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  1. Lebowski

    Yet another Lebowski + Honda IMA inverter & step-by-step

    For my testing I used a drill The idea was to be able to run the big screw fully into and out of the block of wood, sensorless and from standstill. So even stopping for the last cm, and then re-starting from sensorless. The motor was pretty small I ran it at 50A phase current. It worked...
  2. Lebowski

    Yet another Lebowski + Honda IMA inverter & step-by-step

    It requires some small degree of saliency cause thats what the principle is based on. I added the opamps to increase sensitivity (amplification) but also the be able to detect saliency while applying large torque producing phase currents (filtering). You can do without the opamps when you have...
  3. Lebowski

    Yet another Lebowski + Honda IMA inverter & step-by-step

    Hall sensors are indeed finecky… the best is when they are external to the motor and do NOT see any magnetic field from the coils. This is the case I think I used for my controller. The case where the sensors see the field of the coils is fundamentally different… It would cool to take the time...
  4. Lebowski

    Suzuki RF400E, now with Enertrac MHM602

    What I found with Hall sensors is that they can be unreliable, kinda. If they are really in the motor then they will pick up the field from the permanent (rotor) magnets PLUS the field from the coils. At high current the sum of those two represents a phase shift that can make transition rough...
  5. Lebowski

    Legends dropping like flies

    Turns out she lived like 3 miles away from me (as the crow flies)...
  6. Lebowski

    True FOC: definition and examples

    Yes https://endless-sphere.com/forums/viewtopic.php?f=30&t=103025&p=1506964#p1506964
  7. Lebowski

    Axiom: a 100kW+ motor controller

    Quick comment on what mxlemming wrote about the ADC in the 30F... yes it has only one ADC but it has 4 samplers. So it samples the 3 voltages from the current sensors all at the exact same moment, and then does the ADC conversion on the sampled voltages one after the other. So the ADC readings...
  8. Lebowski

    Axiom: a 100kW+ motor controller

    Nice to hear your car is working good with the Lebowski controller IC. It cannot recover past 130kph because at those speeds with your specific motor and battery voltage it needs field weakening. Field weaking requires synchronised currents to flow, which it cannot do because it is not synced ...
  9. Lebowski

    Axiom: a 100kW+ motor controller

    This is why I never went into making commercial controllers. Especially, what when accidents happen and you get sued for selling an uncertified controller ?
  10. Lebowski

    New ground-up ESC - MESC_FOC_ESC

    The basic idea behind the Lebowski controller is simpler: - the phase of the voltage delivered to the motor (so the voltage at the output of the controller) must be equal to the phase of the current delivered by the controller. In this way positive power is delivered to the motor. What the motor...
  11. Lebowski

    Homemade Axial flux PM motor

    My opinion on the purpose of steel cores for coils is different. Motors and generators are the same thing, just the power flow is different (electrical to mechanical or other way around). Anyway, for a generator it is easy to see that focussing the magnetic field from the permanent magnets...
  12. Lebowski

    What can ES do to support open source ebike software?

    As you may remember I built an entire FOC controller from scratch, including software and sensorless full torque start from standstill I have no clue what any of the words in the OP mean... or why I would need that ?
  13. Lebowski

    What's the myers-briggs type makeup of endless sphere?

    ISTP-A here...
  14. Lebowski

    Axiom: a 100kW+ motor controller

    You need to sample the ADCs not at the same rate as PWM, as aligning is too difficult. When an ADC samples you create aliasing where everything folds back into baseband (Nyquist theorm). You need to sample at a rate where PWM induced currents (which are at double the pwm frequency) fall close to...
  15. Lebowski

    Another attempt at building a motor controller

    It took me a bit longer, but I started from complete scratch (with no example papers to read) and coded in Assembly...
  16. Lebowski

    Another attempt at building a motor controller

    You have roughly 40 times more samples and 1 extra bit, which equates to only 22 dB or 3.5 bit better performance than the ADC I use. The analog amplification and filtering will get you way more than that. With analog you can really bring down the main motor powering signals and have a lot of...
  17. Lebowski

    Another attempt at building a motor controller

    For the 0 or 180 determination, I did not want to assume the rotor could actually move. What if it is locked solid with no movement, but you still want to generate a force in the coreect direction ? The 2nd order signal needs quite some current to see, though proper complex analog filtering (so...
  18. Lebowski

    Another attempt at building a motor controller

    Nice to see someone playing with this :D I didnt do oversampling or throwing away ADC samples or anything like that. I subsample and just good old fashioned FIR filtering and down sampling. Thats why I have a section at the end about how to choose the frequencies, so that the sub and down...
  19. Lebowski

    Lebowski controller IC 2.B0 source code and (short) explanation

    Sorry, I am not adding any new code. The whole reason for publishing the source code is that I dont need to continue with it. I broke down my hobby table where I did all my development, so cannot run any tests anymore. Its my home office table now...
  20. Lebowski

    Ampera/Volt inverter with Lebowski brain

    Have you disabled also the online current sensor calibration ? This one can run away and cause problems after a while, if turned on. This one can be disabled in the currents menu I think, something about current sensor calibration when current under ..A
  21. Lebowski

    BBSHD issue with 48v battery

    Welcome !!!
  22. Lebowski

    APL's DIY axial-flux motor

    If you make the winding basically a big circle around the axle, wont you induce eddy currents and losses in the axle iron ?
  23. Lebowski

    Another SMD lebowski PCB

    Old school 9 pin RS232 give out inverted signals wrt the microcontroller, so that is why I added inverters. I used the bipo schematic because it does not require a chip I dont have. Also, the bipo can deal with +-15V at the input, if necessary. Most 9 pin RS 232 nowadays also accept 5V signals...
  24. Lebowski

    True FOC: definition and examples

    The voltage is the derivative of magnetic flux. So integrating voltage gives magnetic flux, for a coil this equates to 0 after a north and a south poled have passed a coil.
  25. Lebowski

    Analysis of regen on an ebike

    What you want is as much power into the recipient of this power with minimum losses. This means that for the recipient the voltage and current vector have to be in phase (cos phi = 1). When powering the motor this means FOC, or, the current vector must line up with the BEMF vector. In regen...
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