three minutes; where C is the...
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    Thread for new battery breakthrough PR releases

    I don't think that is correct. Solid state batteries are often claimed to solve the power issue of liquid electrolyte lithium ion batteries. Especially for charging, since the solid electrolyte batteries doesn't have the drawback of a graphite electrode and SEI-layer buildup. So they should have...
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    Thread for new battery breakthrough PR releases

    Solid state batteries are not significantly different to other kinds of lithium ion batteries. Most parts of the battery is the same. But there is no separator, and the graphite electrode is replaced by solid lithium, which has two main benefits: -We get rid of the nasty electrolyte used in...
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    Lebowski's motor controller IC, schematic & setup, new v2.A1

    Usually those sensors gives an output signal which is a small current (that is proportional to the measured current). So its just a matter of connecting some resistors of the right size on the output to get a 0-5V signal. But check the offset and noise specs, they might not be good for a sensor...
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    Sensorless at standstill, development updates and status

    Amazing work! So how does it work with power? Does it take a "break" from driving the motor now and then to run the algorithm, or does it work continuously while powering the motor? (Not that I think it matters much for the user. I am mostly just curious and amazed!)
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    SUPER SOCO ... no Sur-ron here =)

    I found some pictures of the insides of the battery: Since it's 60V, I have assumed from the start that the battery is 16s, which would mean 3.75V per cell nominal, and 16s would be a perfect fit to many cell monitoring IC's. But from these pictures it looks like 17s9p or 17s10p right...
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    Thread for new battery breakthrough PR releases

    I'm bumping this, because I think it seems promising. What are your comments to this solid state electrolyte? Apparently, it can also be used for alkaline batteries (Zn/MnO2), which makes them rechargeable. This might be a more environmentally friendly battery than lithium with cobolt. And...
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    Update files Lebowski controller IC, latest: v2.A1

    Hey Lebowski, I haven't visited this site in a long time. I'm thinking about buying one of your chips. I remember you showed a video once where you had a GUI which showed a dot spinning in a circle at the same speed of the motor. Are you still using that? Would that be a good tool to use when...
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    Yamaha PED2 and PES2 AND YPJ

    I think the Yamaha PES2 (the sport bike, first pic) looks great. I almost feels bad, how good it looks. And at 130kg, it's lightweight too... Great bike. Did anyone find more numbers on it, like battery energy, and motor power?
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    Conclusive proof gearboxes are awesome.

    The skin depth roughly limits the width of the conductors. In SMPS transformers the flux swings from full positive to full negative with a frequency of 20kHz to 2MHz or so. The skin depth is half a millimeter down to less than a tenth, in that span. In motors the full flux swings with the...
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    Plettenberg Nova motors and MST controllers: 15, 30, 150kW

    Send them an email and ask. From the manual, it looks like throttle controls PWM duty, which would be speed control.
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    Lebowski's motor controller IC, schematic & setup, new v2.A1

    I'm not sure if the battery fuse will blow fast enough to save the controller though. I think that field weakening will have benefits even if the motors no load speed is never exceeded. Without field weakening the controller can't put full current all the way to no load speed, because of...
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    Revolt Rv-120 Pro Is this motor for real?

    Maybe, depends on what you expect. Depends on the controller as well. Do you know any motor of this power which have lower no load losses? I know one motor, but not the same size. The Agni 95 is about twice the weight and twice the power, but has about the same no load losses as this one...
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    Revolt Rv-120 Pro Is this motor for real?

    You might get longer range if you gear for a lower motor speed. But then you don't get the same power/acceleration. At 36V it's about 180W no load losses, v.s. 500W at 72V. At 96V it would be somewhere around 800W. There is a tradeoff between winding and no load losses when choosing gearing...
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    Revolt Rv-120 Pro Is this motor for real?

    If you look to the right in the graph you see ~7A no load current at 72V and ~3225 rpm. From the graph we can make some rough calculations of performance. No load losses at 72V: 72V*7A = ~500W kv = ~3225 RPM / 72V = ~45 RPM/V At 100A the speed dropped to ~3040 RPM. (3225RPM - 3040RPM) / 45...
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    ERPM limits of controllers, an observation

    The 6-step trapezoidal controller, which my original post was about, will commutate 6 times per electrical cycle. http://www.pmdcorp.com/images/2013/january_2013_deep_dive/F5_Commutation%20Schemes%20-%20final.jpg That's why I multiplied the motor frequency by 6 to get the commutation...
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    ERPM limits of controllers, an observation

    It was a long time since I wrote that, but I can't see anything wrong with my (simple) math, even though it might be a bit obsolete with regards to vector control (which is being discussed in the thread). 100000 {ERPM] / 60 [Hz/ERPM] = 1667 Hz motor frequency (not commutation frequency) 6...
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    Thread for new battery breakthrough PR releases

    This does actually look really promising. They have made real working cells, so it's not just theory. 2x current lithium energy density should be like 350-450Wh/kg.
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    electric diving scooter

    If you increase battery voltage, you probably need a current limiting controller. Or at least one that ramps up the speed slowly so that it doesn't instantly put a very high current into the motor when it switches on while the motor is not moving. I believe that is what killed the transmission...
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    My new Electric Outboard Motor ( hub motor ) Silent and Fast

    You will probably have to have a custom propeller made if you want to match Torquedo's performance.
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