Suspended Magnets

> Manufacturers

> Equipment

> Components

> Liquid Line Magnets

Suspended Over-Head magnets are used in “over-the-belt” applications, to pull tramp metal from a bed of material. Two units are used for this application: Electromagnets and Permanent Magnets.

Electromagnets are generally recommended for belt widths over 4’ or with extremely high bed depths. These units utilize high current to “energize” the magnet. The magnet is cleaned by turning it off.


	Permanent magnets require no electricity. Although these units can be configured for manual cleaning, in most applications, a self-cleaning mechanism is highly recommended. Cleaning belts automatically move the tramp metal out of the magnetic field, and drop it into a chute or bin, outside the product stream.


	Examine the Differences


	Pros Can be turned on and off. Useful for cleaning the magnet without an additional device (belt, bar, etc.) Cons Heavier weight Maintenance required- oil level, oil degradation ,coil wear High operating cost (electricity) non-uniform magnetic field across width of conveyor as the coil is round. Unit must be oversize to work properly.



	Pros Lighter weight Less initial cost Almost zero operating cost Magnets lose only ½% of strength over 100 yrs Uniform magnetic field across entire width of Conveyor More flux lines agitate the material allowing for successful tramp removal Cons Auto Cleaning requires a belt or bar around the magnet


	Related to strength; electromagnets are generally used for deeper burden depths and lifting heavier weights. However, this is not always the case. Smaller (42” and below) permanent magnets tend to be stronger than smaller electros.




				To visit IMI on the Web, click on www.magnetics.com.

	> Back to Magnets > Back to main Component page

[Manufacturers] [Equipment] [Components] [Literature] [Case Histories] [About CMT] [Contact Us] 704-846-3737