METHOD FOR CONTROLLING THE NORMAL FORCE OF A TRANSPORT UNIT OF A LONG STATOR LINEAR MOTOR

摘要

In order to reduce the mechanical loading due to the guidance of the transportunit of a conveyorinstallation in the form of a long stator linear motor and nevertheless ensuresafe retentionof the transport unit on the conveyor track of the conveyor installation inall operatingconditions, it is provided that the normal force (F Nn) is controlled with acontroller (Rk) for controllingthe normal force (F Nn), wherein the controller (Rk) determines a normal-force-formingcurrent component (i And) of the drive current (i An) of the drive coils (7,8) interacting with thetransport unit (Tn) so that a resulting normal force (F.SIGMA.Nn) acting onthe transport unit (Tn) asthe sum of the normal force (F Nn), a magnetic force (F En) in the normaldirection (N) causedby the drive magnets (4, 5), and an external force (F En) in the normaldirection (N) acting onthe transport unit (Tn) corresponds at least to a specified retaining force (FNnmin) in the normaldirection (N).