MagOasis -- Magsimus Deluxe Tutorials -> Interacting Objects -> Specifying Electrical Circuit for First Group

We now add the remaining design attributes for our system, beginning with the specification of a group electrical circuit connecting the elements of the first group. The elements will be connected in parallel in the circuit and fed by an external current source. Edit the first group (i.e. the entry "Group of electrically energized nonmagnets") by double-clicking its entry in the System Structure list; the Group Specification dialog is displayed. Select the Electrical Circuit tab (Fig 9a). The elements of the group are represented as rectangles in the Group Circuit diagram box. By default the positive direction of current through an element is along the positive u -direction of the element. The label [1:U] for example indicates that the element bearing it is the first element of the group and that the positive current direction is along the positive u -axis.

Any two components that are to be connected to each other are arbitrarily designated as either source or destination components and corresponding areas of the window are used to specify their circuit properties. In the Group Circuit diagram box click on the first element using the left mouse button. This selects it as the destination component. Now click on the second element, using the right mouse button, to select it as the source component. A green box will surround the source component while a yellow box will surround the destination component. In the frame Connection to other components , select the entry w-Axis from the Direction of current drop-down list. This specifies the positive w -direction as the positive current flow direction for the destination component. Notice that the label for the first component in the Group circuit diagram box has now changed to express this fact.

Inside the Connection to other components frame, to the right, is a set of check boxes for accomplishing the connection of source and destination components. The straight lines connecting the check boxes provide visual guides for determining the manner of the connections between the components. Check two of the boxes as shown in Fig. 9b to accomplish the parallel connection of the components. The connections will show up as part of the circuit diagram in the Group circuit diagram box. Try out other possible connections by clicking among the check boxes to see their effects and to get a feel of how they work, and then revert back to the setting indicated in Fig. 9b.

To this initial circuit we now connect a current source . Make the second component the source component by clicking on it with the right mouse button in the Group circuit diagram box. In the Current Source frame select the Custom current profile option. Notice that the current source is now included as part of the illustration in the Group circuit diagram box. Display the dialog for specifying the current profile that will be supplied by the current source, by pressing the button with caption " ... " located to the right of the Custom current profile option. This dialog is shown in Fig. 9c. It allows the creation of a composite current profile formed from a sequence of independent current legs ( I-legs ). A full description of the dialog is available through the online help. Electrical current profile types are described in Chapters 5 and 6 of the user manual. Here we define a profile with one I-leg and describe only those actions necessary to proceed with the ongoing design. Make sure the entry Pulse Train is selected from the I-Type drop-down list, then press the Add button. Enter the following data:

Signal pattern = 1010

Max. current level (mA) = 5

Min. current level (mA) = -10

No. rise time steps = 0

No. pulse duration steps = 10

Complete the definition of the current profile by pressing the OK button. Exit the Group specification dialog by pressing its OK button. Show the defined circuit in the system-display plane as follows: Right-click the mouse in the system-display pane and from the displayed popup menu click From the main program menu select the menu item Set system display attributes->Show Electrical Circuits .

Fig. 9(c). Dialog used in defining Pulse-train electrical current profile.