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  1. everythingisawave

    Destruction Derby Car Build

    Would definitely like to see this on YouTube.
  2. everythingisawave

    how to program a sevcon gen4

    OK thanks. Looks like bad power connection would have done it, and also earlier on not enabling the forward switch during calibration, perhaps. Lessons learned..
  3. everythingisawave

    looking for advice on how to control this 12kw etorque motor for light hybrid, suggestions and ideas.

    Again I am not familiar with the Lebowsky, maybe it can do this but the resolver requires a 2-wire 10kHz excitation signal and 2 analog (differential) inputs to demodulate and process the signals. Best if you can get the OEM one working.
  4. everythingisawave

    how to program a sevcon gen4

    Good idea, a wiki would be great but would take more work.
  5. everythingisawave

    how to program a sevcon gen4

    That's how it is usually done but I'm curious about why it didn't work the first time, as we had provided suggestions about that and wondered what changed.
  6. everythingisawave

    how to program a sevcon gen4

    How did you do with the encoder calibration?
  7. everythingisawave

    Yamaha develops 496-horsepower motor for electric hypercars

    Yamaha provides motors to other OEMS and for racing as well, so I could see this as one of their test cases for that.
  8. everythingisawave

    4x4 LSV using hub motors?

    Sounds like a fun project. It is probably a good idea to have some kind of interlock to disable driving when charging is happening, as well as a maintenance plug that de-energizes the system manually. Also, moving the main fuse closer to the battery output is advisable, so that any kind of fault...
  9. everythingisawave

    High Power power supply for testing EVs motors controllers without battery pack

    IMHO efficiency mapping can be done more quickly if you automate and sync your data logging. It makes it even easier if you automate your motor command routines. I assume you are using a dyno setup, in which case if you can connect the two inverters back to back then the power supply only needs...
  10. everythingisawave

    Electric motor - what voltage?

    You need to start with some constraints, so I suggest you start with the motor you would like to use, dictated by the power and torque you would like to achieve. Then decide the minimum number of series cells to achieve that power (dictated by the voltage, include the effects of voltage drop...
  11. everythingisawave

    how to program a sevcon gen4

    Can't remember if the contactor will energize in pre-op? But yeah as @Padja said I would try swapping out the contactor to see, and also use a voltmeter to check if it is even making an effort to close the contactor. Sometimes the inrush of the larger contactors is quite high. If you're using a...
  12. everythingisawave

    how to program a sevcon gen4

    Also: also check that you aren't drawing any other power from the bus during precharge.
  13. everythingisawave

    Looking for featherweight geared hubmotors, >10kW

    One thing that is motivating going to higher speeds is sheer power density. Torque requires flux, and for a given size motor this is severely limited by material properties like iron saturation, whereas it's easier to increase DC link voltage and just increase the maximum speed. Dielectric...
  14. everythingisawave

    Looking for featherweight geared hubmotors, >10kW

    Silly question perhaps, what's a redrive?
  15. everythingisawave

    how to program a sevcon gen4

    I recall that the precharge system is sometimes finicky--did you check the pre-charge settings window? If the relay is not closing then the conditions for closure aren't being met, or the relay may not be operable by the Sevcon--I think it doesn't like PWM controlled relay economizers, like...
  16. everythingisawave

    Stator/magnet swept area

    I can't remember the exact equations, but I recall that rough estimations for comparison of machines can be done by making some starting assumptions about maximum current density and airgap flux density assuming that things have been optimized to make best use of the material, then from there it...
  17. everythingisawave

    Axial Flux Reluctance motor, pondering DIY layout

    Are we talking switched reluctance, or synchronous reluctance?
  18. everythingisawave

    Axial Flux Reluctance motor, pondering DIY layout

    Sounds like an interesting project, will stay tuned! I remember Mitsuba was trying these on their EV Kart racers a few years ago, but not axial flux. The controller is kind of different with more phase connections, because the SR motor can be driven in a unipolar fashion. Surprised and...
  19. everythingisawave

    Buick Lacrosse e-assist moto-alternator

    Nice sound!
  20. everythingisawave

    Inverter recommendations? 48V sine wave, no grid tie

    I think that a lot of older fridges and a/c units didn't have an inverter, so the problems you mention with inductive loading could lead to derating of portable inverters needing to supply reactive power. Newer units might work better? I've seen some spot coolers on the market that consume...
  21. everythingisawave

    True FOC: definition and examples

    Yes, good point. This is what is happening. When explaining to students I often tell them that aligning the rotor position sensor is akin to adjusting the engine timing, it really helps mechanics and non-EE engineers to understand its importance. Whatever helps you understand:)
  22. everythingisawave

    Could this be quite the bargain?

    Are there balancing leads?
  23. everythingisawave

    how to program a sevcon gen4

    Would be useful to see the encoder settings page, and if there are any errors. You might also need to do that calibration step when the inverter is in forward mode. However if it is not rotating at all I would advise to check your connections first. Also, regardless of alignment, you should...
  24. everythingisawave

    True FOC: definition and examples

    Technically by changing the Idq current vector angle you are changing the "timing" (taking this as a mental vehicle in this context), so while the dq part of the loop has no control over the basis vector angle, it does have control over your vector angle relative to the magnet flux. The word...
  25. everythingisawave

    New ground-up ESC - MESC_FOC_ESC

    Hey mxlemming, I just noticed you tried XMC a year ago. I used XMC4500 for a couple of projects requiring quick and dirty control, without too much high performance and I was equally impressed. The code generation and setup capabilities are really nice, even if the documentation is a bit sparse...
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