A system and method for detecting a brake dragging during normal operation of a motor monitors torque at zero speed and at constant speed. For an inertial system acted upon by gravity, a value of torque required to maintain zero speed is approximately the same as a value of torque required to maintain operation at a constant speed. In an exemplary, elevator system, a motor drive determines the torque required to maintain zero speed operation of an elevator cab after a holding brake opens and before it begins controlling the motor to rotate. The motor drive again determines the torque required to maintain a constant speed and compares this value to the value of torque required to maintain zero speed. If the difference between the two values of torque is greater than a predefined threshold, then the motor drive determines that the brake is dragging and sets an error message.
SYSTEM AND METHOD OF DETECTING A DRAGGING BRAKE IN AN ELEVATOR APPLICATION
SYSTEM UND VERFAHREN ZUR ERKENNUNG EINER SCHLEPPBREMSE IN EINER AUFZUGSANWENDUNG
SYSTÈME ET PROCÉDÉ DE DÉTECTION D'UNE PIÈCE DE FREIN TRAÎNANTE DANS UNE APPLICATION D'ASCENSEUR
26.03.2025
Patent
Elektronische Ressource
Englisch
IPC: | B66B Aufzüge , ELEVATORS |
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