Eriez has
released a new brochure entitled, "How to Choose & Use Lifting Magnets." The
brochure details various factors of lifting magnets, including construction of
lifting magnets, weight, shape and area of the load, surface condition,
stiffness, flexibility and others.
Lifting magnets may be electro or permanent and may be installed and used as single magnets or as arrangements of multiple magnets. In all of these cases, making an optimum selection of lifting magnet components to handle steel plate and shapes requires a thorough knowledge of the application.
The factors that dominate the lifting magnet selection for any specific application are weight, shape and contact area of the objects to be lifted, surface conditions of load and magnet, stiffness of load, range of sizes and shapes to be lifted, frequency of occurrence of the different sizes and shapes, adjustment of lifting power for less than full magnet face utilization, temperature of load material, ambient temperature and consideration of each of these factors will lead to identification of the magnet type, shape, number and face contour best suited for economy, efficiency and safety.
Lifting magnets fall into two general shape classifications: round and rectangular. The round lifting magnet is built with a center pole (or core) and a round outer pole concentric with the center pole. This magnet can be either permanent or electro.
The round electro lifting magnet is most efficient when considering its face area as related to lift power. Because the outer pole is a consistent distance from the core or center pole, the result is a uniform magnetic strength over the magnet face area. Black iron pipe or steel tubing is used for outer poles of round lifting magnets, and hot rolled steel round bar stock is used for the center core of round electromagnets.
The rectangular lifting magnet is built with either of two basic magnetic circuits, the two-pole or three-pole circuit, and it also can be permanent or electro.
Pole plate and core material will be hot rolled steel or low carbon steel. For the plates of rectangular lift magnets hot rolled steel plate is welded and joined into the required box shape. Using these stock materials, there is no limitation to lift magnet geometry, but round and rectangular lift magnets will usually prove adaptable to almost any lifting application.
For more information contact:
Eriez
2200 Asbury Road
Erie, PA 16506
888-300-ERIEZ (3743)
814-835-6000