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Approaches for cooling the motor?

Discussion in 'Roadster: Performance' started by nick, Jul 18, 2017.

  1. nick

    nick Member

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    Once the motor hits the first yellow the car backs off the power, gets slower and slower (no error message).

    At Laguna Seca it would blast up the hill once, but I could watch the current (A) number back off further and further the second time up the hill.

    Flooring it from a stop - weak acceleration. Give it a few minutes to cool - back to normal power.

    Any thoughts on cooling the motor?
     
  2. dhrivnak

    dhrivnak Active Member

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    Dry ice???
     
  3. nick

    nick Member

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    Maybe some form of compressed gas that could be released into the motor when it gets hot (based on CAN messages).
     
  4. nick

    nick Member

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    Plan...

    CO2 tank in the trunk, regulator and control valve, piped to a nozzle near the motor.
    Hardware to monitor the CAN bus for temperature information, logic to trigger/control the release of CO2 through the motor.
     
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  5. Ampster

    Ampster Member

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    How about nitrogen? Ironic that an EV would use CO2 for cooling.
     
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  6. hcsharp

    hcsharp Active Member

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    The idea of using nitrogen has been kicked around before. I wonder where the heat is building up - the rotor or the stator? It will be hard to remove heat from the rotor.
     
  7. Tesla 940

    Tesla 940 Member

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    I was at Laguna Seca all three days of the Refuel event - had a blast. I usually ran 6 or 7 laps before noticeable reduced power. The first session each day was full power the entire 25 minute sessions. Interesting that you are losing power so soon.
     
  8. wiztecy

    wiztecy Active Member

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    I believe Nick has a 1.5, however the motors should be the same. Possibly they're driving them a bit differently. Would be interesting to see if another 1.5 experienced the same issues on the same day. The other possibility is the blower setup on the motor. The 2.x's ( with the updated blowers) I believe are able to force more air and possibly may be driving more current to the blower which would help reduce motor temps.
     
  9. nick

    nick Member

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    #9 nick, Jul 22, 2017
    Last edited: Jul 22, 2017
    #940... I wonder if the 2.0/2.5 has better motor cooling than my 1.5.

    I couldn't complete a start-to-start lap at full power after entering the track... get on the track between 2 and 3, full power around the track and back to the hill... then by the top of the hill it was losing power... about 380A instead of >500A. On the first session I tried to do one more lap and it maxed out at 202A up the hill.

    As a test I tried flooring it from a standing stop in pit lane - car slowly rolled forward.
    I waited 2 minutes for the motor to cool off one notch back to blue - back to full power.

    On the plus side I got my time down to ~2m03s (measured with a GoPro using the turn 3-4 Michelin bridge as the start/finish marker so not an official time). New Toyo R888R tires and at a lower pressure made a huge difference.

    Edit: painfully boring video of the lap:
     
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  10. nick

    nick Member

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    I wonder if the 2.x blowers would fit on a 1.5...
     
  11. snd92

    snd92 Member

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    I have a 2.0 with some 1.5 parts, e.g seats. Maybe these parts will fit 1.5

    fan_retrofit2.png

    fan_retrofit.png
     
  12. wiztecy

    wiztecy Active Member

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    I think you guys are missing it, you need the firmware to drive the updated 2.x fans/blowers. Its one motor with two fans/blowers. They're driving more current hence why the fans power on and when they get hot, spool faster. This is also the reason why the fan / PEM connector gets melted by driving it at and possibly past its rating. When either the motor or PEM temps rise the fan goes into overtime. So if it detects the PEM heating, the motor will get cooled down as a by product since its one motor and two fans. And visa versa, if the motor needs cooling the PEM will get cooling due to the cooling system running off of the same motor.

    PEM, motor gets too hot -- fans failed

    [​IMG]
     
  13. snd92

    snd92 Member

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  14. Tesla 940

    Tesla 940 Member

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    Nick, My best time was on day 3 at 2:03.6 using a SOLO timer. I had new AD07's front and moderately worn MPSS on the rear. I'm rather cautious with the car so I don't expect my times at any track to ever be impressive - but I do have fun. All my other track days (about 12) have been on Streets of Willow or Big Willow.
     
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  15. nick

    nick Member

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    This was my first time hitting 2:03.something. New set of Toyo R888R tires.

    On turns 3 and 4 the car tracked out nicely under acceleration with the new tires.
     

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