H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 7/09 (2006.01) H02H 7/085 (2006.01) H02H 7/093 (2006.01)
Patent
CA 2248740
The present invention relates to a procedure and a circuit for identifying and switching of a permanently excited DC motor that is either jammed or overloaded. After the motor (M) has been switched on by way of a motor relay (MR) the motor (M) is switched off through the motor relay (MR) after a defined run-up time (T r). A generator voltage is measured at the terminals of the motor (M) and then compared with a defined threshold value (U ref). In the event that the generator voltage (U G) exceeds the threshold value (U ref) the motor (M) is switched on once again.
La présente invention fait état d'un procédé et d'un circuit de détection et de mise hors tension d'un moteur à courant continu en état d'excitation permanente, qui est soit bloqué ou surchargé. Une fois que le moteur (M) a été mis sous tension au moyen d'un relais de commande de moteur (MR), le moteur (M) est mis hors tension au moyen du relais de commande de moteur (MR) à la suite d'un intervalle de garde préétabli (Tr). Une tension génératrice est mesurée aux bornes du moteur (M) et comparée à une valeur de seuil (U ref). Lorsque la tension génératrice (UG) dépasse la valeur de seuil (U ref), le moteur (M) est de nouveau mis sous tension.
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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