The invention concerns a squirrel-cage rotor for an electrical motor, with a cage of electrically well conducting rods which pass longitudinally through the bundle of laminae, the ends of the rods projecting from the lamina bundle being connected by rings. The aim of the invention is to eliminate vibration problems which may occur during operation with frequency converters. The invention enables higher natural torsional frequencies to be permitted in the rotor or the design to be made less sensitive by means of simple modifications to the cage, thus eliminating resonance effects. This is achieved by virtue of the fact that the ends of two, three or more adjacent cage rods are brought together in groups and jointed to each other by the rings. Preferred embodiments of the invention, for designs with groups of two, three and four rods, are described in the sub-claims.