[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# Re: [FEMM] How does femm handle coercivity and core losses?

- To: FEMM mailing list <femm@list.foster-miller.net>
- Subject: Re: [FEMM] How does femm handle coercivity and core losses?
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Fri, 21 Nov 2003 14:11:15 -0500
- In-reply-to: <web-58942784@california.com>
- List-archive: <http://femm.foster-miller.net/pipermail/femm>
- List-help: <mailto:femm-request@list.foster-miller.net?subject=help>
- List-id: FEMM mailing list <femm.list.foster-miller.net>
- List-post: <mailto:femm@list.foster-miller.net>
- List-subscribe: <http://femm.foster-miller.net/mailman/listinfo/femm>, <mailto:femm-request@list.foster-miller.net?subject=subscribe>
- List-unsubscribe: <http://femm.foster-miller.net/mailman/listinfo/femm>, <mailto:femm-request@list.foster-miller.net?subject=unsubscribe>
- References: <web-58942784@california.com>
- Reply-to: FEMM mailing list <femm@list.foster-miller.net>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5; MultiZilla v1.5.0.2d) Gecko/20031007

`robert Macy wrote:`

>     I'm trying to predict the performance of an inductor made
>     using two different core materials.

> `First core material, has extremely low coercivity, less
> than 0.003 Oersteds. The second, has a coercivity of 0.05
> Oersteds. The two core materials are placed into the
> materials section using their BH characteristics.`

>     When running AC analysis, does femm take into account the
>     hysteresis losses associated with a more "open" curve core
>     material?

> `- Robert -`

`Hysteresis loss can be modeled via the "hysteresis angle" parameter. This parameter can sometimes be obtained via manufacturer's spec sheets as complex permeability (e.g. for ferrites), by noting that the hysteresis angle used in FEMM is the negative of the argument of the complex permeability. If no complex permeability is given, one has to end up sweating out some appropriate parameter from "raw" core loss data, which can be nontrivial to do.`
`For a reference on how this sort of thing works, check out:`
`Methods for magnetically nonlinear problems involving significant hysteresis and eddy currents
Jack, A.G.; Mecrow, B.C.;
Magnetics, IEEE Transactions on , Volume: 26 Issue: 2 , Mar 1990
Page(s): 424 -429`
`--
David Meeker
Senior Engineer
Foster-Miller, Inc.
350 Second Avenue
Waltham, MA 02451-1196
781-684-4070
781-890-3489 (fax)
dmeeker@foster-miller.com http://femm.foster-miller.com`
``

- Follow-Ups:
  - [FEMM] How do you interpret inductance values? And predict inductor Q?
    - From: "robert Macy" <macy@california.com>

- References:
  - [FEMM] How does femm handle coercivity and core losses?
    - From: "robert Macy" <macy@california.com>

- Prev by Date: [FEMM] How does femm handle coercivity and core losses?
- Next by Date: [FEMM] How do you interpret inductance values? And predict inductor Q?
- Previous by thread: [FEMM] How does femm handle coercivity and core losses?
- Next by thread: [FEMM] How do you interpret inductance values? And predict inductor Q?
- Index(es):
  - Date
  - Thread