Control method for preventing hook from slipping when electric hoist stops

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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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.

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