Lecture2 - Lecture 2. Variable Reluctance Machine Example 1...

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Unformatted text preview: Lecture 2. Variable Reluctance Machine Example 1 A C-core electromagnet has a winding of N-turns. What is the force acting in the x- direction on an iron armature? Assume the iron of the C-core 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 B-fields at the air-iron 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 cross-sectional area of the iron be A A x L i N A B i i...
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Lecture2 - Lecture 2. Variable Reluctance Machine Example 1...

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