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Alj

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About Alj

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    Seattle area
  • EUC
    KS-18XL

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  1. John Deere thing is mostly cherry-picked stuff taken out of content, here's an explanation from one of the Right to Repair guys himself. It is not as bad as it sounds.
  2. What other pleasant surprises KS app holds for the future? Uninstalling it.... just in case. Also not buying KS product again in a fear of it being a ticking paperweight.
  3. First ride after about 30 minutes of trying. reliable slow riding after about 3 hours. Fine control skills after about 100 miles.
  4. Copper is heavy. Aluminum is good enough here.
  5. Nope! I will never forgive you!!!! j/k
  6. That is totally usual thing. Cost savings is more important that cost of human life. Different culture. If you want this to be done correctly you have to go to China and sit next to the engineer and point at those things. That's how it is done usually by western companies which manufacture things in Shenzhen.
  7. I'm not comfortable with "heavy use" therm here. It assumes those "warnings on the dashboard". The user should be able to do anything. Its a human factor, you cannot control it. Well. of course if used decides to throw wheel from the cliff that is obviously user fault. But wheel should limit what user can do in order to save itself. Yes alarm as last resort. But first we can start tilting pedals to avoid further acceleration. If user decides to climb overheat hill that is not "heavy use" if you do it with sane speed to allow wheel to cool off. It, however, becomes "heavy use" if you do not have such mechanisms in place.
  8. If controller did not shut down then the current was not excessive. Too much would cause voltage drop and controller shutdown. The controller is intended to deliver as much current as battery can provide to the motor and that is what it was doing otherwise there is no reason to go bonkers with 100V battery voltage and beefy battery pack if you not going to use a half of it.
  9. First you get a warning on the temperature gauge. Then it will take awhile (probably an hour) for coolant to boil away before you seize the pistong. It is totally not an issue because i do not know a single person who would have experienced that.
  10. If that would be the case with the cars you car would explode if you press gas pedal too far to the floor when you climb hill. And there would be warning signs on the dashboard such as "please do not press gass more than 90%, please do not accelerate to 100kmh if you water temperature is above 70% but you can accelerate to 120 if you water temp is above 50% and avoid breaking if you rotors are hotter than 200C." However you do not see those warnings because car is designed with bottlenecks in manageable places. It is totally problem of the wheel. The wheel should not produce magic smoke no matter what used does. It is 100% problem of schematic design and software. "shut down" is too radical imo, there are softer ways of flow control such as slight tilting to limit max speed, make pedal angle "uncomfortable" for further acceleration which is about to push wheel to the limit.
  11. Its not. This is one leg of the voltage regulator chip (like LM317 or similar). It has big size to transfer heat from the chip to the PCB board. Given that there is OSCON cap and inductor next to it you probably looking at the buck converter circuitry. Look up "SOT-223" on google images - its a standard chip enclosure used mostly for voltage regulators.
  12. Pipes solve a problem where you have heat source in one place and heat sink in completely different place (due to form factor limitation) which is completely not an issue here. Here we have heat source directly attached to the heat sink (via poor silicone insulation coupling) and any additional layers such as heat pipes will make things only worse.
  13. Well any place except for "directly on the MOSFET" will be just barely informative and will be defined by how well heat transfers from the MOSFET to that place. Do they have anything besides MOSFET touching the heat sink (to measure its temp)? THat is what usually people do. However in our case it would not help because heatsink was not melting obviously but MOSFETs did because they were much hotter than the heat sink and that's why they failed, not being able to transfer heat to the sink efficiently.
  14. The square chip which what it seems like STM32 MCU has built in temp sensor for self monitoring (that is what most likely used in the software). Also you won't be able to spot temp sensor on the board (if there is any) because it looks very similar to SMD resistor or SMD ferrite coil. Ideally tmp sensor should be glued to the MOSFET, in which case it may look like generic diode in glass enclosure.
  15. I was thinking about that but you probably can do this only with hall sensor wire. If you pull wheel power wires through the different holes that will create a loop which will generate significant magnetic field which will induce current on other wires (hall sensor for starters) and may create havoc in random places. Need to do calculation, testing and measurements (like with anything else).
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