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# Re: [femm] How to specify the magnetic material properties of lamination steel?

- To: femm@yahoogroups.com
- Subject: Re: [femm] How to specify the magnetic material properties of lamination steel?
- From: David Meeker <dmeeker@ieee.org>
- Date: Tue, 05 Aug 2003 09:56:04 -0400
- In-reply-to: <3F2ED2D3.1080003@plix.com>
- References: <bglqa4+r1d0@eGroups.com> <3F2ED2D3.1080003@plix.com>
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Dave Squires wrote: `Try M19 steel in the FEMM properties list. That is the usual material for cheap motor laminations. DRS jflrlk wrote: > Hi, > > The stator of our motor is made of laminated stack of steel. How > should I specify its magnetic material properties? > > Thanks a lot` Checking out the entries for various electrical steels in the materials library, as Dave suggests, is a good place to look for examples. If you want to define your own material from scratch, pick Properties|Materials off of the main menu. On the dialog that pops up, click the "Add Property" button. A dialog will then pop up that will allow you to enter detailed information about B-H curve for your material, lamination thickness and stacking factor, and information like conductivity and some hysteresis properties that are important for determining AC losses. As an aside, an interesting document that I ran across a few days ago is http://www.aksteel.com/pdf/markets_products/electrical/ElecPrBk042303.pdf This document contains all of the current pricing information for AK Steel's various grades of laminated stocks. Now, M19 isn't really a cheap-o stock. It's actually a fairly high-quality grade of non-oriented silicon steel, currently running about $0.81 per pound per this price list. Less expensive laminations are "cold-rolled lamination sheet" steel, as described at http://www.usx.com/corp/sheet/cr/mlsac.htm The cold-rolled sheet is carbon steel, rather silicon steel. Another good reference that talks about the various choices in laminated stocks is http://www.protolam.com/page3.html At any rate, the cold-rolled sheet costs the least per pound and is widely used, but the core losses are higher relative to silicon steels. -- David Meeker email: dmeeker@ieee.org www: http://femm.berlios.de/dmeeker

- References:
  - How to specify the magnetic material properties of lamination steel?
    - From: "jflrlk" <jflrlk@yahoo.com>
  - Re: [femm] How to specify the magnetic material properties of lamination steel?
    - From: Dave Squires <djsquires@plix.com>

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