Control method for preventing hook from slipping when electric hoist stops
The technology of an electric hoist and a control method, which is applied in the direction of the clockwork mechanism and hoisting device, can solve the problems of reducing the accuracy of heavy objects, safety problems, and hindering the action of the brake, so as to prevent the phenomenon of hook slipping and improve the accuracy. The effect of improving the safety of use
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[0017] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0018] The electric hoist control structure of the present invention is as figure 1 As shown, the electric hoist is driven by a conical motor, and the control system of the conical motor includes a frequency converter with an inverter unit and a control unit (the part in the dotted line box in the figure), and the control unit includes a flux controller and a torque / torque current controller; the conical motor includes an electromagnetic brake device. The grid power is connected to the frequency converter, and the inverter control unit gives PWM pulse signals to control the inverter unit of the frequency converter to turn on and off, and the control voltage output by the inverter unit of the frequency converter controls the power supply voltage of the cone motor electric hoist. The frequency converter should realize the power-off control of the conical...
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