Hello, My name is BHASKAR. I am trying to realise the following in femm but facing problem. I wanted to realise a variable inductance motor which is actually a pretty good model for a stepper motor. When the iron piece is moved away from the gap, the cross sectional area of the core will decrease, there by decreasing the inductance.For a constant flux the internal energy will increase and a force will be exerted on the iron piece to attempt to restore it to its equilibrium position. The force F is given by F = m0 w N2 I2 / 2 lg Where m0 is the permeability of free space , w is the width of the air gap, N is the number of turns and I is the current and lg is the length of the air gap. For a force of 0.2 N, current of 1 amp, air gap of 2 mm and width of 10mm we get the number of turns as 252. I tried to realise this in femm but Iam getting a force very less than this in the x-direction where did I went wrong can any one give suggestions.I am sending the fem file attachment.Please send me your suggestions. BBHASKAR __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com
Attachment:
iron core new.FEM
Description: iron core new.FEM