The invention discloses an eddy current braking system of a tower crane swing mechanism. The eddy current braking system comprises an alternating-current input source, a controlled rectifier circuit, a control unit, an alternating-current input sampling circuit and a controlled rectifier driving circuit, wherein the controlled rectifier circuit is connected between the alternating-current input source and an eddy current coil; the control unit is connected with a master controller of a tower crane; the alternating-current input sampling circuit is connected between the control unit and the alternating-current input source; the controlled rectifier driving circuit is connected between the control unit and the controlled rectifier circuit; the controlled rectifier driving circuit is used for driving the controlled rectifier circuit according to PWM (Pulse-Width Modulation) sent by the control unit; the control unit is used for calculating the PWM according to a swing speed gear given by the master controller and the alternating-current input voltage and phase which are sampled by the alternating-current input sampling circuit, so as to buffer impact generated when the tower crane is subject to gear shifting and achieve optimal operating and braking effects.
Eddy current braking system of tower crane swing mechanism
2015-07-29
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
Tower crane rotation braking method and device and tower crane comprising device
European Patent Office | 2022
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