Solenoid with Magnetic Blocks

This example shows how to model a solenoid with spring return. When unpowered, the spring pulls the plunger +5mm away from the center of the coil. Turning on the power supply at t=0.1 seconds pulls the plunger into the center of the coil. At t=0.3s, a 10N external load is added to the plunger.

This model is similar to the example model ssc_solenoid, except the solenoid here is modeled using magnetic blocks rather than physical signal blocks. The current through the solenoid produces a magnetomotive force (mmf) which drives a flux through the magnetic core of the solenoid. A reluctance force is produced which drives the plunger to close the air gap, initially 5mm in length. The flux in the magnetic core increases as the air gap length decreases.