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Tri Mortor set up

Old 06-15-2021, 09:09 AM
  #1  
loukis
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Default Tri Mortor set up

I am building a junkers ju52 3.7m. I am a bit concerned about the esc connection and location.
The outboard motors are quite a distance from the nose engine where the batteries will be located for CG purposes.
The motors are Leopard lc5065 330kv, with hacker opto iscolator ESCs and 4cell 8000mah bateries each motor will have two batteries (8 cell) connected in parallel. I am thinking of keeping the escs in the fuselage close to the batteries and make the motor cables extended.

Any advise welcome.

Kind regards
Loukis
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Old 06-15-2021, 04:04 PM
  #2  
ron_van_sommeren
homo ludens modelisticus
 
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Default

What will be the wire length between battery and controller, and between controller and motor?


If you cannot but extend, extend the motorwires instead of batterywires and keep controller(s) close to battery(s). No need for extra input capacitors

Too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG
Contents
  • Two problems
    • Voltage spikes higher than battery voltage: transistor/FET/chip breakdown.
    • Current through input capacitors too high: caps overheating/popping/exploding.
    • Nonsense Ron, I never had problems with long battery wires.
  • Example: four costly controllers consecutively cremated
  • Solution I: simply lengthen the motor wires instead
  • Solution II: add extra capacitors, rules of thumb
    Calculation spreadsheet
  • Capacitor type and polarity/orientation!
  • How & where (not) to add extra capacitors
    All capacitors as close to or on controller, do not distribute along batterywires.
  • DIY capacitor pack pictures
  • Capacitor & pack suppliers
  • Expert/manufacturer opinions & their rules of thumb
    They all say the same ... noise_reduction_101, switching_power_supply_design_101.
  • Cause, explanation, water hammer/knock analogy&
    , theory
    References
  • Measurements & scope traces

Vriendelijke groeten en wees voorzichtig, Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
• E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC •





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