2.7 Associate properties with block labels
Right click on the block label node in the air region outside the coil. The block label will turn red, denoting that it is selected. Press to “open” the selected block label (Instead of pressing the space bar, one can use the Open up Properties Dialog toolbar button ). A dialog will pop up containing the properties assigned to the selected label. Set the Block type to Air. It usually sufficient to accept the default mesh density by checking the Let Triangle choose Mesh Size checkbox. If a finer mesh is desired, the box can be uncheck and a prescribed value entered into the Mesh size edit box. The mesh size parameter defines a constraint on the largest possible elements size allowed in the associated section. The mesher attempts to fill the region with nearly equilateral triangles in which the sides are approximately the same length as the specified Mesh sizeparameter. Click on OK. The block label will then be labeled as Air. Select and open the block label node inside the coil region. However, set this Block type to Copper. We want to assign currents to flow in this region, so select the Coil circuit from the In Circuit drop list. TheNumber of turns edit box will become activated if a seriestype circuit is selected for the region (e.g the Coil property that was previously defined). Enter 1000 as the number of turns for this region, denoting that the region if filled with 1000 turns wrapped in a counter¬clockwise direction (i.e. positive turns in the right¬hand¬screw 8/14/2015 Finite Element Method Magnetics: FEMM 4.2 Magnetostatic Tutorial data:text/html;charset=utf-8,%3Cdiv%20class%3D%22header%22%20style%3D%22position%3A%20relative%3B%20padding%3A%200px%2010px%2… 4/10 rule sense). Click on OK. NOTE: If we wanted to denote that the turns are wrapped in a counter¬clockwise direction instead, we could have specified the number of turns to be –1000.