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# Re: eddy current brake

- To: femm@yahoogroups.com
- Subject: Re: eddy current brake
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Mon, 31 Mar 2003 15:43:04 -0000
- In-reply-to: <b5nc9k+mol8@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "mvalca" <mvalca@y...> wrote:
    > Hello everybody,
    > I am looking for some basic theory of eddy current brake, can anybody
    > suggest to me a site with those informations? I am interested mainly
    > on some simple problem exactly solved.
    >
    > thank you
    >
    > Marco

    I don't really know of a good _simple_ explanation of eddy current
    brakes. Although the mechanism by which they work is somewhat
    intuitive, the mathematical description of them can be nontrivial.

    Anyhow, I like to think of eddy current brakes as being like induction
    motors--you could get a lot of insight into eddy current brakes by
    thinking of them in that way. An eddy current brake would be the
    special case of an induction motor in which the applied frequency is
    zero (i.e. DC currents are flowing in the windings of the machine).

    I also had some note that I wrote a while ago "for fun" that describes
    how one would obtain a closed-form expression for the force produced
    by a particular configuration of linear eddy current brake. Since the
    answers are analytical, it may be possible to glean some intuitive
    insight about what's going on, although it's still pretty
    mathematical... I've put a copy of this at:
    http://groups.yahoo.com/group/femm/files/halb.pdf
    This note is somewhat similiar to the recent paper:
    Spok-Myeong Jang, Sung-Ho Lee, and Sang-Sub Jeong, "Characteristic
    analysis of eddy-current brake system using the linear Halbach array",
    IEEE Transactions on Magnetics, 38(5):2994-2996, September 2002.

    Dave.

- References:
  - eddy current brake
    - From: "mvalca" <mvalca@yahoo.com>

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