This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Lecture 2. Variable Reluctance Machine Example 1 A Ccore electromagnet has a winding of Nturns. What is the force acting in the x direction on an iron armature? Assume the iron of the Ccore and the armature to have very high relative permeability so that the flux pattern is as described below: Let The mean length of the iron path be L . The airgap path is x 2 . i H is the iron magnetic field intensity. a H is the air magnetic field intensity. Amperes Law = a J l H d d yields i N x H L H a i = + 2 (1) i x x f armature turns N a H a H i H Gauss Law The Bfields at the airiron interface are equal normally: a i i H H = (2) { ty permeabili relative i i a H H = (3) Substitute (3) in (1) ( ) i N x L H i i = + 2 i i x L i N H 2 + = Hence + = + = = x L i N x L i N H B i i i i i i 2 2 Let the crosssectional area of the iron be A A x L i N A B i i...
View Full
Document
 Spring '09
 BonTekOoi

Click to edit the document details