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Control method for preventing hook from slipping when electric hoist stops

A technology of electric hoist and control method, which is applied in the direction of spring mechanism, hoisting device, etc., which can solve the problems of safety, reduce the accuracy of heavy objects, and hinder the brake action of the brake, so as to improve the accuracy and prevent the hook from slipping Phenomenon, the effect of improving the safety of use

Active Publication Date: 2012-01-18
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps control an AC induction machine by removing any magnetic material from its rotor after turning on again for better performance or efficiency during operation. It also prevents damage caused when lifting weights with high-powered motors due to excessive force being applied through them.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the performance and efficiency of frequency converter systems used in elevators during lifts operations without causing any issues such as sliplockings caused by excessive magnetic forces generated by permanent wires inside the system's inductor cores.

Method used

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  • Control method for preventing hook from slipping when electric hoist stops
  • Control method for preventing hook from slipping when electric hoist stops
  • Control method for preventing hook from slipping when electric hoist stops

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Embodiment Construction

[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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Abstract

The invention discloses a control method for preventing a hook from slipping when an electric hoist stops. The electric hoist is driven by a tapered motor, a control system of the tapered motor is a frequency converter comprising an inversion unit and a control unit, and the control unit comprises a magnetic chain controller and a torque/torque current controller. The tapered motor also comprisesan electromagnetic contacting brake device. The control unit controls the inversion unit to stop output, so that the control unit controls the inversion unit to carry out demagnetization processing on the tapered motor after the tapered motor is powered off. With the control method, remanent magnet in the tapered motor is reduced to a degree that the action of the electromagnetic contacting brakedevice in the tapered motor cannot be hindered, the hook slip phenomena of the electric hoist can be effectively avoided, the locating accuracy of heavy objects in the air is improved during the use of the electric hoist, the standard requirements of the electric hoist industry are met, and the use safety is improved.

Description

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Claims

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Application Information

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Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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