Elevator starting torque compensation method

Abstract

The invention discloses an elevator starting torque compensation method which is used for calculating a torque value which needs to be compensated when an elevator system is started. The elevator system includes a main controller, a speed controller, a starting torque compensator, a torque controller and an executing mechanism; a computing method includes the steps that step 1, a variable is defined; step 2, a value is assigned to the variable; step 3, the variable assignment is recalculated by detecting present running speed feedback information of an elevator; step 4, a value is assigned toa torque compensation value according to a variable result; step 5, the variable value is added with 1; and step 6, the step 3 is repeated again. According to the elevator starting torque compensationmethod, calculated results are high in veracity, calculated speed is high, and the calculated performance is independent of the elevator nature.

Description

Technical field [0001] The invention designs the elevator field, and specifically relates to a method for compensating the torque required when the elevator starts. Background technique [0002] When the elevator starts, in order to make the passengers in the car feel comfortable, a proper starting torque must be applied to keep the mechanical system of the elevator balanced. Usually, the elevator control system obtains information from the weight sensor and calculates the required starting torque. However, in the following cases, the starting torque value requires additional compensation: [0003] Case 1: The output information of the weight sensor is biased, which results in a deviation in the calculation result of the starting torque. [0004] Case 2: In order to reduce costs or simplify elevator installation, debugging, and maintenance workload considerations, some elevators do not have weight sensors, but only have switch-type sensors for specific loads in the car (such as ove...

AI Technical Summary

Problems solved by technology

[0010] Defect 1. The limited precision of the sampling signal significantly affects the correctness and accuracy of the calculation results

For example: when just starting, the moving speed of the elevator is very slow, so that it is much smaller than the resolution of the speed feedback value; so the relative accuracy of the speed feedback value is very low, resulting in the final calculated torque compensation value significantly deviating from the actual required value

[0011] Defect 2: Calculation speed is relatively slow

[0012] Defect 3. Computing performance is sensitive to the nature of each elevator

For example, for multiple elevators of the same specification, due to different installation conditions, some elevator mechanical systems have a larger friction coefficient, while others have a smaller friction coefficient; or, due to the discreteness of the accessories, some elevator brakes open faster, Some elevator brakes open slowly

[0013] For speed closed-loop regulators, small differences in properties such as elevators can lead to significant changes in control dynamics (i.e., rapidity and stability) due to the use of very large gains and very small sampling, operation periods

Therefore, it is necessary to adjust and set specific parameters such as gain, sampling period, and calculation period for each elevator (even if it is of the same specification); thus, on-site debugging and maintenance work become very cumbersome

[0014] For the observer, however, the accuracy of its calculations strongly depends on the accuracy of the physical model; thus small differences in the properties of the elevators will lead to significant deviations in the estimates

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