Abstract: For electric motor collectors with lamella inner cross members, which serve for anchoring the individual lamellas, protrude inwards running at least predominantly parallel to the collector axis and are provided with undercut surfaces, which are to be grasped from behind by reinforcing rings. Reinforcing rings are proposed which, aside from a metallic clamping ring, comprise a supporting ring, which is fitted positively into the metallic clamping ring and forms a double body with the clamping ring and is formed from a material, which is resistant to compression and insulating even at high operating temperatures. With this, reinforcing rings are produced from two partial rings, which are easily manufactured and easy to press together, or by the supporting ring which is brought into the clamping ring by injection molding. The reinforcing rings form a unit which can withstand extremely high thermal and mechanical stresses and imparts the collector with very high stability under load and fatigue endurance.

Abstract: A collector for an electric motor or generator with lamellae, which are distributed symmetrically to a collector axis at the periphery or at a front face and which are embedded in a basic body of insulating material, the collector having a central opening, which is designed with respect to its diameter for a press fit on the shaft of the electric motor or generator and is reinforced by a bushing element of higher strength for absorbing the seating and pressing-on forces, is designed in the sense of being easier and less expensive to manufacture, being handled more readily and less critically while being pressed onto the shaft of a motor and being more robust and having a longer service life, so that the busing element has an internal diameter, which is larger than the diameter of the opening, and that the bushing element is covered on the inside by a layer of insulating material.