Power in Flux

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  1. Thread: AXE Wiring Note

    by lugnut
    Replies
    18
    Views
    12,567

    No personal experience but I've heard bitching...

    No personal experience but I've heard bitching about low inductance on large Agni, Lemco, Lynch, etc. And if any were to be found, ironless would likely be low on the list.
  2. Thread: AXE Wiring Note

    by lugnut
    Replies
    18
    Views
    12,567

    The 3 to 5 feet of cable will have inductance. ...

    The 3 to 5 feet of cable will have inductance. While it can be argued that a straight length of wire has zero inductance, that is not the case here. There is a circuit made with the cable and that...
  3. Thread: AXE Wiring Note

    by lugnut
    Replies
    18
    Views
    12,567

    Maybe nothing. Maybe shorter life of the...

    Maybe nothing. Maybe shorter life of the mosfets. Maybe instant mosfet failure. Could be they added that note for a reason.
  4. Thread: AXE Wiring Note

    by lugnut
    Replies
    18
    Views
    12,567

    Few, if any, golf carts use PM motors. The note...

    Few, if any, golf carts use PM motors. The note doesn't say for motorcycles _only_. I think the motorcycle was seen as the most likely place a low inductance PM motor would be used. I think you'd...
  5. Thread: AXE Wiring Note

    by lugnut
    Replies
    18
    Views
    12,567

    Yes, because PM motors will have significantly...

    Yes, because PM motors will have significantly lower inductance than series wound motors. Such a low inductance load will allow current to rise faster than the controller can tolerate so extra load...
  6. Thread: Michael Czysz

    by lugnut
    Replies
    5
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    3,591

    That is a shame. Czysz made some great go-fast...

    That is a shame. Czysz made some great go-fast elmotos. He deserves a place on a wall of fame for EV innovators.

    I bumped into the fellow a few times and can't say I liked him. Circumstances...
  7. Replies
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    Killajoule went back to the flats last week and...

    Killajoule went back to the flats last week and recorded a 270.224 mph mile long pass. No records involved at that meet; just the need for speed. And it appears that she was top speed at the event....
  8. Replies
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    6,126

    LSR Bonneville 2014 Killajoule 241 mph

    Congratulations to Bill, Eva and the Killajoule Team. Awesome.

    A quote from the NEDRA lsit:
  9. Replies
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    4,897

    I like to check the units for such equations. ...

    I like to check the units for such equations. And they don't add-up for your power equation.

    Power (W) = Rate (Wh/mi) * Range (mi) / Speed (mi/h) = ((Wh/mi) * mi) / (mi/h) = Wh²/mi. :(

    I think...
  10. Replies
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    That fan is supposed to pull air thru the motor...

    That fan is supposed to pull air thru the motor and blow it over the outside of the motor frame. There are holes in the motor rotor and an intake at the opposite end of the motor. It is a pretty...
  11. Replies
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    6,208

    Kool. Do you have a source for those? I'd like...

    Kool. Do you have a source for those? I'd like to try one. Thanks.
  12. Replies
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    2,470

    WOW! Kool. That is great. Thanks :) I...

    WOW! Kool. That is great. Thanks :)




    I guess I am reluctant to copy and post it. I'll try it in a PM to you. Can I forward a PM to you?

    edit: Strange. I checked and that spam...
  13. Replies
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    2,470

    While I'm griping, I might as well.... I just...

    While I'm griping, I might as well.... I just noticed I had a notification. It was a message sent 5 days ago. Here is how it reads: It goes on to solicit with a website link. Never had that...
  14. Replies
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    Problem with ads

    The first post in a thread or on a page which I view always has an ad in the body of the message which crowds the content to the left and sometimes obscures portions of inserted images. It is really...
  15. Replies
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    A negative voltage reading across the battery...

    A negative voltage reading across the battery module indicates it is acting as a load instead of a source. You have a short in there. That's my guess;/
  16. You can do this manually by giving it just enough...

    You can do this manually by giving it just enough throttle for forward torque to exactly counteract the force on the bike in the reverse direction. In other words, use the throttle to hold position...
  17. It might not be a problem for your short races,...

    It might not be a problem for your short races, but with liquid cooled drive systems intended for continuous duty I found that the motor tends to heat up the inverter when they share a common coolant...
  18. I've never seen a technical regulation requiring...

    I've never seen a technical regulation requiring the kill switch to discharge the capacitors in the controller. Where did that come from? All the rule books I've seen just require isolating the HV...
  19. Replies
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    Got a website link?

    Got a website link?
  20. How does energy in the controller capacitors on...

    How does energy in the controller capacitors on the DC bus keep the contactor coil powered after the KSI power is killed? The previous argument was that killing the KSI instantly killed the coil...
  21. Replies
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    Yes, the test was done completely submerged. ...

    Yes, the test was done completely submerged. That is what I understood "flooded" to infer. Partially submerged or splashed makes a big difference in drag. However can be nearly as effective in...
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    I also was introduced to Boundary Layer Turbo...

    I also was introduced to Boundary Layer Turbo Fluid Dynamics. That is a blast from the past. But it was interesting although I didn't pursue it. But the basis is that the fluid element is acted...
  23. Replies
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    I worked on a project years ago where we looked...

    I worked on a project years ago where we looked into this idea of running the rotor submerged in liquid coolant. I found some notes I still have in my file. We tested using an inverter driven...
  24. Thanks. That was a while ago and I didn't review...

    Thanks. That was a while ago and I didn't review that deeply. I've interrupted that contactor coil I bet a 100 times on Curtis and older Sevcon controllers without problems. I have also seen these...
  25. Where did you find this information? I've never...

    Where did you find this information? I've never seen a warning against opening the coil drive circuit from Curtis. And I've done it many times with no ill effects.
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