The norm is to pull the armature up, but extending the side of the armature close to the stationary core with a pushrod results in the field pushing the armature down. The magnetic field induces a force on the armature that either pulls it up or pushes it down. In other words, the core acts as a closed path that confines the magnetic field. The core works as a magnetic circuit for the magnetic field.
The strength of the field is directly proportional to the current, the number of windings, and the permeability of the stationary core's ferromagnetic material. Figure 2: A diagram of a solenoid coil: coil (A), stationary core (B), shading ring (C), spring (D), and armature (E).Īs seen in Figure 2, solenoid parts are the following:
