ELEVATING DEVICE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To control drive equipment while estimating a heat temperature with an actual heat-generation state accurately reflected therein without requiring an additional component for directly detecting a temperature of a thermistor or the like.

SOLUTION: Rise of temperature is calculated on the basis of a current conduction time and a temperature rise gradient with respect to each current value corresponding to a load when an elevating member 2 is moved by energizing drive equipment 1. Decrease of temperature is calculated on the basis of an energization stop time and a temperature fall gradient when energization is stopped after the temperature rise. Changes in heat temperature of the drive equipment 1 are estimated while repeating addition of an amount equivalent to the increase of the temperature during energization and subtraction of an amount equivalent to the decrease of the temperature when energization is stopped by repeating energization and an energization stop. When an estimated heat temperature of the drive equipment 1 estimated by a heat temperature estimation part 5 reaches a preset threshold, it is controlled so as to stop energization to the drive equipment 1.

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