Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 9 of 9

  1. #1

    Join Date
    Oct 2004
    Location
    FAIRPORT, NY
    Posts
    137

    Which ESCs keep brake on indefinitely ?

    I was out flying my Phoenix 2000 today and the motor continued to windmill. The BRAKE function is turned on, but does not stay on, it just brakes for a few seconds. This ESC is one of Hobbyking's that came with the plane. Can anyone verify that a quality brand ESC like Castle or Electrifly has a constant always-on brake function ?

    For what it's worth, this 2 m glider is a great flying plane but I had to replace the motor and re-engineer the motor mount. Oh yeah, and the brake does not work, but hey $ 80 receiver ready. I got under a growing cumulous cloud and had lift continuously even with the prop windmilling away.

  2. #2

    Join Date
    Oct 2006
    Location
    , CA
    Posts
    1
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Which ESCs keep brake on indefinitely ?

    Castle does. So does Jeti. Most every ESC supports hard braking which is what you want.

    Jim

  3. #3

    Join Date
    Dec 2001
    Location
    Snohomish, WA
    Posts
    677
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Which ESCs keep brake on indefinitely ?

    Please note there is no always on braking. Hard braking will help assure that a folding prop will fold or that a regular prop will stop but it won't prevent the prop from windmilling again once the braking action is done. No ESC applies a full time brake.

  4. #4

    Join Date
    Sep 2002
    Location
    Portsmouth, NH
    Posts
    193
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Which ESCs keep brake on indefinitely ?

    I suspect continuous hard breaking would be a consistent high drain on your battery. Anybody know how much current it draws when it’s on?
    I have seen things you people wouldn’t believe.

  5. #5

    Join Date
    Oct 2004
    Location
    FAIRPORT, NY
    Posts
    137

    RE: Which ESCs keep brake on indefinitely ?

    No power would be required if the windings are shorted to each other. Take a motor [disconnected from ESC etc.] and short two or all three wires together and try to turn it. You can rotate it but it will not spin.

  6. #6

    Join Date
    Sep 2002
    Location
    Portsmouth, NH
    Posts
    193
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Which ESCs keep brake on indefinitely ?

    Yes but that insen't the actual mechanism used in operation, is it? I thought the back EMF from the spinning prop was used to supply the breaking effort.
    I have seen things you people wouldn’t believe.

  7. #7

    Join Date
    Oct 2004
    Location
    FAIRPORT, NY
    Posts
    137

    RE: Which ESCs keep brake on indefinitely ?

    I just found a Turnigy 25A "Basic" ESC, cost $ 11 I think. I installed it in the Phoenix. Anyway, it provides permanent braking action. My problem with the one that came with the Phoenix is that it has no name or markings and would not respond to programming "throttle stick" instructions for Turnigy, Electrify or Thunderbird. I am going to wildly speculate that 'all' ESCs short the motor coils indefinitely when receiving a low throttle signal from the transmitter. With the transmitter off there is no braking. I don'y think it is using much power for braking, however I hope to hear from someone that is sure.
    The Prius uses back EMF to recapture the braking energy but our brushless ESCs can only brake, not regeneration.

  8. #8
    Moderator BMatthews's Avatar
    Join Date
    Oct 2002
    Location
    Chilliwack, BC, CANADA
    Posts
    12,006
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Which ESCs keep brake on indefinitely ?

    If you're not using a folding prop then it's going to windmill to some extent even if the brake is on all the time. An "always on" brake is simply one which shorts out one or more of the "phase windings" on a brushless motor. And at the sort of low RPM you get it can still windmill at anything other than slow to moderate flying speeds. It just won't windmill as fast as it would otherwise.
    Witty saying to be plagarized shortly.....

  9. #9

    Join Date
    Oct 2004
    Location
    FAIRPORT, NY
    Posts
    137

    RE: Which ESCs keep brake on indefinitely ?

    I had the Phoenix 2000 out today and the prop was folding back perfectly. This is a great thermal flyer from Hobbyking for $ 80 receiver ready.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 03:40 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.