Kommutatoren & Schleifringkörper Finsterwalde GmbH


Frequently asked questions and answers

Here you can find questions frequently put to us and their answers.

The commutator is an important component in the construction of DC motors. Its task is to supply the rotating armature (rotor) with current in such a way that the it flows through the individual windings at the right moment and in the direction of the current, so that, according to the Lenz’s Law of Induction, the rotor moves in the intended direction.

In terms of construction, this involves a rotationally symmetrical body comprising of electrically conductive single segments (copper) according to the number of windings of the rotor. These are, in turn, electrically isolated from each other by means of mica sheets. The individual parts are joined with a duroplast moulded compound in the transfer moulding process.

The commutator is mounted immediately adjacent to the winding on the rotor shaft and the ends of the windings are each interconnected with two staggered commutator segments (winding step). The transfer of the current to the rotating commutator is executed via carbon brushes.

In terms of construction, the design and manufacturing quality of the commutator must ensure that it is able, as a composite body, to withstand the high centrifugal forces during the rotation and transfer the required strength of current below the given armature voltage without having this leading to unwanted short circuits.

Slip ring bodies are also components of electric drives. They are used in generators to transfer the inductively generated current from the rotating armature of a generator for further use. The range of applications ranges from portable emergency generators wind power generators to power station machinery.

A further area of application is the transfer of the required drive power on slip ring motors. These are motors that can generate very high torques and are used, for example, in mills and cement plants.

A special application for slip ring bodies is their use in frequency converters.

Furthermore, slip ring bodies can be used anywhere where current needs to be transferred to the various drive and switching functions between rotating and stationary modules.

Slip ring bodies are rotationally symmetrical components, in which the current is transferred during the rotation via carbon brushes on rings made of conductive material (tin bronze, steel, etc.). The rings are pressed in a duroplastic moulding compound and are therefore electrically insulated from each other and from the rotor shaft. Larger slip ring bodies (diameters of over 400 mm) are manufactured in screw designs whereby the slip rings are safeguarded against electrical short circuits by means of special insulation elements. Connection elements (rails, threaded studs etc.) are found on the slip rings for interconnection with the armature winding.

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