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Method and apparatus for failsafe monitoring an electromotive drive

  • US 8,310,196 B2
  • Filed: 10/27/2010
  • Issued: 11/13/2012
  • Est. Priority Date: 10/10/2009
  • Status: Active Grant
First Claim
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1. A method for failsafe monitoring of a motor (10) with a three-phase control comprising the steps:

  • detecting current and voltage profiles, as provided to a motor (10) by drive electronics (12);

    determining a load speed (nL) of the motor (10) using the detected current and voltage profiles; and

    failsafe switching off of the motor (10) when the determined load speed (nL) does not correspond to a preset desired speed within a framework of preset tolerances;

    wherein the step of determining the load speed (nL) takes place by calculating an observer model with reference to the detected current profile (Imess, Ieff), to the detected voltage profile (Umess, Ueff), to a frequency (fFU, fsync) preset by the three-phase control and characteristic data of the motor (10);

    wherein the motor is an asynchronous motor and determining the load speed determination takes place with reference to the formula;

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