Umforder

UMFORDER, or rotating converter, is an instrument serving to convert alternating current into direct current or vice versa (the former purpose is applied more often). The U. represents a connection of an alternating current motor and a direct current dynamo, which it sets in motion. The principle of the direct current dynamo is as follows: between stationary magnets (called the inductor) in their magnetic field rotates a system of conductors, wound like coils on a hollow iron cylinder, the axis of which is perpendicular to the magnetic lines of the magnets. The action is based on the phenomenon of electromagnetic induction, which is obtained when conductors move in a magnetic field. The current is taken not directly from the turns of the armature, but from the collector, which represents a hollow cylinder mounted on the armature but insulated from it and consisting of copper plates insulated from each other by mica spacers. Each collector plate is connected to a section of the armature windings. The U. usually produce significant fluctuations in direct current voltage, therefore for precise measurements they are often connected to a regulator. In recent years, U. have appeared in which both the motor and the generator are placed in one aggregate. The U. is applied in medicine in pantostats in those cases when the latter are fed by alternating current.

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