Frag Electro Drum Magnets

The design of the FED features one single main coil that stretches the full width of the drum. This produces an alternating polarity along with a single auxiliary coil. This design is best suited to situations where magnetic materials may be burying or entrapping non-magnetic materials. FED Frag Drums are designed so that extracted magnetic materials roll over the face of the drum. This releases any non-magnetic materials that may be caught between ferrous material and the magnet’s face.

The design has asymmetric bipolar coils that consist of a main coil. This main coil concentrates maximum flux at the point of extraction. Then, a secondary coil works to ensure that ferrous material is carried around the drum and reaches its appropriate discharge point.

The magnetic field here alternates—this “flips” the magnetic material while it is traveling around the drum. By doing this, stray non-magnetic particles fall or are removed from the product stream. This produces a cleaner magnet product.

The coils are ducted between the core and the coil, as well as between the coils themselves. This maximizes the heat dissipation of the coil and results in a higher efficiency magnet. This coiling system also minimizes the gradient from any surface, which results in significantly reduced hot spot temperatures.