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A rotor for a synchronous motor includes a permanent ring magnet which has an inner surface, and a hub which has an outer surface. The hub is provided with a rotor shaft. Each surface is formed with a plurality of teeth. The teeth formed on one surface are shaped so as to be able to engage the teeth

A rotor for a synchronous motor includes a permanent ring magnet which has an inner surface, and a hub which has an outer surface. The hub is provided with a rotor shaft. Each surface is formed with a plurality of teeth. The teeth formed on one surface are shaped so as to be able to engage the teeth formed on the other surface. The engaged teeth form a force-locking connection between the ring magnet and the hub, when the hub is pressed into the ring magnet.

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A rotor for a synchronous motor, comprising in combination a permanent ring magnet having an inner surface, a hub including a rotor shaft and having an outer surface, each surface being formed with a plurality of teeth, the teeth of one surface being engageable with the teeth of the other surface, s

A rotor for a synchronous motor, comprising in combination a permanent ring magnet having an inner surface, a hub including a rotor shaft and having an outer surface, each surface being formed with a plurality of teeth, the teeth of one surface being engageable with the teeth of the other surface, said hub being pressable into said permanent ring magnet, said teeth being shaped so that the engaged teeth form a force-locking connection between said ring magnet when said hub is pressed into said ring magnet, but gaps remain between said hub and said ring magnet which extend along a substantially radial direction, whereby a connection between said hub and said ring magnet is established, while said hub and said ring magnet remain free of being subjected to any tensile stresses along said substantially radial direction.