Electrical Engineering ⇒ Topic : Practical Magnetic Circuits

PRACTICAL MAGNETIC CIRCUITS

They are of the following types: (i) core type, (ii) shell type, (iii) relays, and (iv) clutches.

In core type Figure (a), the windings are on the two sides of a rectangular core and the total m.m.f. is the sum of that of the four sides.

The shell type Figure (b) is like a window pane. The windings are mounted on the central side. The central side carries the total flux and the extreme sides carry half of the flux.

                                                   Figure (a) Core type.

                                                         figure (b) Shell type.

                                                            figure (c) Relay

There will be an air gap between the core and armature for flux lines to complete the circuit as shown in Figure (c). It is an example of relay.