[NSRCA-discussion] Electric vs. Glow

[Ed Alt]

Also, though it's a great thing if it can be implemented well, regenerative braking will contribute to heating of the motor and it may actually reduce the downline braking effect somewhat.  If you don't dissipate the energy into a load, the motor will spin at a higher RPM while windmilling, effectively increasing the disc area and allowing it to cool a little bit on downlines.  Re heating, when a load is applied (the battery under charge in  this case), the voltage generated by the motor windings now results in a fairly significant current flow (no, or very little flow happens without the charge path closed).  This will result in electrical power being dissipated in the windings, therefore heating will occur on a downline, not cooling.  Also, since the battery is already running warm, it may not be very good for it to get these brief and relatively large charging currents.  Not sure how bad that effect may be, but it's got to get evaluated by a battey expert.  Sure would be good to solve the problem and keep everything within safe parameters though.

Ed
  ----- Original Message ----- 
  From: Earl Haury 
  To: NSRCA Mailing List 
  Sent: Saturday, February 18, 2006 6:27 AM
  Subject: Re: [NSRCA-discussion] Electric vs. Glow


  Bob

  Regenerative braking is the holy grail for hybrid E vehicles also. While the motor is an effective generator with the controls available, the issue is the ability of the batteries to accept the resulting high charge rate. Some systems have been designed using capacitors to smooth the flow, but large capacity requirements limits practicality. Of course with LiPo charge rates in the 1 - 3C range, this becomes even more problematic for our systems.

  Earl
    ----- Original Message ----- 
    From: Bob Richards 
    To: patternrules at earthlink.net ; NSRCA Mailing List 
    Sent: Friday, February 17, 2006 8:38 PM
    Subject: Re: [NSRCA-discussion] Electric vs. Glow


    Now if they could make the brake regenerative, they would have something!

    Bob R.


    Steven Maxwell <patternrules at earthlink.net> wrote:
      Jason I hadn't heard about the brake either, any more little things to made things work better.
       Steve Maxwell


        ----- Original Message ----- 
        From: Verne Koester 
        To: NSRCA Mailing List
        Sent: 2/17/2006 8:49:13 PM 
        Subject: Re: [NSRCA-discussion] Electric vs. Glow


        Hi Jason,
        I'm venturing, or maybe I should say, wading into electric this year. You mentioned the brake eating gears. I'm sure you meant the conventional brake that flat out stops the prop. What's your thought on the Hacker f3a brake that comes with the competition version of the speed control? We haven't seen or heard much of anything about this motor or the controller since the Worlds.

        Thanks,
        Verne Koester



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