Slide speed control method of elevator based on permanent magnet synchronous motor

Abstract

The invention discloses a slide speed control method of an elevator based on a permanent magnet synchronous motor. When an emergency occurs, the elevator slides for a while after a band-type brake is opened, the rotation direction, and the rotation speed and the current effective value of the permanent magnet synchronous motor are obtained through detection; when the current effective value is smaller than or equal to 1 / 20 of rated current, the slide speed is too high, and a super-capacitor supplies electricity to the permanent magnet synchronous motor and drags a lift car to a flat bed through opening loop V / F control; when the current effective value is larger than 1 / 20 of the rated current, the super-capacitor does not supply electricity, adjusts the dead time through PWM control and increases the slide speed of the lift car, and when the real-time rotation speed of the permanent magnet synchronous motor reaches a given range, the dead time keeps unchanged until the lift car slides to the flat bed, and finally people can go out after the lift car reaches the flat bed. By means of the slide speed control method of the elevator based on the permanent magnet synchronous motor, the slide speed of the lift car is high, the time for sliding to the flat bed is largely shortened, the consumed electricity is low, and therefore the requirement for capacity configuration of the super-capacitor is lowered.

Description

technical field [0001] The invention relates to a method for controlling the rolling speed of an elevator in emergency rescue, in particular to a method for controlling the rolling speed of an elevator based on a permanent magnet synchronous motor. Background technique [0002] Existing elevators are all equipped with elevator emergency circuit equipment and corresponding methods, which are used to ensure the completion of elevator emergency rescue in case of emergency, so that the life safety of elevator passengers is guaranteed. [0003] Among them, for low-speed elevators driven by permanent magnet synchronous motors, emergency rescue is generally accomplished by sliding the car to the leveling position to release people. In the above-mentioned elevator with the storage battery as the energy storage element, the three-phase lower bridge of the frequency converter is used to achieve the effect of sealing the motor core, so that the car can slide slowly to the leveling floo...

AI Technical Summary

Problems solved by technology

In the above-mentioned elevator with the storage battery as the energy storage element, the three-phase lower bridge of the frequency converter is used to achieve the effect of sealing the motor core, so that the car can slide slowly to the leveling floor, such as the Chinese invention patent application with the publication number CN101780906A " Elevator Emergency Operation Adaptive Control Method", under this control method, the sliding speed is generally lower than 0.05 m / s, and it takes at least 1 minute to complete a rescue, which means that a large amount of power is consumed

However, in the above-mentioned elevators that use supercapacitors as energy storage components, due to cost issues, they cannot be equipped with capacitors with a capacity similar to that of batteries, and the capacity of the capacitors is limited. Therefore, the rescue must be completed as soon as possible.

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