To achieve a better approximation in non-linear harmonic computation I perform two steps. 1- Run at frequency 0 and verify mur in the main areas (yokes, tooths) and establish a mean value (generall between 50 and 300), 2- Insert this new mur in material's properties, open small saturated area (as David suggested) and re-run at your frequency. If saturation is very different between areas, two or more different marerials may be used with the same B-H curve, but with different mur. Anyway it remains an approximation, and only a test can allow you to know how far your risult is from reality. bye _______________________________ ing. G.Bortolan Sincro srl via Tezze, 3 loc. Cereda 36073 Cornedo Vicentino (VI) Tel: (++39) 0445 450 500 Fax: (++39) 0445 446 222 e-mail: Giovanni.Bortolan@xxxxxxxxxxxxx tecnico.sincro@xxxxxxxxxxxxx REA 194515/VI Reg. Imp. 20968/VI 116 P.IVA 01925820241 "Diego Perez Lara" Per: "David Meeker, Ph.D." <dmeeker@xxxxxxxxxxxxxxxxx>, <diego.perez.lar <femm@xxxxxxxxxxxxxxx> @terra.es> Cc: Oggetto: [femm] torque computation 17/01/2002 20:13 Per favore, rispondere a femm Dear all, I have some problems calculating torque of an induction motor. When i'm doing a harmonic analisys, femm doesn't take into account B-H curve and i put a linear mu, but i can't achieve a valid result. i'm simulating a quarter of the motor but if i rise up mu, induction is huge. Do you have any clue to solve problem? i'm calculating torque from stress maxwell's tensor across a centered curve round the airgap with a fine mesh in it. Thank you Diego Pérez ____________________________________________________ (Embedded image moved to file: pic00041.gif) IncrediMail - Email has finally evolved - Click Here Yahoo! Groups Sponsor ADVERTISEMENT Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
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