The invention discloses an overspeed protection system and method for a crane. According to the overspeed protection system and method for the crane, the reliability is high, and the operation safety of the crane can be guaranteed. The system comprises a detecting unit, a rotation speed estimating unit, a judging unit and a controlling unit. The detecting unit is used for detecting specified parameters on the motor stator side of the crane. The rotation speed estimating unit is used for estimating the rotation speed of a motor stator through a preset rotation speed estimating algorithm based on the specified parameters, detected by the detecting unit, on the motor stator side. The judging unit is used for determining whether a motor rotor rotates over the speed limit according to the rotation speed, estimated by the rotation speed estimating unit, of the motor rotor and an overspeed protection threshold. The controlling unit is used for performing overspeed protection when the judging unit determines that the motor rotor rotates over the speed limit.
Overspeed protection system and method for crane
2015-12-09
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
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