Question

when metal plate is held between a magnet then direction of eddy current changes at two extreme positions???​

Answer 1

Answer:

Eddy current separators are used to separate non-ferrous metals from waste and automobile shredder residue. The process generally follows the primary magnetic separation process. The process exploite the electrical conductivity of non-magnetic metals. This is achieved by passing a magnetic current through the feed stream and using repulsive forces interacting between a magnetic field and the eddy currents in the metals.

The simplest device following this principle is the inclined ramp separator. This uses a series of magnets on a sloped plate covered with a non-magnetic sliding surface like stainless steel. When a feed of mixed material is fed down the ramp, non-metals slide straight down, while metals are deflected sideways by the interaction of the magnetic field and the induced eddy current. The two streams are then collected separately.

There are several variations of the eddy current separator. These include the rotating disc separator where the magnets are arranged around a axis. Another system uses a conveyor with a head pulley fitted with magnets. Both system relies on the varying trajectories of materials either affected or unaffected by the magnetic fields, to make the separation. (See Chapter 3 for discussion of eddy current technique).