Noisy motor

Discussion in 'Cinestar 8' started by Cris Olariu, Apr 13, 2014.

  1. Cris Olariu

    Cris Olariu Member

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    Alright. Bearings came in. Installed them. Now I have new bearings on motors 1, 3, 8. Also new props all around (the APC SF ones). Did a test flight. It flew pretty well, no issues. Motors look balanced right, so I'm not getting the reason for the temperatures on some of them (4 and 6 in particular). See below the GPX output.

    Let me know your thoughts please. Thank you!



    MK Version: FC HW:2.1 SW:0.88n + NC HW:2.0 SW:0.28n

    Flight date: 4/18/2014 10:36:54 AM
    Flight time: 10:36:54 AM - 10:44:18 AM (444 secs, 00:07:24)
    Batt. time : 447 secs, 00:07:27

    Elevation(GPS) : 0 3.01 8.129 m (min/avg/max)
    Altitude(Barom.): 1.3 4.19 8.05 m
    Vertical speed : -2.28 -0.21 1.87 m/s
    Max speed : 6.2 km/h
    Max target dist.: 6.3 m

    Sats : 7 7 9

    Voltage : min. 14.3, max. 16.3 V
    Current : 15.3 57 71.3 A
    Wattage : 225 858 1040.98 W
    Capacity: 7042 mAh

    Motor1: 5.4 6.5 8.1 A Temp: 25 60 71 °C
    Motor2: 3.8 6.2 8.5 A Temp: 25 61 74 °C
    Motor3: 6.0 8.3 11.4 A Temp: 19 58 68 °C
    Motor4: 2.0 6.5 9.1 A Temp: 20 51 61 °C
    Motor5: 3.9 6.7 8.6 A Temp: 22 59 68 °C
    Motor6: 1.7 6.7 8.8 A Temp: 23 55 64 °C
    Motor7: 6.2 7.5 10.3 A Temp: 22 60 68 °C
    Motor8: 4.4 6.6 8.6 A Temp: 22 60 71 °C

    Magnet Field: 95 99 106 % (ok)
    Magnet Inclination: 61 63 67 deg

    No errors found ;)
     

    Attached Files:

  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Cris: I suspect the problem with digital sensors (like digital watches) is they create the illusion of precision when no such precision exists.
    Motor #6 at 64C is only 4 degrees (5%) off from the average temperature of 68.125C.

    Unless you have any other reasons to fret, I think those temperatures look just fine -- there's going to be some sensor error amount in there as well (e.g. why is Motor 3 showing a higher peak current, but a lower peak temperature).

    So I'd just go fly but keep a watchful eye out for significant changes in the data.

    Please remember to smile when flying so that everyone knows you're doing for recreational and hobby reasons. ;)

    Andy.
     
  3. Steve Maller

    Steve Maller UAV Grief Counselor

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    Another item for my preflight checklist!
     
  4. Cris Olariu

    Cris Olariu Member

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    Thank you Andy! I'll keep at it!
     

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