| 摘要 |
A security-improved sealed electric machine includes a casing (2) housing a stator (3) and a rotor (4) supported by a rotor shaft (5) coming out from the casing (2). Between the casing (2) and the rotor shaft (5), seal rings (7) are provided for sealing the casing interior against the outer environment. Emergency seal rings (10) between the casing (2) and the rotor shaft (5) can assume a deactivated configuration during normal operation of the electric machine and an activated configuration in case of failure of the seal rings (7).
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