Method and system for controlling dynamic overload automatic load reduction of motor driving

Abstract

The invention discloses a method and a system for controlling dynamic overload automatic load reduction of motor driving. The method comprises the steps of acquiring a rated value of a physical variable used for describing motor driving overload, an overload multiple, the overload time, an actual measurement value and the motor running time; determining an overload accumulative threshold value of the physical variable according to the acquired rated value, the overload multiple and the overload time, and determining an overload accumulative value of the physical variable according to the acquired rated value, the actual measurement value and the motor running time; carrying out closed-loop adjustment on the physical variable when the overload accumulative value is greater than the overload threshold value so as to enable a current actual measurement value to be less than or equal to the rated value. According to the invention, automatic load reduction in motor driving overload is realized, thereby avoiding a circumstance of equipment downtime or damages caused by motor dynamic overload.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to a control method and system for dynamic overload automatic load reduction of motor drive. Background technique [0002] Both the motor and the driver have a rated load power. If the actual power of the motor exceeds the rated power of the motor under certain circumstances, this phenomenon is called motor overload. At present, in the fields of electric vehicle drive, frequency converter drive, AC servo drive, elevator drive and other fields, after the motor overload occurs, for the sake of safety, in order to protect the motor and related electrical equipment, the drive will generally perform protection alarm and stop processing. Cause the stagnation of user's use, and bring inconvenience. For example, in the application of a dynamic platform, when the change rate of the motion control command is large, the motor drive is prone to short-term dynamic overload shutdown protection...

AI Technical Summary

Problems solved by technology

However, this leads to an undesirable situation of increased cost and reduced performance of the motor and drive

In addition, because the current general driver does not have the function of automatic overload reduction, in the application of dynamic servo platforms and other equipment, users need to repeatedly try smoothing filtering methods or parameters such as acceleration and deceleration of control commands, which brings a lot of inconvenience or unnecessary additional hardware and time costs

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