×

METHOD AND APPARATUS FOR FAILSAFE MONITORING AN ELECTROMOTIVE DRIVE

  • US 20110084642A1
  • Filed: 10/27/2010
  • Published: 04/14/2011
  • Est. Priority Date: 10/10/2009
  • Status: Active Grant
First Claim
Patent Images

1. A method for failsafe monitoring of an electromagnetic drive (10) with a three-phase control comprising the steps:

  • 1) detecting the current and voltage profiles, as they are provided to the motor (10) by drive electronics (12);

         2) determining the load speed (nL) while using these values;

         3) failsafe switching off of the drive (10) when the calculated load speed (nL) does not correspond to a preset desired speed within the framework of preset tolerances, characterized in that the step of determining the load speed (nL) takes place by calculating an observer model with reference to the detected current (Imess, Ieff), to the detected voltage (Umess, Ueff), to the frequency (fFU, fsync) preset by the control and to the characteristic data of the motor (10).

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×