Siemens Aktiengesellschaft

Siemens Aktiengesell Schaft

Markus Platen

Ulrich Höhn

Rainer Eckert

Michael Zisler

Sebastian Räder

Hans-Werner Lipot

Karl-Heinz Filbry

The invention relates to a housing () for an electrical machine (), said housing comprising a housing wall () having an inner surface (). At least two cooling channels () extend inside the housing wall. A connecting deviation channel () is provided between two of the cooling channels (). The inventive housing is also provided with an inner sealing ring () applied to the inner surface (). The housing wall () comprises at least one housing recess () on the inner surface () thereof, in the region of the inner sealing ring (), such that, together with the inner sealing ring (), it forms the deviation channel ().

Housing of an electrical machine comprising cooling channels extending in a housing wall

An electric motor is equipped with an interface module, which is used to calculate the remaining service life of a bearing. The interface module can be integrated into the motor or can be fitted to the latter. The remaining service life of the bearing can be estimated from the signal of a rotary transducer and optionally a temperature sensor.

Interface module apparatus for an electrical machine, for calculating the life of a bearing

According to the method a temperature module is defined, simulating the thermal behavior in the electric motor (), based on a multi-mass model. The rotational speed (n) and the current (i) for the electric motor () are continuously recorded as input parameters for the temperature model and at least one bearing power loss and/or bearing inner temperature (TIL), corresponding to a bearing (), is continuously derived from the temperature model. A first warning signal (W) is given when a computer-determined bearing power loss exceeds a given comparative value. Furthermore, a second warning signal (W) is given when a computer-determined bearing inner ring temperature exceeds a given temperature difference (&#x394;T) from a corresponding computed bearing outer ring temperature (TAL'). The thermal behavior of non-accessible components, in particular, the bearing (), can thus advantageously be determined by mere evaluation of the current (i) and the rotational speed (n). The fitting of temperature sensors () in the electric motor () can also be avoided.

Monitoring the bearing temperature of an electrical machine

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Bad Neustadt, Germany

Markus Platen