ELEKTRISCHE MASCHINE MIT REGELBARER DREHZAHL

摘要

The speed of a supercritically operated electric machine can be increased over a range between a first critical speed and a second critical speed. To this end, the shaft (11, 12) of the electric machine is elastically mounted on either side of the rotor (7). The flexural strength of the shaft (11, 12) between the rotor (7) and the second bearing (8) is substantially greater than in the region between the rotor (7) and the first bearing (9). As a result, the second critical speed shifts to higher speeds more readily than the first critical speed, and the difference between the first and the second critical speeds, and thus the maximum range over which the speed of the machine can be controlled, increases. The invention can be applied in supercritically operated, variable-speed electrical machines.