Magnet systems for stacking
Switchable magnet systems for stacking pieces of sheet metal
These magnet systems, comprising permanent magnets and a coil, are used in particular for transporting suspended ferromagnetic items of sheet metal. These systems can be used especially cost-effectively wherever there is at least a 50% condition of "magnetically adhering". This ensures that the switch-on period of the coil is not greater than 50%. This condition is always met for applications involving stacking systems. These systems are optimized in respect of high levels of adhesive power, a mean deep action and a low compensation current. These components effect an electrical time constant on the part of the systems of approx. 50 ms to 120 ms. It is markedly less than in the case of pure electromagnets. Given today's usual stacking speed, it is necessary to provide the magnet systems with control electronics which allow a switching frequency of up to 200 switches per minute and more. Such a high switching frequency can, however, only be realized if the falling sheet metal is subjected to an additional force so that the depositing process is accelerated such as is the case with destacking systems.
Types
» Monostable displacement systems
» Bistable switchable magnet systems
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